MSSQL log processing transaction log processing

Three methods:

1. Delete log

1): Choose "detach Database"> "server"> "Database"> "right-click"> "detach Database ".
2): delete log files.
3): attach the database to the Enterprise Manager. Choose Server> database> right-click and choose attach database.

This method generates a new log with a size of more than 500 kb.

Then set the database to automatically contract

2. Clear logs

Dump transaction database name with no_log

Again: Enterprise Manager -- Right-click the database you want to compress -- all tasks -- contract database -- contract file -- Select log file -- select to contract to xxm in the contract mode, here we will provide a minimum number of M that can be reduced. Enter this number directly and click OK.

3. If you want to prevent it from increasing in the future

Enterprise Manager-> server-> database-> properties-> transaction log-> limit file growth to 2 MB

Quick solutions for full SQL Server database logs

First, a complex method is provided to compress logs and database files as follows:

1. Clear logs
Dump transaction database name with no_log
2. truncate transaction logs:
Backup log database name with no_log
3. Compress database files (if not compressed, the database files will not be reduced
Enterprise Manager -- Right-click the database you want to compress -- all tasks -- contract database -- contract file
-- Select log file -- select to shrink to xxm in the contraction mode. Here, a minimum number of MB allowed to be shrunk is displayed. Enter this number directly and click OK.
-- Select data file -- select to shrink to xxm in the contraction mode. Here, a minimum number of MB allowed to be shrunk is displayed. Enter this number directly and click OK.
You can also use SQL statements to complete
-- Shrink Database
DBCC shrinkdatabase (customer profile)
-- Contract the specified data file. 1 is the file number. You can use this statement to query: Select * From sysfiles
DBCC shrinkfile (1)
4. To minimize log files (for SQL 7.0, this step can only be performed in the query analyzer)
A. Separate the database:
Enterprise Manager -- server -- database -- Right-click -- detach Database
B. Delete log files in my computer
C. Additional database:
Enterprise Manager -- server -- database -- Right-click -- attach Database
This method generates a new log with a size of more than 500 K.
Or use 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. Delete log files
C. Attach
Exec sp_attach_single_file_db @ dbname = 'pubs ',
@ Physname = 'C: \ Program Files \ Microsoft SQL Server \ MSSQL \ data \ pubs. MDF'
5. In order to automatically contract in the future, make the following settings:
Enterprise Manager -- server -- Right-click Database -- Property -- option -- select "auto contract"
-- SQL statement setting method:
Exec sp_dboption 'database name', 'autowrite', 'true'
6. If you want to prevent the log from increasing too much in the future
Enterprise Manager -- server -- Right-click Database -- properties -- transaction log
-- Limit file growth to xm (X is the maximum data file size you allow)
-- SQL statement settings:
Alter database name Modify file (name = logical file name, maxsize = 20)
Note:
Follow these steps. Do not follow these steps.
Otherwise, your database may be damaged.
Generally, steps 4 and 6 are not recommended.
Step 3 is not safe, and may damage the database or lose data
If the log reaches the upper limit in step 1, the subsequent database processing will fail and the log can be restored after being cleared.

In addition, we provide a simpler method, which I have tried and tried repeatedly. We recommend that you use it.
Simpler Method:
1. Right-built Database Properties window-fault recovery model-set to simple
2. Right-built database all tasks-shrink Database
3. Right-built Database Properties window-fault recovery model-set as large-capacity log records