{"id":15002733,"url":"https://github.com/ap0405140/mssqlloganalyzer","last_synced_at":"2026-06-12T03:01:48.489Z","repository":{"id":53086076,"uuid":"245790425","full_name":"ap0405140/MSSQLLogAnalyzer","owner":"ap0405140","description":"Microsoft SQL Server Log Analyzer. DBLOG.DatabaseLogAnalyzer can read the SQL Server transaction logs online, and return RedoSQL and UndoSQL for every transaction. 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It base on SQL Server sys.fn_dblog() function and develop some extension. \n\n#### below is a use demo:\nConnect to SQL Server, create a table dbo.OrderDetail, and run some sql on this table.\n~~~~sql\n-- create table\ncreate table dbo.OrderDetail\n(\n OrderID int not null,\n ItemID int not null,\n ItemNumber varchar(10),\n QTY int,\n Price decimal(8,2),\n ADate date,\n AUser char(20),\n UDate datetime,\n UUser varchar(20)\n constraint pk_OrderDetail primary key(OrderID,ItemID)\n)\n\n-- transaction1: insert 3 rows\ninsert into dbo.OrderDetail(OrderID,ItemID,ItemNumber,QTY,Price,ADate,AUser,UDate,UUser)\n  select 1001,1,'D001',100,45.62,'2015-01-02','Xh6','2015-01-03 20:15:18','Lx4' union all\n  select 1001,2,'Z001_2',150,180,'2015-01-02','cx5','2015-01-08 02:45:32','Yx3' union all\n  select 1002,1,'Z001_2',300,182.07,'2015-12-12','CL1','2015-12-18 02:45:32','LY6'\n\n-- transaction2: update 1 row\nupdate dbo.OrderDetail set QTY=999 where OrderID=1001 and ItemID=1\n\n-- transaction3: update 3 rows\nupdate dbo.OrderDetail set ItemNumber='!@#$%'\n\n-- transaction4: delete all rows\ndelete from dbo.OrderDetail\n\n-- transaction5: drop table\ndrop table dbo.OrderDetail\n~~~~\nAfter run, there is no table in the database.\n~~~~sql\n select * from dbo.OrderDetail\n~~~~\n![pic1](images/demo01.png)\n\n**Right now, we can use this tool to recover data online(no need to restore database and logs).**\n**Please download zip file in Releases, and extract files to a folder.**\n\n**step1: Execute MSSQLLogAnalyzer.exe.**\n\n**step2: Modify [ConnectionString], change it for your environment.**\n\n\u0026nbsp;\u0026nbsp;\u0026nbsp;\u0026nbsp;\u0026nbsp;\u0026nbsp;\u0026nbsp;\u0026nbsp;\u0026nbsp;\u0026nbsp;\u0026nbsp;\u0026nbsp;**Modify [StartTime] and [EndTime] to what time range need to read logs.**\n\n\u0026nbsp;\u0026nbsp;\u0026nbsp;\u0026nbsp;\u0026nbsp;\u0026nbsp;\u0026nbsp;\u0026nbsp;\u0026nbsp;\u0026nbsp;\u0026nbsp;\u0026nbsp;**Modify [TableName], It can  be blank, when blank means read all table logs.**\n\n**step3: Click [Readlog] button, wait for analysis results. below screenshot is the run result.**\n\n![pic2](images/demo02.png)\n**After run finished, It returned some RedoSQL and UndoSQL for every transaction, For recovery,  we can use UndoSQL to recover all operations (execute from the back forward).**\n~~~~sql\n-- recover transaction5(drop table)\ncreate table [dbo].[OrderDetail]\n([OrderID] int not null,\n [ItemID] int not null,\n [ItemNumber] varchar(10) collate Chinese_PRC_CI_AS null,\n [QTY] int null,\n [Price] decimal(8,2) null,\n [ADate] date null,\n [AUser] char(20) collate Chinese_PRC_CI_AS null,\n [UDate] datetime null,\n [UUser] varchar(20) collate Chinese_PRC_CI_AS null\n constraint [pk_OrderDetail] primary key clustered ([OrderID] asc,[ItemID] asc) \n); \n\n-- recover transaction4(delete all rows)\ninsert into [dbo].