恢复SQL Server被误删除的数据
恢复SQL Server被误删除的数据
地址：http://www.cnblogs.com/lyhabc/p/4620764.html
曾经想实现Log Explorer for SQL Server的功能，利用ldf里面的日志来还原误删除的数据
这里有一篇文章做到了，不过似乎不是所有的数据类型都支持
以下为译文：http://raresql.com/2011/10/22/how-to-recover-deleted-data-from-sql-sever/
在我使用SQLSERVER的这些年里面，大部分人都会问我一个问题：“能不能恢复被删除的数据？？”
现在，从SQLSERVER2005 或以上版本能很容易能够恢复被删除的数据
（注意：这个脚本能恢复下面的数据类型的数据 而且兼容CS 排序规则）
- image
- text
- uniqueidentifier
- tinyint
- smallint
- int
- smalldatetime
- real
- money
- datetime
- float
- sql_variant
- ntext
- bit
- decimal
- numeric
- smallmoney
- bigint
- varbinary
- varchar
- binary
- char
- timestamp
- nvarchar
- nchar
- xml
- sysname
让我来用demo来解释一下我是怎么做到的
USE master GO --创建数据库 CREATE DATABASE test GO USE [test] GO --创建表 CREATE TABLE [dbo].[aa]( [id] [int] IDENTITY(1,1) NOT NULL, [NAME] [nvarchar](200) NULL ) ON [PRIMARY] GO --插入测试数据 INSERT [dbo].[aa] ( [NAME] ) SELECT '你好' GO --删除数据 Delete from aa Go --验证数据是否已经删除 Select * from aa Go
现在你需要创建一个存储过程来恢复你的数据
-- Script Name: Recover_Deleted_Data_Proc -- Script Type : Recovery Procedure -- Develop By: Muhammad Imran -- Date Created: 15 Oct 2011 -- Modify Date: 22 Aug 2012 -- Version : 3.1 -- Notes : Included BLOB data types for recovery.& Compatibile with Default , CS collation , Arabic_CI_AS. CREATE PROCEDURE Recover_Deleted_Data_Proc @Database_Name NVARCHAR(MAX) , @SchemaName_n_TableName NVARCHAR(MAX) , @Date_From DATETIME = '1900/01/01' , @Date_To DATETIME = '9999/12/31' AS DECLARE @RowLogContents VARBINARY(8000) DECLARE @TransactionID NVARCHAR(MAX) DECLARE @AllocUnitID BIGINT DECLARE @AllocUnitName NVARCHAR(MAX) DECLARE @SQL NVARCHAR(MAX) DECLARE @Compatibility_Level INT SELECT @Compatibility_Level = dtb.compatibility_level FROM master.sys.databases AS dtb WHERE dtb.name = @Database_Name IF ISNULL(@Compatibility_Level, 0) <= 80 BEGIN RAISERROR('The compatibility level should be equal to or greater SQL SERVER 2005 (90)',16,1) RETURN END IF ( SELECT COUNT(*) FROM INFORMATION_SCHEMA.TABLES WHERE [TABLE_SCHEMA] + '.' + [TABLE_NAME] = @SchemaName_n_TableName ) = 0 BEGIN RAISERROR('Could not found the table in the defined database',16,1) RETURN END DECLARE @bitTable TABLE ( [ID] INT , [Bitvalue] INT ) --Create table to set the bit position of one byte. INSERT INTO @bitTable SELECT 0 , 2 UNION ALL SELECT 1 , 2 UNION ALL SELECT 2 , 4 UNION ALL SELECT 3 , 8 UNION ALL SELECT 4 , 16 UNION ALL SELECT 5 , 32 UNION ALL SELECT 6 , 64 UNION ALL SELECT 7 , 128 --Create table to collect the row data. DECLARE @DeletedRecords TABLE ( [Row ID] INT IDENTITY(1, 1) , [RowLogContents] VARBINARY(8000) , [AllocUnitID] BIGINT , [Transaction ID] NVARCHAR(MAX) , [FixedLengthData] SMALLINT , [TotalNoOfCols] SMALLINT , [NullBitMapLength] SMALLINT , [NullBytes] VARBINARY(8000) , [TotalNoofVarCols] SMALLINT , [ColumnOffsetArray] VARBINARY(8000) , [VarColumnStart] SMALLINT , [Slot ID] INT , [NullBitMap] VARCHAR(MAX) ) --Create a common table expression to get all the row data plus how many bytes we have for each row. ; WITH RowData AS ( SELECT [RowLog Contents 0] AS [RowLogContents] , [AllocUnitID] AS [AllocUnitID] , [Transaction ID] AS [Transaction ID] --[Fixed Length Data] = Substring (RowLog content 0, Status Bit A+ Status Bit B + 1,2 bytes) , CONVERT(SMALLINT, CONVERT(BINARY(2), REVERSE(SUBSTRING([RowLog Contents 0], 2 + 1, 2)))) AS [FixedLengthData] --@FixedLengthData -- [TotalnoOfCols] = Substring (RowLog content 0, [Fixed Length Data] + 1,2 bytes) , CONVERT(INT, CONVERT(BINARY(2), REVERSE(SUBSTRING([RowLog Contents 0], CONVERT(SMALLINT, CONVERT(BINARY(2), REVERSE(SUBSTRING([RowLog Contents 0], 2 + 1, 2)))) + 1, 2)))) AS [TotalNoOfCols] --[NullBitMapLength]=ceiling([Total No of Columns] /8.0) , CONVERT(INT, CEILING(CONVERT(INT, CONVERT(BINARY(2), REVERSE(SUBSTRING([RowLog Contents 0], CONVERT(SMALLINT, CONVERT(BINARY(2), REVERSE(SUBSTRING([RowLog Contents 0], 2 + 1, 2)))) + 1, 2)))) / 8.0)) AS [NullBitMapLength] --[Null Bytes] = Substring (RowLog content 0, Status Bit A+ Status Bit B + [Fixed Length Data] +1, [NullBitMapLength] ) , SUBSTRING([RowLog Contents 0], CONVERT(SMALLINT, CONVERT(BINARY(2), REVERSE(SUBSTRING([RowLog Contents 0], 2 + 1, 2)))) + 3, CONVERT(INT, CEILING(CONVERT(INT, CONVERT(BINARY(2), REVERSE(SUBSTRING([RowLog Contents 0], CONVERT(SMALLINT, CONVERT(BINARY(2), REVERSE(SUBSTRING([RowLog Contents 0], 2 + 1, 2)))) + 1, 2)))) / 8.0))) AS [NullBytes] --[TotalNoofVarCols] = Substring (RowLog content 0, Status Bit A+ Status Bit B + [Fixed Length Data] +1, [Null Bitmap length] + 2 ) , ( CASE WHEN SUBSTRING([RowLog Contents 0], 1, 1) IN ( 0x10, 0x30, 0x70 ) THEN CONVERT(INT, CONVERT(BINARY(2), REVERSE(SUBSTRING([RowLog Contents 0], CONVERT(SMALLINT, CONVERT(BINARY(2), REVERSE(SUBSTRING([RowLog Contents 0], 2 + 1, 2)))) + 3 + CONVERT(INT, CEILING(CONVERT(INT, CONVERT(BINARY(2), REVERSE(SUBSTRING([RowLog Contents 0], CONVERT(SMALLINT, CONVERT(BINARY(2), REVERSE(SUBSTRING([RowLog Contents 0], 2 + 1, 2)))) + 1, 2)))) / 8.0)), 2)))) ELSE NULL END ) AS [TotalNoofVarCols] --[ColumnOffsetArray]= Substring (RowLog content 0, Status Bit A+ Status Bit B + [Fixed Length Data] +1, [Null Bitmap length] + 2 , [TotalNoofVarCols]*2 ) , ( CASE WHEN SUBSTRING([RowLog Contents 0], 1, 1) IN ( 0x10, 0x30, 0x70 ) THEN SUBSTRING([RowLog Contents 0], CONVERT(SMALLINT, CONVERT(BINARY(2), REVERSE(SUBSTRING([RowLog Contents 0], 2 + 1, 2)))) + 3 + CONVERT(INT, CEILING(CONVERT(INT, CONVERT(BINARY(2), REVERSE(SUBSTRING([RowLog Contents 0], CONVERT(SMALLINT, CONVERT(BINARY(2), REVERSE(SUBSTRING([RowLog Contents 0], 2 + 1, 2)))) + 1, 2)))) / 8.0)) + 2, ( CASE WHEN SUBSTRING([RowLog Contents 0], 1, 1) IN ( 0x10, 0x30, 0x70 ) THEN CONVERT(INT, CONVERT(BINARY(2), REVERSE(SUBSTRING([RowLog Contents 0], CONVERT(SMALLINT, CONVERT(BINARY(2), REVERSE(SUBSTRING([RowLog Contents 0], 2 + 1, 2)))) + 3 + CONVERT(INT, CEILING(CONVERT(INT, CONVERT(BINARY(2), REVERSE(SUBSTRING([RowLog Contents 0], CONVERT(SMALLINT, CONVERT(BINARY(2), REVERSE(SUBSTRING([RowLog Contents 0], 2 + 1, 2)))) + 1, 2)))) / 8.0)), 2)))) ELSE NULL END ) * 2) ELSE NULL END ) AS [ColumnOffsetArray] -- Variable column Start = Status Bit A+ Status Bit B + [Fixed Length Data] + [Null Bitmap length] + 2+([TotalNoofVarCols]*2) , CASE WHEN SUBSTRING([RowLog Contents 0], 1, 1) IN ( 0x10, 0x30, 0x70 ) THEN ( CONVERT(SMALLINT, CONVERT(BINARY(2), REVERSE(SUBSTRING([RowLog Contents 0], 2 + 1, 2)))) + 4 + CONVERT(INT, CEILING(CONVERT(INT, CONVERT(BINARY(2), REVERSE(SUBSTRING([RowLog Contents 0], CONVERT(SMALLINT, CONVERT(BINARY(2), REVERSE(SUBSTRING([RowLog Contents 0], 2 + 1, 2)))) + 1, 2)))) / 8.0)) + ( ( CASE WHEN SUBSTRING([RowLog Contents 0], 1, 1) IN ( 0x10, 0x30, 0x70 ) THEN CONVERT(INT, CONVERT(BINARY(2), REVERSE(SUBSTRING([RowLog Contents 0], CONVERT(SMALLINT, CONVERT(BINARY(2), REVERSE(SUBSTRING([RowLog Contents 0], 2 + 1, 2)))) + 3 + CONVERT(INT, CEILING(CONVERT(INT, CONVERT(BINARY(2), REVERSE(SUBSTRING([RowLog Contents 0], CONVERT(SMALLINT, CONVERT(BINARY(2), REVERSE(SUBSTRING([RowLog Contents 0], 2 + 1, 2)))) + 1, 2)))) / 8.0)), 2)))) ELSE NULL END ) * 2 ) ) ELSE NULL END AS [VarColumnStart] , [Slot ID] FROM sys.fn_dblog(NULL, NULL) WHERE AllocUnitId IN ( SELECT [Allocation_unit_id] FROM sys.allocation_units allocunits INNER JOIN sys.partitions partitions ON ( allocunits.type IN ( 1, 3 ) AND partitions.hobt_id = allocunits.container_id ) OR ( allocunits.type = 2 AND partitions.partition_id = allocunits.container_id ) WHERE object_id = OBJECT_ID('' + @SchemaName_n_TableName + '') ) AND Context IN ( 'LCX_MARK_AS_GHOST', 'LCX_HEAP' ) AND Operation IN ( 'LOP_DELETE_ROWS' ) AND SUBSTRING([RowLog Contents 0], 1, 1) IN ( 0x10, 0x30, 0x70 ) /*Use this subquery to filter the date*/ AND [TRANSACTION ID] IN ( SELECT DISTINCT [TRANSACTION ID] FROM sys.fn_dblog(NULL, NULL) WHERE Context IN ( 'LCX_NULL' ) AND Operation IN ( 'LOP_BEGIN_XACT' ) AND [Transaction Name] IN ( 'DELETE', 'user_transaction' ) AND CONVERT(NVARCHAR(11), [Begin Time]) BETWEEN @Date_From AND @Date_To ) ), --Use this technique to repeate the row till the no of bytes of the row. N1 ( n ) AS ( SELECT 1 UNION ALL SELECT 1 ), N2 ( n ) AS ( SELECT 1 FROM N1 AS X , N1 AS Y ), N3 ( n ) AS ( SELECT 1 FROM N2 AS X , N2 AS Y ), N4 ( n ) AS ( SELECT ROW_NUMBER() OVER ( ORDER BY X.n ) FROM N3 AS X , N3 AS Y ) INSERT INTO @DeletedRecords SELECT RowLogContents , [AllocUnitID] , [Transaction ID] , [FixedLengthData] , [TotalNoOfCols] , [NullBitMapLength] , [NullBytes] , [TotalNoofVarCols] , [ColumnOffsetArray] , [VarColumnStart] , [Slot ID] ---Get the Null value against each column (1 means null zero means not null) , [NullBitMap] = ( REPLACE(STUFF(( SELECT ',' + ( CASE WHEN [ID] = 0 THEN CONVERT(NVARCHAR(1), ( SUBSTRING(NullBytes, n, 1) % 2 )) ELSE CONVERT(NVARCHAR(1), ( ( SUBSTRING(NullBytes, n, 1) / [Bitvalue] ) % 2 )) END ) --as [nullBitMap] FROM N4 AS Nums JOIN RowData AS C ON n <= NullBitMapLength CROSS JOIN @bitTable WHERE C.[RowLogContents] = D.[RowLogContents] ORDER BY [RowLogContents] , n ASC FOR XML PATH('') ), 1, 1, ''), ',', '') ) FROM RowData D IF ( SELECT COUNT(*) FROM @DeletedRecords ) = 0 BEGIN RAISERROR('There is no data in the log as per the search criteria',16,1) RETURN END DECLARE @ColumnNameAndData TABLE ( [Row ID] INT , [Rowlogcontents] VARBINARY(MAX) , [NAME] SYSNAME , [nullbit] SMALLINT , [leaf_offset] SMALLINT , [length] SMALLINT , [system_type_id] TINYINT , [bitpos] TINYINT , [xprec] TINYINT , [xscale] TINYINT , [is_null] INT , [Column value Size] INT , [Column Length] INT , [hex_Value] VARBINARY(MAX) , [Slot ID] INT , [Update] INT ) --Create common table expression and join it with the rowdata table -- to get each column details /*This part is for variable data columns*/ --@RowLogContents, --(col.columnOffValue - col.columnLength) + 1, --col.columnLength --) INSERT INTO @ColumnNameAndData SELECT [Row ID] , Rowlogcontents , NAME , cols.leaf_null_bit AS nullbit , leaf_offset , ISNULL(syscolumns.length, cols.max_length) AS [length] , cols.system_type_id , cols.leaf_bit_position AS bitpos , ISNULL(syscolumns.xprec, cols.precision) AS xprec , ISNULL(syscolumns.xscale, cols.scale) AS xscale , SUBSTRING([nullBitMap], cols.leaf_null_bit, 1) AS is_null , ( CASE WHEN leaf_offset < 1 AND SUBSTRING([nullBitMap], cols.leaf_null_bit, 1) = 0 THEN ( CASE WHEN CONVERT(INT, CONVERT(BINARY(2), REVERSE(SUBSTRING([ColumnOffsetArray], ( 2 * leaf_offset * -1 ) - 1, 2)))) > 30000 THEN CONVERT(INT, CONVERT(BINARY(2), REVERSE(SUBSTRING([ColumnOffsetArray], ( 2 * leaf_offset * -1 ) - 1, 2)))) - POWER(2, 15) ELSE CONVERT(INT, CONVERT(BINARY(2), REVERSE(SUBSTRING([ColumnOffsetArray], ( 2 * leaf_offset * -1 ) - 1, 2)))) END ) END ) AS [Column value Size] , ( CASE WHEN leaf_offset < 1 AND SUBSTRING([nullBitMap], cols.leaf_null_bit, 1) = 0 THEN ( CASE WHEN CONVERT(INT, CONVERT(BINARY(2), REVERSE(SUBSTRING([ColumnOffsetArray], ( 2 * leaf_offset * -1 ) - 1, 2)))) > 30000 AND ISNULL(NULLIF(CONVERT(INT, CONVERT(BINARY(2), REVERSE(SUBSTRING([ColumnOffsetArray], ( 2 * ( ( leaf_offset * -1 ) - 1 ) ) - 1, 2)))), 0), [varColumnStart]) < 30000 THEN ( CASE WHEN [System_type_id] IN ( 35, 34, 99 ) THEN 16 ELSE 24 END ) WHEN CONVERT(INT, CONVERT(BINARY(2), REVERSE(SUBSTRING([ColumnOffsetArray], ( 2 * leaf_offset * -1 ) - 1, 2)))) > 30000 AND ISNULL(NULLIF(CONVERT(INT, CONVERT(BINARY(2), REVERSE(SUBSTRING([ColumnOffsetArray], ( 2 * ( ( leaf_offset * -1 ) - 1 ) ) - 1, 2)))), 0), [varColumnStart]) > 30000 THEN ( CASE WHEN [System_type_id] IN ( 35, 34, 99 ) THEN 16 ELSE 24 END ) --24 WHEN CONVERT(INT, CONVERT(BINARY(2), REVERSE(SUBSTRING([ColumnOffsetArray], ( 2 * leaf_offset * -1 ) - 1, 2)))) < 30000 AND