During usage, we often encounter very large database logs. Here we introduce two solutions ......
Method 1
In general, the contraction of the SQL database does not greatly reduce the size of the database. Its main function is to shrink the log size. This operation should be performed on a regular basis to avoid excessive database logs.
1. Set database mode to simple mode: Open the SQL Enterprise Manager, in the root directory of the console, open Microsoft SQL Server --> SQL Server group --> double-click your server --> double-click to open the database directory --> select your database name (such as the Forum database) forum) --> then right-click and select Properties --> Select Options --> select "simple" in the fault recovery mode, and click OK to save
2. Right-click the current database to view the shrinking database in all tasks. Generally, the default settings in the database do not need to be adjusted. Click OK directly.
3. After shrinking the database, we recommend that you set your database attributes to the standard mode. The operation method is the same as the first one, because logs are often an important basis for restoring the database in case of exceptions.
Method 2
Set nocount on Declare @ logicalfilename sysname, @ Maxminutes int, @ Newsize int Use tablename -- Name of the database to be operated Select @ logicalfilename = 'tablename _ log', -- Log File Name @ Maxminutes = 10, -- limit on time allowed to wrap log. @ Newsize = 1 -- the size of the log file you want to set (m) -- Setup/initialize Declare @ originalsize int Select @ originalsize = size From sysfiles Where name = @ logicalfilename Select 'original size of '+ db_name () + 'Log is' + Convert (varchar (30), @ originalsize) + '8 K pages or '+ Convert (varchar (30), (@ originalsize * 8/1024) + 'mb' From sysfiles Where name = @ logicalfilename Create Table dummytrans (Dummycolumn char (8000) not null) Declare @ counter int, @ Starttime datetime, @ Trunclog varchar (255) Select @ starttime = getdate (), @ Trunclog = 'backup log' + db_name () + 'with truncate_only' DBCC shrinkfile (@ logicalfilename, @ newsize) Exec (@ trunclog) -- Wrap the log if necessary. While @ maxminutes> datediff (MI, @ starttime, getdate () -- time has not expired And @ originalsize = (select size from sysfiles where name = @ logicalfilename) And (@ originalsize * 8/1024)> @ newsize Begin -- outer loop. Select @ counter = 0 While (@ counter <@ originalsize/16) and (@ counter< 50000 )) Begin -- Update Insert dummytrans values ('fill log ') Delete dummytrans Select @ counter = @ counter + 1 End Exec (@ trunclog) End Select 'final size of '+ db_name () + 'Log is' + Convert (varchar (30), size) + '8 K pages or '+ Convert (varchar (30), (size * 8/1024) + 'mb' From sysfiles Where name = @ logicalfilename Drop table dummytrans Set nocount off |