[OrderDetail]([OrderID],[ItemID],[ItemNumber],[QTY],[Price],[ADate],[AUser],[UDate],[UUser]) values(1002,1,'!@#$%',300,182.07,'2015-12-12','CL1','2015-12-18 02:45:32.000','LY6'); \ninsert into [dbo].[OrderDetail]([OrderID],[ItemID],[ItemNumber],[QTY],[Price],[ADate],[AUser],[UDate],[UUser]) values(1001,2,'!@#$%',150,180.00,'2015-01-02','cx5','2015-01-08 02:45:32.000','Yx3'); \ninsert into [dbo].[OrderDetail]([OrderID],[ItemID],[ItemNumber],[QTY],[Price],[ADate],[AUser],[UDate],[UUser]) values(1001,1,'!@#$%',999,45.62,'2015-01-02','Xh6','2015-01-03 20:15:18.000','Lx4'); \n\n-- recover transaction3(update 3 rows)\nupdate top(1) [dbo].[OrderDetail] set [ItemNumber]='Z001_2' where [OrderID]=1002 and [ItemID]=1; \nupdate top(1) [dbo].[OrderDetail] set [ItemNumber]='Z001_2' where [OrderID]=1001 and [ItemID]=2; \nupdate top(1) [dbo].[OrderDetail] set [ItemNumber]='D001' where [OrderID]=1001 and [ItemID]=1; \n\n-- recover transaction2(update 1 row)\nupdate top(1) [dbo].[OrderDetail] set [QTY]=100 where [OrderID]=1001 and [ItemID]=1; \n~~~~\nQuery recovery result:\n~~~~sql\n select * from dbo.OrderDetail\n~~~~\n![pic3](images/demo03.png)\n\u003cbr/\u003e\n**Recovery finished!**\n\n----\n#### Some Tips:\n#### 1. The SQL Server to be analyzed needs 2008 or later version.\n#### 2. Target Database Recovery model must be 'Full'.\n#### 3. This module only analyzes for DML and DDL transaction.\n#### 4. For develop, please install Visual Studio 2017 or later version and .NET Framework 4.8.\n#### 5. Please contact me when have any question: ap0405140@163.com\n#### 6. This project is open source, welcome to contribute code or give me some advice to make it better.\n#### 7. This project use GPL-3.0 license, For commercial use or to obtain a commercial license, please contact the author.\n----\n\n#### SQLCLR use example:\nDeployment to SQLServer with SQLCLR, then we can use a SQL Function to readlog in SQL Server Management Studio.\n~~~~sql\nuse master;\n\n-- enable clr\nexec sys.sp_configure 'clr enabled';\n\nexec sys.sp_configure 'clr enabled',1;\n\nreconfigure;\n\n-- set database trustworthy on\nalter database [DatabaseName] set trustworthy on;\n\n-- open database\nuse [DatabaseName];\n\n-- create assembly\nif exists(select 1 from sys.assemblies where name=N'System.ComponentModel.DataAnnotations')\n   drop assembly [System.ComponentModel.DataAnnotations];\n\ncreate assembly [System.ComponentModel.DataAnnotations]\n from 'C:\\Windows\\Microsoft.NET\\Framework64\\v4.0.30319\\System.ComponentModel.DataAnnotations.dll'\n with permission_set=unsafe;\n\nif exists(select 1 from sys.assemblies where name=N'System.Runtime.Serialization')\n   drop assembly [System.Runtime.Serialization];\n\ncreate assembly [System.Runtime.Serialization]\n from 'C:\\Windows\\Microsoft.NET\\Framework64\\v4.0.30319\\System.Runtime.Serialization.dll'\n with permission_set=unsafe;\n\nif exists(select 1 from sys.assemblies where name=N'FCLR')\n   drop assembly FCLR;\n\ncreate assembly FCLR \n from 'D:\\github\\MSSQLLogAnalyzer\\FCLR\\bin\\Release\\FCLR.dll' --\u003e change the path for your environment.\n with permission_set=unsafe;\n\nalter assembly FCLR \n add file from 'D:\\github\\MSSQLLogAnalyzer\\FCLR\\bin\\Release\\FCLR.pdb'; --\u003e change the path for your environment.