ISNULL(NULLIF(CONVERT(INT, CONVERT(BINARY(2), REVERSE(SUBSTRING([ColumnOffsetArray], ( 2 * ( ( leaf_offset * -1 ) - 1 ) ) - 1, 2)))), 0), [varColumnStart]) < 30000 THEN ( CONVERT(INT, CONVERT(BINARY(2), REVERSE(SUBSTRING([ColumnOffsetArray], ( 2 * leaf_offset * -1 ) - 1, 2)))) - ISNULL(NULLIF(CONVERT(INT, CONVERT(BINARY(2), REVERSE(SUBSTRING([ColumnOffsetArray], ( 2 * ( ( leaf_offset * -1 ) - 1 ) ) - 1, 2)))), 0), [varColumnStart]) ) WHEN CONVERT(INT, CONVERT(BINARY(2), REVERSE(SUBSTRING([ColumnOffsetArray], ( 2 * leaf_offset * -1 ) - 1, 2)))) < 30000 AND ISNULL(NULLIF(CONVERT(INT, CONVERT(BINARY(2), REVERSE(SUBSTRING([ColumnOffsetArray], ( 2 * ( ( leaf_offset * -1 ) - 1 ) ) - 1, 2)))), 0), [varColumnStart]) > 30000 THEN POWER(2, 15) + CONVERT(INT, CONVERT(BINARY(2), REVERSE(SUBSTRING([ColumnOffsetArray], ( 2 * leaf_offset * -1 ) - 1, 2)))) - ISNULL(NULLIF(CONVERT(INT, CONVERT(BINARY(2), REVERSE(SUBSTRING([ColumnOffsetArray], ( 2 * ( ( leaf_offset * -1 ) - 1 ) ) - 1, 2)))), 0), [varColumnStart]) END ) END ) AS [Column Length] , ( CASE WHEN SUBSTRING([nullBitMap], cols.leaf_null_bit, 1) = 1 THEN NULL ELSE SUBSTRING(Rowlogcontents, ( ( CASE WHEN CONVERT(INT, CONVERT(BINARY(2), REVERSE(SUBSTRING([ColumnOffsetArray], ( 2 * leaf_offset * -1 ) - 1, 2)))) > 30000 THEN CONVERT(INT, CONVERT(BINARY(2), REVERSE(SUBSTRING([ColumnOffsetArray], ( 2 * leaf_offset * -1 ) - 1, 2)))) - POWER(2, 15) ELSE CONVERT(INT, CONVERT(BINARY(2), REVERSE(SUBSTRING([ColumnOffsetArray], ( 2 * leaf_offset * -1 ) - 1, 2)))) END ) - ( CASE WHEN CONVERT(INT, CONVERT(BINARY(2), REVERSE(SUBSTRING([ColumnOffsetArray], ( 2 * leaf_offset * -1 ) - 1, 2)))) > 30000 AND ISNULL(NULLIF(CONVERT(INT, CONVERT(BINARY(2), REVERSE(SUBSTRING([ColumnOffsetArray], ( 2 * ( ( leaf_offset * -1 ) - 1 ) ) - 1, 2)))), 0), [varColumnStart]) < 30000 THEN ( CASE WHEN [System_type_id] IN ( 35, 34, 99 ) THEN 16 ELSE 24 END ) --24 WHEN CONVERT(INT, CONVERT(BINARY(2), REVERSE(SUBSTRING([ColumnOffsetArray], ( 2 * leaf_offset * -1 ) - 1, 2)))) > 30000 AND ISNULL(NULLIF(CONVERT(INT, CONVERT(BINARY(2), REVERSE(SUBSTRING([ColumnOffsetArray], ( 2 * ( ( leaf_offset * -1 ) - 1 ) ) - 1, 2)))), 0), [varColumnStart]) > 30000 THEN ( CASE WHEN [System_type_id] IN ( 35, 34, 99 ) THEN 16 ELSE 24 END ) --24 WHEN CONVERT(INT, CONVERT(BINARY(2), REVERSE(SUBSTRING([ColumnOffsetArray], ( 2 * leaf_offset * -1 ) - 1, 2)))) < 30000 AND ISNULL(NULLIF(CONVERT(INT, CONVERT(BINARY(2), REVERSE(SUBSTRING([ColumnOffsetArray], ( 2 * ( ( leaf_offset * -1 ) - 1 ) ) - 1, 2)))), 0), [varColumnStart]) < 30000 THEN CONVERT(INT, CONVERT(BINARY(2), REVERSE(SUBSTRING([ColumnOffsetArray], ( 2 * leaf_offset * -1 ) - 1, 2)))) - ISNULL(NULLIF(CONVERT(INT, CONVERT(BINARY(2), REVERSE(SUBSTRING([ColumnOffsetArray], ( 2 * ( ( leaf_offset * -1 ) - 1 ) ) - 1, 2)))), 0), [varColumnStart]) WHEN CONVERT(INT, CONVERT(BINARY(2), REVERSE(SUBSTRING([ColumnOffsetArray], ( 2 * leaf_offset * -1 ) - 1, 2)))) < 30000 AND ISNULL(NULLIF(CONVERT(INT, CONVERT(BINARY(2), REVERSE(SUBSTRING([ColumnOffsetArray], ( 2 * ( ( leaf_offset * -1 ) - 1 ) ) - 1, 2)))), 0), [varColumnStart]) > 30000 THEN POWER(2, 15) + CONVERT(INT, CONVERT(BINARY(2), REVERSE(SUBSTRING([ColumnOffsetArray], ( 2 * leaf_offset * -1 ) - 1, 2)))) - ISNULL(NULLIF(CONVERT(INT, CONVERT(BINARY(2), REVERSE(SUBSTRING([ColumnOffsetArray], ( 2 * ( ( leaf_offset * -1 ) - 1 ) ) - 1, 2)))), 0), [varColumnStart]) END ) ) + 1, ( CASE WHEN CONVERT(INT, CONVERT(BINARY(2), REVERSE(SUBSTRING([ColumnOffsetArray], ( 2 * leaf_offset * -1 ) - 1, 2)))) > 30000 AND ISNULL(NULLIF(CONVERT(INT, CONVERT(BINARY(2), REVERSE(SUBSTRING([ColumnOffsetArray], ( 2 * ( ( leaf_offset * -1 ) - 1 ) ) - 1, 2)))), 0), [varColumnStart]) < 30000 THEN ( CASE WHEN [System_type_id] IN ( 35, 34, 99 ) THEN 16 ELSE 24 END ) --24 WHEN CONVERT(INT, CONVERT(BINARY(2), REVERSE(SUBSTRING([ColumnOffsetArray], ( 2 * leaf_offset * -1 ) - 1, 2)))) > 30000 AND ISNULL(NULLIF(CONVERT(INT, CONVERT(BINARY(2), REVERSE(SUBSTRING([ColumnOffsetArray], ( 2 * ( ( leaf_offset * -1 ) - 1 ) ) - 1, 2)))), 0), [varColumnStart]) > 30000 THEN ( CASE WHEN [System_type_id] IN ( 35, 34, 99 ) THEN 16 ELSE 24 END ) --24 WHEN CONVERT(INT, CONVERT(BINARY(2), REVERSE(SUBSTRING([ColumnOffsetArray], ( 2 * leaf_offset * -1 ) - 1, 2)))) < 30000 AND ISNULL(NULLIF(CONVERT(INT, CONVERT(BINARY(2), REVERSE(SUBSTRING([ColumnOffsetArray], ( 2 * ( ( leaf_offset * -1 ) - 1 ) ) - 1, 2)))), 0), [varColumnStart]) < 30000 THEN ABS(CONVERT(INT, CONVERT(BINARY(2), REVERSE(SUBSTRING([ColumnOffsetArray], ( 2 * leaf_offset * -1 ) - 1, 2)))) - ISNULL(NULLIF(CONVERT(INT, CONVERT(BINARY(2), REVERSE(SUBSTRING([ColumnOffsetArray], ( 2 * ( ( leaf_offset * -1 ) - 1 ) ) - 1, 2)))), 0), [varColumnStart])) WHEN CONVERT(INT, CONVERT(BINARY(2), REVERSE(SUBSTRING([ColumnOffsetArray], ( 2 * leaf_offset * -1 ) - 1, 2)))) < 30000 AND ISNULL(NULLIF(CONVERT(INT, CONVERT(BINARY(2), REVERSE(SUBSTRING([ColumnOffsetArray], ( 2 * ( ( leaf_offset * -1 ) - 1 ) ) - 1, 2)))), 0), [varColumnStart]) > 30000 THEN POWER(2, 15) + CONVERT(INT, CONVERT(BINARY(2), REVERSE(SUBSTRING([ColumnOffsetArray], ( 2 * leaf_offset * -1 ) - 1, 2)))) - ISNULL(NULLIF(CONVERT(INT, CONVERT(BINARY(2), REVERSE(SUBSTRING([ColumnOffsetArray], ( 2 * ( ( leaf_offset * -1 ) - 1 ) ) - 1, 2)))), 0), [varColumnStart]) END )) END ) AS hex_Value , [Slot ID] , 0 FROM @DeletedRecords A INNER JOIN sys.allocation_units allocunits ON A.[AllocUnitId] = allocunits.