SQL Server compressed log and database file size

Follow the steps to avoid damaging your database if you do not follow the previous steps.

Generally do not recommend to do 4th, 62 steps, 4th step unsafe, it is possible to damage the database or loss of data. 6th step if the log reaches the upper limit, subsequent database processing will fail, and the log will not be restored until it is cleaned.

1. Empty log

DUMP TRANSACTION Library name with NO_LOG

2. Truncate the transaction log

BACKUP LOG database name with NO_LOG

3. Shrink the database file (if not compressed, the database file will not be reduced

Enterprise Manager--right--the database you want to compress--all tasks--shrink the database--Shrink the file

--Select Log file--in the shrinkage method to choose to shrink to XXM, here will give a allow to shrink to the minimum m number, directly enter this number, you can determine

--Select the data file--in the contraction way to choose to shrink to XXM, here will give a allow to shrink to the minimum m number, directly enter this number, OK

You can also use SQL statements to complete

--Shrinking the database

DBCC shrinkdatabase (Customer information)

--Shrink the specified data file, 1 is the file number, you can query through this statement:

SELECT * FROM Sysfiles

DBCC Shrinkfile (1)

4. In order to maximize the reduction of log files (if it is SQL 7.0, this step can only be done in Query Analyzer)

A. Detaching a database:

Enterprise Manager--server--database--right key--detach database

B. Delete log files on my Computer

C. Additional databases:

Enterprise Manager--server--database--right Key--additional database

This method will generate a new log with a size of more than 500 k

or in code:

The following example separates pubs and attaches a file in pubs to the current server.

A. Separation

EXEC sp_detach_db @dbname = ' pubs '

B. Deleting a log file

C. Additional

EXEC sp_attach_single_file_db @dbname = ' pubs ',

@physname = ' C:/Program files/microsoft

SQL Server/mssql/data/pubs.mdf '

5. In order to be able to automatically shrink, do the following settings

Enterprise Manager--server--right key database--Properties--Options--select "Auto Shrink"

--sql Statement setting:

EXEC sp_dboption ' database name ',

' AutoShrink ', ' TRUE '

6. If you want to not let it grow too big log

Enterprise Manager--server--right key database--attribute--transaction log

--Limit file growth to XM (x is the maximum data file size you allow)

How the--sql statement is set:

ALTER DATABASE name modify file (name= logical filename, maxsize=20)