\n\n-- create function\nif exists(select 1 from sys.objects where name=N'DBAReadLog')\n   drop function dbo.DBAReadLog;\n\ncreate function dbo.DBAReadLog\n(\n @connectionstring nvarchar(max),\n @dt0 nvarchar(max),\n @dt1 nvarchar(max),\n @obj nvarchar(max)\n)\nreturns table\n(\n  LSN nvarchar(max),\n  Type nvarchar(max),\n  TransactionID nvarchar(max),\n  BeginTime nvarchar(max),\n  EndTime nvarchar(max),\n  ObjectName nvarchar(max),\n  Operation nvarchar(max),\n  RedoSQL nvarchar(max),\n  UndoSQL nvarchar(max),\n  Message nvarchar(max)\n)\nas external name FCLR.UserDefinedFunctions.DBAReadLog;\n\n\n-- read log\nselect * \nfrom dbo.DBAReadLog(N'server=[ServerName];database=[DatabaseName];uid=[LoginName];pwd=[Password];Connection Timeout=5;Integrated Security=false;',  -- Database connection string\n                    N'2026/05/11 15:47:00',  --StartTime\n                    N'2026/05/11 15:47:59',  --EndTime\n                    null) t  --TableName, Need include schema name(like dbo.Table1), When blank or null means query all tables logs.\norder by TransactionID,LSN;\n~~~~\n![pic4](images/demo04.png)\n\u003cbr/\u003e\n----\n\n#### DBLOG.dll use example:\nstep1: Start Visual Studio 2022, create a new project.\n\nstep2: Add reference DBLOG.dll to current project.\n\nstep3: At cs file header, add \"using DBLOG;\"\n\nstep4: Call DatabaseLogAnalyzer.ReadLog() for read logs.\n\n```csharp\n string ConnectionString, StartTime, EndTime, TableName;\n DatabaseLogAnalyzer dbla;\n DatabaseLog[] logs;\n\n //connection string: Please change below connection string for your environment.\n ConnectionString = \"server=[ServerName];database=[DatabaseName];uid=[LoginName];pwd=[Password];Connection Timeout=5;Integrated Security=false;\";\n //start time for analyze, format: yyyy-MM-dd HH:mm:ss\n StartTime = \"2020-03-18 10:01:02\"; \n //end time for analyze, format: yyyy-MM-dd HH:mm:ss\n EndTime = \"2020-03-18 10:02:02\"; \n //table name: Need include schema name(like dbo.Table1), When blank means query all tables 's logs, you can change it for need.\n TableName = \"\"; \n\n  // Initializes a new instance of the DBLOG.DatabaseLogAnalyzer class.\n  dbla = new DatabaseLogAnalyzer(ConnectionString);  \n  // read logs, return a DatabaseLog array, include below properties:LSN,TransactionID,BeginTime,EndTime,ObjectName,Operation,RedoSQL,UndoSQL.\n  logs = dbla.ReadLog(StartTime, EndTime, TableName); \n```\n\n## Star History\n\n\u003ca href=\"https://www.star-history.com/?repos=ap0405140%2FMSSQLLogAnalyzer\u0026type=date\u0026logscale=\u0026legend=top-left\"\u003e\n \u003cpicture\u003e\n   \u003csource media=\"(prefers-color-scheme: dark)\" srcset=\"https://api.star-history.com/chart?repos=ap0405140/MSSQLLogAnalyzer\u0026type=date\u0026theme=dark\u0026legend=top-left\" /\u003e\n   \u003csource media=\"(prefers-color-scheme: light)\" srcset=\"https://api.star-history.com/chart?repos=ap0405140/MSSQLLogAnalyzer\u0026type=date\u0026legend=top-left\" /\u003e\n   \u003cimg alt=\"Star History Chart\" src=\"https://api.star-history.com/chart?repos=ap0405140/MSSQLLogAnalyzer\u0026type=date\u0026legend=top-left\" /\u003e\n \u003c/picture\u003e\n\u003c/a\u003e\n","project_url":"https://awesome.ecosyste.ms/api/v1/projects/github.com%2Fap0405140%2Fmssqlloganalyzer","html_url":"https://awesome.ecosyste.ms/projects/github.com%2Fap0405140%2Fmssqlloganalyzer","lists_url":"https://awesome.ecosyste.ms/api/v1/projects/github.com%2Fap0405140%2Fmssqlloganalyzer/lists"}