[Allocation_Unit_Id] INNER JOIN sys.partitions partitions ON ( allocunits.type IN ( 1, 3 ) AND partitions.hobt_id = allocunits.container_id ) OR ( allocunits.type = 2 AND partitions.partition_id = allocunits.container_id ) INNER JOIN sys.system_internals_partition_columns cols ON cols.partition_id = partitions.partition_id LEFT OUTER JOIN syscolumns ON syscolumns.id = partitions.object_id AND syscolumns.colid = cols.partition_column_id WHERE leaf_offset < 0 UNION /*This part is for fixed data columns*/ SELECT [Row ID] , Rowlogcontents , NAME , cols.leaf_null_bit AS nullbit , leaf_offset , ISNULL(syscolumns.length, cols.max_length) AS [length] , cols.system_type_id , cols.leaf_bit_position AS bitpos , ISNULL(syscolumns.xprec, cols.precision) AS xprec , ISNULL(syscolumns.xscale, cols.scale) AS xscale , SUBSTRING([nullBitMap], cols.leaf_null_bit, 1) AS is_null , ( SELECT TOP 1 ISNULL(SUM(CASE WHEN C.leaf_offset > 1 THEN max_length ELSE 0 END), 0) FROM sys.system_internals_partition_columns C WHERE cols.partition_id = C.partition_id AND C.leaf_null_bit < cols.leaf_null_bit ) + 5 AS [Column value Size] , syscolumns.length AS [Column Length] , CASE WHEN SUBSTRING([nullBitMap], cols.leaf_null_bit, 1) = 1 THEN NULL ELSE SUBSTRING(Rowlogcontents, ( SELECT TOP 1 ISNULL(SUM(CASE WHEN C.leaf_offset > 1 AND C.leaf_bit_position = 0 THEN max_length ELSE 0 END), 0) FROM sys.system_internals_partition_columns C WHERE cols.partition_id = C.partition_id AND C.leaf_null_bit < cols.leaf_null_bit ) + 5, syscolumns.length) END AS hex_Value , [Slot ID] , 0 FROM @DeletedRecords A INNER JOIN sys.allocation_units allocunits ON A.[AllocUnitId] = allocunits.[Allocation_Unit_Id] INNER JOIN sys.partitions partitions ON ( allocunits.type IN ( 1, 3 ) AND partitions.hobt_id = allocunits.container_id ) OR ( allocunits.type = 2 AND partitions.partition_id = allocunits.container_id ) INNER JOIN sys.system_internals_partition_columns cols ON cols.partition_id = partitions.partition_id LEFT OUTER JOIN syscolumns ON syscolumns.id = partitions.object_id AND syscolumns.colid = cols.partition_column_id WHERE leaf_offset > 0 ORDER BY nullbit DECLARE @BitColumnByte AS INT SELECT @BitColumnByte = CONVERT(INT, CEILING(COUNT(*) / 8.0)) FROM @ColumnNameAndData WHERE [System_Type_id] = 104; WITH N1 ( n ) AS ( SELECT 1 UNION ALL SELECT 1 ), N2 ( n ) AS ( SELECT 1 FROM N1 AS X , N1 AS Y ), N3 ( n ) AS ( SELECT 1 FROM N2 AS X , N2 AS Y ), N4 ( n ) AS ( SELECT ROW_NUMBER() OVER ( ORDER BY X.n ) FROM N3 AS X , N3 AS Y ), CTE AS ( SELECT RowLogContents , [nullbit] , [BitMap] = CONVERT(VARBINARY(1), CONVERT(INT, SUBSTRING(( REPLACE(STUFF(( SELECT ',' + ( CASE WHEN [ID] = 0 THEN CONVERT(NVARCHAR(1), ( SUBSTRING(hex_Value, n, 1) % 2 )) ELSE CONVERT(NVARCHAR(1), ( ( SUBSTRING(hex_Value, n, 1) / [Bitvalue] ) % 2 )) END ) --as [nullBitMap] FROM N4 AS Nums JOIN @ColumnNameAndData AS C ON n <= @BitColumnByte AND [System_Type_id] = 104 AND bitpos = 0 CROSS JOIN @bitTable WHERE C.[RowLogContents] = D.[RowLogContents] ORDER BY [RowLogContents] , n ASC FOR XML PATH('') ), 1, 1, ''), ',', '') ), bitpos + 1, 1))) FROM @ColumnNameAndData D WHERE [System_Type_id] = 104 ) UPDATE A SET [hex_Value] = [BitMap] FROM @ColumnNameAndData A INNER JOIN CTE B ON A.[RowLogContents] = B.[RowLogContents] AND A.[nullbit] = B.[nullbit] /**************Check for BLOB DATA TYPES******************************/ DECLARE @Fileid INT DECLARE @Pageid INT DECLARE @Slotid INT DECLARE @CurrentLSN INT DECLARE @LinkID INT DECLARE @Context VARCHAR(50) DECLARE @ConsolidatedPageID VARCHAR(MAX) DECLARE @LCX_TEXT_MIX VARBINARY(MAX) DECLARE @temppagedata TABLE ( [ParentObject] SYSNAME , [Object] SYSNAME , [Field] SYSNAME , [Value] SYSNAME ) DECLARE @pagedata TABLE ( [Page ID] SYSNAME , [File IDS] INT , [Page IDS] INT , [AllocUnitId] BIGINT , [ParentObject] SYSNAME , [Object] SYSNAME , [Field] SYSNAME , [Value] SYSNAME ) DECLARE @ModifiedRawData TABLE ( [ID] INT IDENTITY(1, 1) , [PAGE ID] VARCHAR(MAX) , [FILE IDS] INT , [PAGE IDS] INT , [Slot ID] INT , [AllocUnitId] BIGINT , [RowLog Contents 0_var] VARCHAR(MAX) , [RowLog Length] VARCHAR(50) , [RowLog Len] INT , [RowLog Contents 0] VARBINARY(MAX) , [Link ID] INT DEFAULT ( 0 ) , [Update] INT ) DECLARE Page_Data_Cursor CURSOR FOR /*We need to filter LOP_MODIFY_ROW,LOP_MODIFY_COLUMNS from log for deleted records of BLOB data type& Get its Slot No, Page ID & AllocUnit ID*/ SELECT LTRIM(RTRIM(REPLACE([Description], 'Deallocated', ''))) AS [PAGE ID] , [Slot ID] , [AllocUnitId] , NULL AS [RowLog Contents 0] , NULL AS [RowLog Contents 0] , Context FROM sys.fn_dblog(NULL, NULL) WHERE AllocUnitId IN ( SELECT [Allocation_unit_id] FROM sys.allocation_units allocunits INNER JOIN sys.partitions partitions ON ( allocunits.type IN ( 1, 3 ) AND partitions.hobt_id = allocunits.container_id ) OR ( allocunits.type = 2 AND partitions.partition_id = allocunits.container_id ) WHERE object_id = OBJECT_ID('' + @SchemaName_n_TableName + '') ) AND Operation IN ( 'LOP_MODIFY_ROW' ) AND [Context] IN ( 'LCX_PFS' ) AND Description LIKE '%Deallocated%' /*Use this subquery to filter the date*/ AND [TRANSACTION ID] IN ( SELECT DISTINCT [TRANSACTION ID] FROM sys.fn_dblog(NULL, NULL) WHERE Context IN ( 'LCX_NULL' ) AND Operation IN ( 'LOP_BEGIN_XACT' ) AND [Transaction Name] = 'DELETE' AND CONVERT(NVARCHAR(11), [Begin Time]) BETWEEN @Date_From AND @Date_To ) GROUP BY [Description] , [Slot ID] , [AllocUnitId] , Context UNION SELECT [PAGE ID] , [Slot ID] , [AllocUnitId] , SUBSTRING([RowLog Contents 0], 15, LEN([RowLog Contents 0])) AS [RowLog Contents 0] , CONVERT(INT, SUBSTRING([RowLog Contents 0], 7, 2)) , Context --,CAST(RIGHT([Current LSN],4) AS INT) AS [Current LSN] FROM sys.fn_dblog(NULL, NULL) WHERE AllocUnitId IN ( SELECT [Allocation_unit_id] FROM sys.allocation_units allocunits INNER JOIN sys.partitions partitions ON ( allocunits.type IN ( 1, 3 ) AND partitions.hobt_id = allocunits.container_id ) OR ( allocunits.type = 2 AND partitions.partition_id = allocunits.container_id ) WHERE object_id = OBJECT_ID('' + @SchemaName_n_TableName + '') ) AND Context IN ( 'LCX_TEXT_MIX' ) AND Operation IN ( 'LOP_DELETE_ROWS' ) /*Use this subquery to filter the date*/ AND [TRANSACTION ID] IN ( SELECT DISTINCT [TRANSACTION ID] FROM sys.fn_dblog(NULL, NULL) WHERE Context IN ( 'LCX_NULL' ) AND Operation IN ( 'LOP_BEGIN_XACT' ) AND [Transaction Name] = 'DELETE' AND CONVERT(NVARCHAR(11), [Begin Time]) BETWEEN @Date_From AND @Date_To ) /****************************************/ OPEN Page_Data_Cursor FETCH NEXT FROM Page_Data_Cursor INTO @ConsolidatedPageID, @Slotid, @AllocUnitID, @LCX_TEXT_MIX, @LinkID, @Context WHILE @@FETCH_STATUS = 0 BEGIN DECLARE @hex_pageid AS VARCHAR(MAX) /*Page ID contains File Number and page number It looks like 0001:00000130. In this example 0001 is file Number & 00000130 is Page Number & These numbers are in Hex format*/ SET @Fileid = SUBSTRING(@ConsolidatedPageID, 0, CHARINDEX(':', @ConsolidatedPageID)) -- Seperate File ID from Page ID SET @hex_pageid = '0x' + SUBSTRING(@ConsolidatedPageID, CHARINDEX(':', @ConsolidatedPageID) + 1, LEN(@ConsolidatedPageID)) ---Seperate the page ID SELECT @Pageid = CONVERT(INT, CAST('' AS XML).value('xs:hexBinary(substring(sql:variable("@hex_pageid"),sql:column("t.pos")) )', 'varbinary(max)')) -- Convert Page ID from hex to integer FROM ( SELECT CASE SUBSTRING(@hex_pageid, 1, 2) WHEN '0x' THEN 3 ELSE 0 END ) AS t ( pos ) IF @Context = 'LCX_PFS' BEGIN DELETE @temppagedata INSERT INTO @temppagedata EXEC ( 'DBCC PAGE(' + @DataBase_Name + ', ' + @fileid + ', ' + @pageid + ', 1) with tableresults,no_infomsgs;' ); INSERT INTO @pagedata SELECT @ConsolidatedPageID , @fileid , @pageid , @AllocUnitID , [ParentObject] , [Object] , [Field] , [Value] FROM @temppagedata END ELSE IF @Context = 'LCX_TEXT_MIX' BEGIN INSERT INTO @ModifiedRawData SELECT @ConsolidatedPageID , @fileid , @pageid , @Slotid , @AllocUnitID , NULL , 0 , CONVERT(INT, CONVERT(VARBINARY, REVERSE(SUBSTRING(@LCX_TEXT_MIX, 11, 2)))) , @LCX_TEXT_MIX , @LinkID , 0 END FETCH NEXT FROM Page_Data_Cursor INTO @ConsolidatedPageID, @Slotid, @AllocUnitID, @LCX_TEXT_MIX, @LinkID, @Context END CLOSE Page_Data_Cursor DEALLOCATE Page_Data_Cursor DECLARE @Newhexstring VARCHAR(MAX); --The data is in multiple rows in the page, so we need to convert it into one row as a single hex value. --This hex value is in string format INSERT INTO @ModifiedRawData ( [PAGE ID] , [FILE IDS] , [PAGE IDS] , [Slot ID] , [AllocUnitId] , [RowLog Contents 0_var] , [RowLog Length] ) SELECT [Page ID] , [FILE IDS] , [PAGE IDS] , SUBSTRING([ParentObject], CHARINDEX('Slot', [ParentObject]) + 4, ( CHARINDEX('Offset', [ParentObject]) - ( CHARINDEX('Slot', [ParentObject]) + 4 ) ) - 2) AS [Slot ID] , [AllocUnitId] , SUBSTRING(( SELECT REPLACE(STUFF(( SELECT REPLACE(SUBSTRING([Value], CHARINDEX(':', [Value]) + 1, CHARINDEX('†', [Value]) - CHARINDEX(':', [Value])), '†', '') FROM @pagedata C WHERE B.[Page ID] = C.[Page ID] AND SUBSTRING(B.[ParentObject], CHARINDEX('Slot', B.[ParentObject]) + 4, ( CHARINDEX('Offset', B.[ParentObject]) - ( CHARINDEX('Slot', B.[ParentObject]) + 4 ) )) = SUBSTRING(C.[ParentObject], CHARINDEX('Slot', C.[ParentObject]) + 4, ( CHARINDEX('Offset', C.[ParentObject]) - ( CHARINDEX('Slot', C.[ParentObject]) + 4 ) )) AND [Object] LIKE '%Memory Dump%' ORDER BY '0x' + LEFT([Value], CHARINDEX(':', [Value]) - 1) FOR XML PATH('') ), 1, 1, ''), ' ', '') ), 1, 20000) AS [Value] , SUBSTRING(( SELECT '0x' + REPLACE(STUFF(( SELECT REPLACE(SUBSTRING([Value], CHARINDEX(':', [Value]) + 1, CHARINDEX('†', [Value]) - CHARINDEX(':', [Value])), '†', '') FROM @pagedata C WHERE B.[Page ID] = C.[Page ID] AND SUBSTRING(B.[ParentObject], CHARINDEX('Slot', B.[ParentObject]) + 4, ( CHARINDEX('Offset', B.[ParentObject]) - ( CHARINDEX('Slot', B.[ParentObject]) + 4 ) )) = SUBSTRING(C.[ParentObject], CHARINDEX('Slot', C.[ParentObject]) + 4, ( CHARINDEX('Offset', C.[ParentObject]) - ( CHARINDEX('Slot', C.[ParentObject]) + 4 ) )) AND [Object] LIKE '%Memory Dump%' ORDER BY '0x' + LEFT([Value], CHARINDEX(':', [Value]) - 1) FOR XML PATH('') ), 1, 1, ''), ' ', '') ), 7, 4) AS [Length] FROM @pagedata B WHERE [Object] LIKE '%Memory Dump%' GROUP BY [Page ID] , [FILE IDS] , [PAGE IDS] , [ParentObject] , [AllocUnitId]--,[Current LSN] ORDER BY [Slot ID] UPDATE @ModifiedRawData SET [RowLog Len] = CONVERT(VARBINARY(8000), REVERSE(CAST('' AS XML).value('xs:hexBinary(substring(sql:column("[RowLog Length]"),0))', 'varbinary(Max)'))) FROM @ModifiedRawData WHERE [LINK ID] = 0 UPDATE @ModifiedRawData SET [RowLog Contents 0] = CAST('' AS XML).value('xs:hexBinary(substring(sql:column("[RowLog Contents 0_var]"),0))', 'varbinary(Max)') FROM @ModifiedRawData WHERE [LINK ID] = 0 UPDATE B SET B.[RowLog Contents 0] = ( CASE WHEN A.[RowLog Contents 0] IS NOT NULL AND C.[RowLog Contents 0] IS NOT NULL THEN A.[RowLog Contents 0] + C.[RowLog Contents 0] WHEN A.[RowLog Contents 0] IS NULL AND C.[RowLog Contents 0] IS NOT NULL THEN C.[RowLog Contents 0] WHEN A.[RowLog Contents 0] IS NOT NULL AND C.[RowLog Contents 0] IS NULL THEN A.[RowLog Contents 0] END ) , B.[Update] = ISNULL(B.[Update], 0) + 1 FROM @ModifiedRawData B LEFT JOIN @ModifiedRawData A ON A.[Page IDS] = CONVERT(INT, CONVERT(VARBINARY(MAX), REVERSE(SUBSTRING(B.[RowLog Contents 0], 15 + 14, 2)))) AND A.[File IDS] = CONVERT(INT, CONVERT(VARBINARY(MAX), REVERSE(SUBSTRING(B.[RowLog Contents 0], 19 + 14, 2)))) AND A.[Link ID] = B.[Link ID] LEFT JOIN @ModifiedRawData C ON C.[Page IDS] = CONVERT(INT, CONVERT(VARBINARY(MAX), REVERSE(SUBSTRING(B.[RowLog Contents 0], 27 + 14, 2)))) AND C.[File IDS] = CONVERT(INT, CONVERT(VARBINARY(MAX), REVERSE(SUBSTRING(B.[RowLog Contents 0], 31 + 14, 2)))) AND C.[Link ID] = B.[Link ID] WHERE ( A.[RowLog Contents 0] IS NOT NULL OR C.[RowLog Contents 0] IS NOT NULL ) UPDATE B SET B.[RowLog Contents 0] = ( CASE WHEN A.[RowLog Contents 0] IS NOT NULL AND C.[RowLog Contents 0] IS NOT NULL THEN A.[RowLog Contents 0] + C.[RowLog Contents 0] WHEN A.[RowLog Contents 0] IS NULL AND C.[RowLog Contents 0] IS NOT NULL THEN C.[RowLog Contents 0] WHEN A.[RowLog Contents 0] IS NOT NULL AND C.[RowLog Contents 0] IS NULL THEN A.[RowLog Contents 0] END ) --,B.[Update]=ISNULL(B.[Update],0)+1 FROM @ModifiedRawData B LEFT JOIN @ModifiedRawData A ON A.[Page IDS] = CONVERT(INT, CONVERT(VARBINARY(MAX), REVERSE(SUBSTRING(B.[RowLog Contents 0], 15 + 14, 2)))) AND A.[File IDS] = CONVERT(INT, CONVERT(VARBINARY(MAX), REVERSE(SUBSTRING(B.[RowLog Contents 0], 19 + 14, 2)))) AND A.[Link ID] <> B.[Link ID] AND B.[Update] = 0 LEFT JOIN @ModifiedRawData C ON C.[Page IDS] = CONVERT(INT, CONVERT(VARBINARY(MAX), REVERSE(SUBSTRING(B.[RowLog Contents 0], 27 + 14, 2)))) AND C.[File IDS] = CONVERT(INT, CONVERT(VARBINARY(MAX), REVERSE(SUBSTRING(B.[RowLog Contents 0], 31 + 14, 2)))) AND C.[Link ID] <> B.[Link ID] AND B.[Update] = 0 WHERE ( A.[RowLog Contents 0] IS NOT NULL OR C.[RowLog Contents 0] IS NOT NULL ) UPDATE @ModifiedRawData SET [RowLog Contents 0] = ( CASE WHEN [RowLog Len] >= 8000 THEN SUBSTRING([RowLog Contents 0], 15, [RowLog Len]) WHEN [RowLog Len] < 8000 THEN SUBSTRING([RowLog Contents 0], 15 + 6, CONVERT(INT, CONVERT(VARBINARY(MAX), REVERSE(SUBSTRING([RowLog Contents 0], 15, 6))))) END ) FROM @ModifiedRawData WHERE [LINK ID] = 0 UPDATE @ColumnNameAndData SET [hex_Value] = [RowLog Contents 0] --,A.[Update]=A.[Update]+1 FROM @ColumnNameAndData A INNER JOIN @ModifiedRawData B ON CONVERT(INT, CONVERT(VARBINARY(MAX), REVERSE(SUBSTRING([hex_value], 17, 4)))) = [PAGE IDS] AND CONVERT(INT, SUBSTRING([hex_value], 9, 2)) = B.[Link ID] WHERE [System_Type_Id] IN ( 99, 167, 175, 231, 239, 241, 165, 98 ) AND [Link ID] <> 0 UPDATE @ColumnNameAndData SET [hex_Value] = ( CASE WHEN B.[RowLog Contents 0] IS NOT NULL AND C.[RowLog Contents 0] IS NOT NULL THEN B.[RowLog Contents 0] + C.[RowLog Contents 0] WHEN B.[RowLog Contents 0] IS NULL AND C.[RowLog Contents 0] IS NOT NULL THEN C.[RowLog Contents 0] WHEN B.[RowLog Contents 0] IS NOT NULL AND C.[RowLog Contents 0] IS NULL THEN B.[RowLog Contents 0] END ) --,A.[Update]=A.[Update]+1 FROM @ColumnNameAndData A LEFT JOIN @ModifiedRawData B ON CONVERT(INT, CONVERT(VARBINARY(MAX), REVERSE(SUBSTRING([hex_value], 5, 4)))) = B.[PAGE IDS] AND B.[Link ID] = 0 LEFT JOIN @ModifiedRawData C ON CONVERT(INT, CONVERT(VARBINARY(MAX), REVERSE(SUBSTRING([hex_value], 17, 4)))) = C.[PAGE IDS] AND C.[Link ID] = 0 WHERE [System_Type_Id] IN ( 99, 167, 175, 231, 239, 241, 165, 98 ) AND ( B.[RowLog Contents 0] IS NOT NULL OR C.[RowLog Contents 0] IS NOT NULL ) UPDATE @ColumnNameAndData SET [hex_Value] = [RowLog Contents 0] --,A.[Update]=A.[Update]+1 FROM @ColumnNameAndData A INNER JOIN @ModifiedRawData B ON CONVERT(INT, CONVERT(VARBINARY(MAX), REVERSE(SUBSTRING([hex_value], 9, 4)))) = [PAGE IDS] AND CONVERT(INT, SUBSTRING([hex_value], 3, 2)) = [Link ID] WHERE [System_Type_Id] IN ( 35, 34, 99 ) AND [Link ID] <> 0 UPDATE @ColumnNameAndData SET [hex_Value] = [RowLog Contents 0] --,A.[Update]=A.[Update]+10 FROM @ColumnNameAndData A INNER JOIN @ModifiedRawData B ON CONVERT(INT, CONVERT(VARBINARY(MAX), REVERSE(SUBSTRING([hex_value], 9, 4)))) = [PAGE IDS] WHERE [System_Type_Id] IN ( 35, 34, 99 ) AND [Link ID] = 0 UPDATE @ColumnNameAndData SET [hex_Value] = [RowLog Contents 0] --,A.[Update]=A.[Update]+1 FROM @ColumnNameAndData A INNER JOIN @ModifiedRawData B ON CONVERT(INT, CONVERT(VARBINARY(MAX), REVERSE(SUBSTRING([hex_value], 15, 4)))) = [PAGE IDS] WHERE [System_Type_Id] IN ( 35, 34, 99 ) AND [Link ID] = 0 UPDATE @ColumnNameAndData SET [hex_value] = 0xFFFE + SUBSTRING([hex_value], 9, LEN([hex_value])) --,[Update]=[Update]+1 WHERE [system_type_id] = 241 CREATE TABLE [#temp_Data] ( [FieldName] VARCHAR(MAX) , [FieldValue] NVARCHAR(MAX) , [Rowlogcontents] VARBINARY(8000) , [Row ID] INT ) INSERT INTO #temp_Data SELECT NAME , CASE WHEN system_type_id IN ( 231, 239 ) THEN LTRIM(RTRIM(CONVERT(NVARCHAR(MAX), hex_Value))) --NVARCHAR ,NCHAR WHEN system_type_id IN ( 167, 175 ) THEN LTRIM(RTRIM(CONVERT(VARCHAR(MAX), hex_Value))) --VARCHAR,CHAR WHEN system_type_id IN ( 35 ) THEN LTRIM(RTRIM(CONVERT(VARCHAR(MAX), hex_Value))) --Text WHEN system_type_id IN ( 99 ) THEN LTRIM(RTRIM(CONVERT(NVARCHAR(MAX), hex_Value))) --nText WHEN system_type_id = 48 THEN CONVERT(VARCHAR(MAX), CONVERT(TINYINT, CONVERT(BINARY(1), REVERSE(hex_Value)))) --TINY INTEGER WHEN system_type_id = 52 THEN CONVERT(VARCHAR(MAX), CONVERT(SMALLINT, CONVERT(BINARY(2), REVERSE(hex_Value)))) --SMALL INTEGER WHEN system_type_id = 56 THEN CONVERT(VARCHAR(MAX), CONVERT(INT, CONVERT(BINARY(4), REVERSE(hex_Value)))) -- INTEGER WHEN system_type_id = 127 THEN CONVERT(VARCHAR(MAX), CONVERT(BIGINT, CONVERT(BINARY(8), REVERSE(hex_Value))))-- BIG INTEGER WHEN system_type_id = 61 THEN CONVERT(VARCHAR(MAX), CONVERT(DATETIME, CONVERT(VARBINARY(8000), REVERSE(hex_Value))), 100) --DATETIME WHEN system_type_id = 58 THEN CONVERT(VARCHAR(MAX), CONVERT(SMALLDATETIME, CONVERT(VARBINARY(8000), REVERSE(hex_Value))), 100) --SMALL DATETIME WHEN system_type_id = 108 THEN CONVERT(VARCHAR(MAX), CONVERT(NUMERIC(38, 20), CONVERT(VARBINARY, CONVERT(VARBINARY(1), xprec) + CONVERT(VARBINARY(1), xscale)) + CONVERT(VARBINARY(1), 0) + hex_Value)) --- NUMERIC WHEN system_type_id = 106 THEN CONVERT(VARCHAR(MAX), CONVERT(DECIMAL(38, 20), CONVERT(VARBINARY, CONVERT(VARBINARY(1), xprec) + CONVERT(VARBINARY(1), xscale)) + CONVERT(VARBINARY(1), 0) + hex_Value)) --- DECIMAL WHEN system_type_id IN ( 60, 122 ) THEN CONVERT(VARCHAR(MAX), CONVERT(MONEY, CONVERT(VARBINARY(8000), REVERSE(hex_Value))), 2) --MONEY,SMALLMONEY WHEN system_type_id = 104 THEN CONVERT(VARCHAR(MAX), CONVERT (BIT, CONVERT(BINARY(1), hex_Value) % 2)) -- BIT WHEN system_type_id = 62 THEN RTRIM(LTRIM(STR(CONVERT(FLOAT, SIGN(CAST(CONVERT(VARBINARY(8000), REVERSE(hex_Value)) AS BIGINT)) * ( 1.0 + ( CAST(CONVERT(VARBINARY(8000), REVERSE(hex_Value)) AS BIGINT) & 0x000FFFFFFFFFFFFF ) * POWER(CAST(2 AS FLOAT), -52) ) * POWER(CAST(2 AS FLOAT), ( ( CAST(CONVERT(VARBINARY(8000), REVERSE(hex_Value)) AS BIGINT) & 0x7ff0000000000000 ) / EXP(52 * LOG(2)) - 1023 ))), 53, LEN(hex_Value)))) --- FLOAT WHEN system_type_id = 59 THEN LEFT(LTRIM(STR(CAST(SIGN(CAST(CONVERT(VARBINARY(8000), REVERSE(hex_Value)) AS BIGINT)) * ( 1.0 + ( CAST(CONVERT(VARBINARY(8000), REVERSE(hex_Value)) AS BIGINT) & 0x007FFFFF ) * POWER(CAST(2 AS REAL), -23) ) * POWER(CAST(2 AS REAL), ( ( ( CAST(CONVERT(VARBINARY(8000), REVERSE(hex_Value)) AS INT) ) & 0x7f800000 ) / EXP(23 * LOG(2)) - 127 )) AS REAL), 23, 23)), 8) --Real WHEN system_type_id IN ( 165, 173 ) THEN ( CASE WHEN CHARINDEX(0x, CAST('' AS XML).value('xs:hexBinary(sql:column("hex_Value"))', 'VARBINARY(8000)')) = 0 THEN '0x' ELSE '' END ) + CAST('' AS XML).value('xs:hexBinary(sql:column("hex_Value"))', 'varchar(max)') -- BINARY,VARBINARY WHEN system_type_id = 34 THEN ( CASE WHEN CHARINDEX(0x, CAST('' AS XML).value('xs:hexBinary(sql:column("hex_Value"))', 'VARBINARY(8000)')) = 0 THEN '0x' ELSE '' END ) + CAST('' AS XML).value('xs:hexBinary(sql:column("hex_Value"))', 'varchar(max)') --IMAGE WHEN system_type_id = 36 THEN CONVERT(VARCHAR(MAX), CONVERT(UNIQUEIDENTIFIER, hex_Value)) --UNIQUEIDENTIFIER WHEN system_type_id = 231 THEN CONVERT(VARCHAR(MAX), CONVERT(SYSNAME, hex_Value)) --SYSNAME WHEN system_type_id = 241 THEN CONVERT(VARCHAR(MAX), CONVERT(XML, hex_Value)) --XML WHEN system_type_id = 189 THEN ( CASE WHEN CHARINDEX(0x, CAST('' AS XML).value('xs:hexBinary(sql:column("hex_Value"))', 'VARBINARY(8000)')) = 0 THEN '0x' ELSE '' END ) + CAST('' AS XML).value('xs:hexBinary(sql:column("hex_Value"))', 'varchar(max)') --TIMESTAMP WHEN system_type_id = 98 THEN ( CASE WHEN CONVERT(INT, SUBSTRING(hex_Value, 1, 1)) = 56 THEN CONVERT(VARCHAR(MAX), CONVERT(INT, CONVERT(BINARY(4), REVERSE(SUBSTRING(hex_Value, 3, LEN(hex_Value)))))) -- INTEGER WHEN CONVERT(INT, SUBSTRING(hex_Value, 1, 1)) = 108 THEN CONVERT(VARCHAR(MAX), CONVERT(NUMERIC(38, 20), CONVERT(VARBINARY(1), SUBSTRING(hex_Value, 3, 1)) + CONVERT(VARBINARY(1), SUBSTRING(hex_Value, 4, 1)) + CONVERT(VARBINARY(1), 0) + SUBSTRING(hex_Value, 5, LEN(hex_Value)))) --- NUMERIC WHEN CONVERT(INT, SUBSTRING(hex_Value, 1, 1)) = 167 THEN LTRIM(RTRIM(CONVERT(VARCHAR(MAX), SUBSTRING(hex_Value, 9, LEN(hex_Value))))) --VARCHAR,CHAR WHEN CONVERT(INT, SUBSTRING(hex_Value, 1, 1)) = 36 THEN CONVERT(VARCHAR(MAX), CONVERT(UNIQUEIDENTIFIER, SUBSTRING(( hex_Value ), 3, 20))) --UNIQUEIDENTIFIER WHEN CONVERT(INT, SUBSTRING(hex_Value, 1, 1)) = 61 THEN CONVERT(VARCHAR(MAX), CONVERT(DATETIME, CONVERT(VARBINARY(8000), REVERSE(SUBSTRING(hex_Value, 3, LEN(hex_Value))))), 100) --DATETIME WHEN CONVERT(INT, SUBSTRING(hex_Value, 1, 1)) = 165 THEN '0x' + SUBSTRING(( CASE WHEN CHARINDEX(0x, CAST('' AS XML).value('xs:hexBinary(sql:column("hex_Value"))', 'VARBINARY(8000)')) = 0 THEN '0x' ELSE '' END ) + CAST('' AS XML).value('xs:hexBinary(sql:column("hex_Value"))', 'varchar(max)'), 11, LEN(hex_Value)) -- BINARY,VARBINARY END ) END AS FieldValue , [Rowlogcontents] , [Row ID] FROM @ColumnNameAndData ORDER BY nullbit --Create the column name in the same order to do pivot table. DECLARE @FieldName VARCHAR(MAX) SET @FieldName = STUFF(( SELECT ',' + CAST(QUOTENAME([Name]) AS VARCHAR(MAX)) FROM syscolumns WHERE id = OBJECT_ID('' + @SchemaName_n_TableName + '') FOR XML PATH('') ), 1, 1, '') --Finally did pivot table and get the data back in the same format. SET @sql = 'SELECT ' + @FieldName + ' FROM #temp_Data PIVOT (Min([FieldValue]) FOR FieldName IN (' + @FieldName + ')) AS pvt' EXEC sp_executesql @sql GO
恢复你的数据
--恢复数据，不加时间段条件 参数：数据库名，表名 --EXAMPLE #1 : FOR ALL DELETED RECORDS EXEC Recover_Deleted_Data_Proc 'test','dbo.aa' GO --恢复数据，加时间段条件 --EXAMPLE #2 : FOR ANY SPECIFIC DATE RANGE EXEC Recover_Deleted_Data_Proc 'test','dbo.aa','2014-04-23','2014-04-23'
执行了下面的存储过程之后你会发现会显示出刚才删除的数据
EXEC Recover_Deleted_Data_Proc 'test','dbo.aa' GO
解释
究竟他是如何工作的?让我们来一步一步来,这个过程涉及到7个步骤:
步骤1:
我们需要获得SQLSERVER删除的数据记录.使用标准SQLSERVER函数fn_dblog，我们能够容易的获得事务日志记录（包括
已删的数据。不过，我们只需要事务日志中选中的被删数据，所以我们的过滤条件需要包含3个字段 Context, Operation & AllocUnitName）
We need to get the deleted records from sql server. By using the standard SQL Server function fn_blog, we can easily get all transaction log (Including deleted data. But, we need only the selected deleted records from the transaction log. So we included three filters (Context, Operation , AllocUnitName).
- Context (‘LCX_MARK_AS_GHOST’and ‘LCX_HEAP’)
- Operation (‘LOP_DELETE_ROWS’)
- AllocUnitName(‘dbo.aa’) –- Schema + table Name
Context可以说明是堆表还是聚集表
Operation：删除操作
AllocUnitName：分配单元名称，表名
下面是一个代码片段
SELECT [RowLog Contents 0] FROM sys.fn_dblog(NULL, NULL) WHERE AllocUnitName = 'dbo.aa' AND Context IN ( 'LCX_MARK_AS_GHOST', 'LCX_HEAP' ) AND Operation IN ( 'LOP_DELETE_ROWS' )
这个查询会返回不同列的信息，但是我们只需要选择[RowLog Contents 0]列，去获得被删除的数据的内容
RowLog content 0列的内容类似于这样
“0x300018000100000000000000006B0000564920205900000
00500E001002800426F62206A65727279″
步骤2:
现在，我们已经删除了数据，这些数据以hex码的形式放在事务日志里，这些hex码是有规律的，我们根据这些规律可以很容易恢复这些数据。
不过在恢复这些数据之前，我们需要理解这些格式。这些格式在KalenDelaney’s SQL Internal’s book.的书里面有讲解
- 1 Byte : Status Bit A
- 1 Byte : Status Bit B
- 2 Bytes : Fixed length size
- n Bytes : Fixed length data
- 2 Bytes : Total Number of Columns
- n Bytes : NULL Bitmap (1 bit for each column as 1 indicates that the column is null and 0 indicate that the column is not null)
- 2 Bytes : Number of variable-length columns
- n Bytes : Column offset array (2x variable length column)
- n Bytes : Data for variable length columns
所以, hex码的“RowLog content 0″列的内容就等价于
“Status Bit A +Status Bit B +Fixed length size +Fixed length data +Total Number of Columns +NULL Bitmap +Number of variable-length columns +NULL Bitmap+Number of variable-length columns +Column offset array +Data for variable length columns.”
更详细的可以参考：SQL Server2008存储结构之堆表、行溢出
关于数据行的结构我们还可以采用稍微宏观一些的视角来查看。
步骤3:
现在，我们需要解剖RowLog Content o列的内容（我们删除的数据的Hex码），利用上面的数据行的结构
- [Fixed Length Data] = Substring (RowLog content 0, Status Bit A+Status Bit B + 1,2 bytes)
- [Total No of Columns]= Substring (RowLog content 0, [Fixed Length Data] + 1,2 bytes)
- [Null Bitmap length] = Ceiling ([Total No of Columns]/8.0)
- [Null Bytes]= Substring (RowLog content 0, Status Bit A+ Status Bit B +[Fixed Length Data] +1, [Null Bitmap length] )
- Total no of variable columns = Substring (RowLog content 0, Status Bit A+ Status Bit B + [Fixed Length Data] +1, [Null Bitmap length] + 2 )
- Column Offset Array= Substring (RowLog content 0, Status Bit A+ Status Bit B + [Fixed Length Data] +1, [Null Bitmap length] + 2 , Total no of variable columns*2 )
- Variable Column Start = Status Bit A+ Status Bit B + [Fixed Length Data] + [Null Bitmap length] + 2+( Total no of variable columns*2)
步骤4:
现在我们已经将hex码切开了(0x300008000100000002000001001300604F7D59),所以,我们能找到删除的行的某列的数据是否为null值
根据NULL位图。为了完成将NULL Bytes的hex码转换为二进制格式（正如之前讨论的，1表示行中对应的那一列为null，而0则表示对应的列有实际的数据）
如果还不是明白的童鞋可以看一下我写的这篇文章：《SQLSERVER中NULL位图的作用》
步骤5:
现在，我们已经做了初步的数据分割 (Step-3) 和null值判断(Step-4) 。然后我们需要使用代码片段去获得列数据，例如：列名，列大小，精度，范围
和最重要的叶子的null位（确保列数据是固定长度的（<=-1表示可变长度）或者固定长度的（>=1））
使用下面的SQL语句
SELECT * FROM sys.allocation_units allocunits INNER JOIN sys.partitions partitions ON ( allocunits.type IN ( 1, 3 ) AND partitions.hobt_id = allocunits.container_id ) OR ( allocunits.type = 2 AND partitions.partition_id = allocunits.container_id ) INNER JOIN sys.system_internals_partition_columns cols ON cols.partition_id = partitions.partition_id LEFT OUTER JOIN syscolumns ON syscolumns.id = partitions.object_id AND syscolumns.colid = cols.partition_column_id
与(Step-1,2,3,4) 获得的数据表做join连接，根据allocunits.[Allocation_Unit_Id]。
现在我们知道表和表中的数据信息，那么我们需要利用这些数据去将 [RowLog Contents 0] 列里的hex码的数据插入到表中的相应列
现在我们需要关心每一列的数据究竟是固定长度的还是可变长度的
步骤6:
我们收集了每列的hex格式的数据。现在我们需要利用[System_type_id]去转换这些数据回去正确的数据类型
每一种数据类型都有不同的数据类型转换机制。
--NVARCHAR ,NCHAR WHEN system_type_id IN (231, 239) THEN LTRIM(RTRIM(CONVERT(NVARCHAR(max),hex_Value))) --VARCHAR,CHAR WHEN system_type_id IN (167,175) THEN LTRIM(RTRIM(CONVERT(VARCHAR(max),REPLACE(hex_Value, 0x00, 0x20)))) --TINY INTEGER WHEN system_type_id = 48 THEN CONVERT(VARCHAR(MAX), CONVERT(TINYINT, CONVERT(BINARY(1), REVERSE (hex_Value)))) --SMALL INTEGER WHEN system_type_id = 52 THEN CONVERT(VARCHAR(MAX), CONVERT(SMALLINT, CONVERT(BINARY(2), REVERSE (hex_Value)))) -- INTEGER WHEN system_type_id = 56 THEN CONVERT(VARCHAR(MAX), CONVERT(INT, CONVERT(BINARY(4), REVERSE(hex_Value)))) -- BIG INTEGER WHEN system_type_id = 127 THEN CONVERT(VARCHAR(MAX), CONVERT(BIGINT, CONVERT(BINARY(8), REVERSE(hex_Value)))) --DATETIME WHEN system_type_id = 61 Then CONVERT(VARCHAR(Max),CONVERT(DATETIME,Convert(VARBINARY(max),REVERSE (hex_Value))),100) --SMALL DATETIME WHEN system_type_id =58 Then CONVERT(VARCHAR(Max),CONVERT(SMALLDATETIME,CONVERT(VARBINARY(MAX),REVERSE(hex_Value))),100) --SMALL DATETIME --- NUMERIC WHEN system_type_id = 108 THEN CONVERT(VARCHAR(MAX), CAST(CONVERT(NUMERIC(18,14), CONVERT(VARBINARY,CONVERT(VARBINARY,xprec)+CONVERT(VARBINARY,xscale))+CONVERT(VARBINARY(1),0) + hex_Value) as FLOAT)) --MONEY,SMALLMONEY WHEN system_type_id In(60,122) THEN CONVERT(VARCHAR(MAX),Convert(MONEY,Convert(VARBINARY(MAX),Reverse(hex_Value))),2) --- DECIMAL WHEN system_type_id = 106 THEN CONVERT(VARCHAR(MAX), CAST(CONVERT(Decimal(38,34), Convert(VARBINARY,Convert(VARBINARY,xprec)+CONVERT(VARBINARY,xscale))+CONVERT(VARBINARY(1),0) + hex_Value) as FLOAT)) -- BIT WHEN system_type_id = 104 THEN CONVERT(VARCHAR(MAX),CONVERT (BIT,CONVERT(BINARY(1), hex_Value)%2)) --- FLOAT WHEN system_type_id = 62 THEN RTRIM(LTRIM(Str(Convert(FLOAT,SIGN(CAST(Convert(VARBINARY(max),Reverse(hex_Value)) AS BIGINT)) * (1.0 + (CAST(CONVERT(VARBINARY(max),Reverse(hex_Value)) AS BIGINT) & 0x000FFFFFFFFFFFFF) * POWER(CAST(2 AS FLOAT), -52)) * POWER(CAST(2 AS FLOAT),((CAST(CONVERT(VARBINARY(max),Reverse(hex_Value)) AS BIGINT) & 0x7ff0000000000000) / EXP(52 * LOG(2))-1023))),53,LEN(hex_Value)))) --REAL When system_type_id =59 THEN Left(LTRIM(STR(Cast(SIGN(CAST(Convert(VARBINARY(max),Reverse(hex_Value)) AS BIGINT))* (1.0 + (CAST(CONVERT(VARBINARY(max),Reverse(hex_Value)) AS BIGINT) & 0x007FFFFF) * POWER(CAST(2 AS Real), -23)) * POWER(CAST(2 AS Real),(((CAST(CONVERT(VARBINARY(max),Reverse(hex_Value)) AS INT) )& 0x7f800000)/ EXP(23 * LOG(2))-127))AS REAL),23,23)),8) --BINARY,VARBINARY WHEN system_type_id In (165,173) THEN (CASE WHEN Charindex(0x,cast('' AS XML).value('xs:hexBinary(sql:column("hex_value"))', 'varbinary(max)')) = 0 THEN '0x' ELSE '' END) +cast('' AS XML).value('xs:hexBinary(sql:column("hex_value"))', 'varchar(max)') --UNIQUEIDENTIFIER WHEN system_type_id =36 THEN CONVERT(VARCHAR(MAX),CONVERT(UNIQUEIDENTIFIER,hex_Value))
步骤7:
最终我们做一个数据透视表，你会看到最后的结果：被删的数据回来了！
注意：这些数据只是展示出来并没有自动插入回表中，你需要将这些数据重新插入回去表中！
我的测试
经过测试，作者写的这个存储过程还是有些问题
如果你创建的测试表的数据类型有xml或者是一些text数据类型的字段会有报错
Msg 537, Level 16, State 3, Procedure Recover_Deleted_Data_Proc, Line 525 Invalid length parameter passed to the LEFT or SUBSTRING function. Msg 9420, Level 16, State 1, Procedure Recover_Deleted_Data_Proc, Line 651 XML parsing: line 1, character 2, illegal xml character
但是一般的数据类型则不会，例如nvarchar这些
还有不要在存储过程的最后加
--Recover the deleted data without date range EXEC Recover_Deleted_Data_Proc 'test','dbo.Test_Table' GO --Recover the deleted data it with date range EXEC Recover_Deleted_Data_Proc 'test','dbo.Test_Table','2012-06-01','2012-06-30'
否则会报错
消息 50000，级别 16，状态 1，过程 Recover_Deleted_Data_Proc，第 290 行 There is no data in the log as per the search criteria
总结
实际上这个存储过程还是挺有研究意义的，对于想做一个跟Log Explorer for SQL Server软件功能差不多的软件出来
还是有可能的，跟着作者的思路，一步一步实现
苦于最近太忙，先分享出来，以后再研究这个存储过程了~
如有不对的地方，欢迎大家拍砖o(∩_∩)o
支持date类型 感谢园友 dwchaoyue
EXEC Recover_Deleted_Data_Proc 'sss','dbo.testdaterecover','2014-04-23','2014-10-23' --DROP TABLE testdaterecover CREATE TABLE testdaterecover(dd DATE,cc DATETIME) GO INSERT INTO [dbo].[testdaterecover] ( [dd], [cc] ) VALUES ( GETDATE(), -- dd - date GETDATE() -- cc - datetime ) SELECT CONVERT(VARCHAR(MAX),CONVERT(DATETIME, CONVERT(VARBINARY(8000),[cc])),120) FROM [dbo].[testdaterecover] DELETE [dbo].[testdaterecover] THEN CONVERT(VARCHAR(MAX), CONVERT(DATETIME, CONVERT(VARBINARY(8000), REVERSE(hex_Value))), 121) --DATETIME
2015-12-17 补充
注意：脚本中大量使用了reverse函数来进行转换，因为reverse函数的定义是返回字符串值的逆序，不是字节的逆序
那么就会导致有些数据类型是按字节逆序的，就会出错
WHEN system_type_id = 52 THEN CONVERT(VARCHAR(MAX), CONVERT(SMALLINT, CONVERT(BINARY(2), REVERSE (hex_Value))))
在SQL Server中，sys.fn_PhysLocFormatter这个函数也是使用reverse函数进行RID逆序，当遇到81-FE之间的字节时 被认为是双字节字符组合在一起参与逆序运算
所以得出来的某些结果也是错的，详细请参考《SQL Server性能调优实战》 P115
函数的逻辑是，每个字节加上相应的位数
比如 2这个数字是在第二个字节位置的，那么公式就是2*POWER(2,8) =512
相应进制
二进制后面加8个0
十六进制后面加2个0
只要学过计算机基础都不难理解的
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