sql server logs in event viewer

Label:Why do we need transaction logs to delete or not add log files? The answer is no, if there is no transaction log, your database will not work at all!The transaction log supports the following operations:Transaction rollbackIf the user or program uses the ROLLBACK statement or the database detects a failed operation. These log files will be used for rollback.Redo Unfinished transactionsIf you restart the database

in the transaction log in order to remove 2MB 2 . Span style= "font-family: Arial" > (note that the status is 2 rows). ?If the transaction log is now backed up again, the transaction log will be truncated again, and now the active interval is the virtual log file 2 up. If I try to shrink the file again now, SQL Server it will successfully shrink to 2MB around, because the log's active range is cl

Because high-availability database servers may rarely shut down, SQL Server's log files will grow very large. In this way, it is difficult for DBA to use error log to find information, and the performance will be affected when the log is large. We usually think that error logs will be created when sqlserver is started, so you need to stop the log files to re-create the log files. Such maintenance is unim

A few days ago, I found that the query on the website is abnormal. Generally, the content of the first-level directory is queried first, and the second-level directory is queried after I click the first-level directory ...... Until the bottom file is found. However, these days, we found that the query speed was very slow, and the query results were not a level-1 directory, but directly showed the bottom file, and the data volume displayed was also problematic. At first, I thought the website

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 regularly 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

Some time ago, I sent an example of restoring MSSQL data through logs. To restore logs, the most important thing is: 1. A complete backup is required, and the backup must be performed before the data is modified or deleted. 2. Log backup is performed after data is updated and deleted. The log backup is used to restore the previous data. Purpose: To restore the deleted table Visual operation ste

How to clear SQL server logs Method 1: Step 1: Backup log database_name with no_log Or backup log database_name with truncate_only -- no_log and truncate_only are synonymous here. You can execute either of them. Step 2: 1. compress all data and log files of a specific database and execute DBCC shrinkdatabase (database_name, [, target_percent]) -- database_name

1. Delete Log 2. Clear the Log 3. Shrinking database files 4. truncating the transaction log The performance of the database is the DBA need to focus on, the increase of log files seriously affect the performance of the database, this article will introduce you to the SQL Server delete log files for your reference, I hope to help you.In the process of using the database, the log files are i

Project, there may be too many databases (SQL Server database) logs, which account for a lot of disk space, and can reduce the log file size by shrinking the database log.The following is an example of the Northwind database:1. Set the recovery model of the database to "Simple mode":Select the Northwind database-right-click Properties,In the Database Properties w

log to the SHUA2, which is the database right-click Task.If you fill in, first fill in the beginning of the backup log C:\shua_log.bak, and then tick [restore], the most important thing is to choose a point in time, but this point of time can not select milliseconds, so I chose 29 seconds, This time will restore the data 29 seconds ago, and my data is deleted from 29.88 seconds, so choose 29 seconds is duly completed; why didn't I choose 28 seconds? Because my database changes very much every s

Tags: blog using ar data div C on log R--1. Writes all dirty pages of the current database to disk. A dirty page is a page of data that has been entered into a buffer cache and has been modified but not yet written to disk. -- CHECKPOINT can create a checkpoint that guarantees that all dirty pages have been written to disk, saving time in a later recovery process. Checkpoint--2. To remove the purge buffer from the buffer pool, first use CHECKPOINT to generate a cold cache. This forces all dirt

database or cause data loss. 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. 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-cli

On an old Web server, the website ASP + SQLServer2000 was used. Since year 56, it has been used smoothly, so it has not been handled properly. On an old Web Server, the website ASP + SQL Server 2000 was used. Since year 56, it has been used smoothly, so it has not been handled properly. A few days ago, I found that t

Please follow these steps. Do not take the following steps if the previous steps are not performed to avoid damage to your database. Generally, steps 4 and 6 are not recommended. Steps 4 are not secure and may damage the database or cause data loss. If the log reaches the upper limit in step 1, subsequent database processing will fail and the log can be restored after being cleared. 1. Clear logs Dump transaction database name WITH NO_LOG 2. truncate

Previously thoughtSqlserverA full backup only backs up database data and does not contain logs. In fact, this is an error. UseRestoreheaderonlyCan help us verify (MSDB.DBO.Backupset also contains the corresponding information). Restore headeronlyReturns the result set that contains all backup header information of all backup sets on a specific backup device. The query result contains three columns: Firstlsn Numeric (25, 0)

A few days ago, I found that the query on the website is abnormal. Generally, the content of the first-level directory is queried first, and the second-level directory is queried after I click the first-level directory ...... Until the bottom file is found. However, these days, we found that the query speed was very slow, and the query results were not a level-1 directory, but directly showed the bottom file, and the data volume displayed was also problematic.At first, I thought the website was

1. View job History Select TOP [instance_id], [ job_id] , [step_id] , [step_name] , [sql_message_id] , [Sql_severity] , [message] , [run_status] , [run_date] , [run_time] , [run_duration] , [ Operator_id_emailed] , [operator_id_netsent] , [operator_id_paged] , [retries_attempted] , [ Server] from [msdb].[ DBO]. [Sysjobhistory] 2. Review the Maintenance plan log Select TOP [t

Misunderstanding #14. After clearing the log, the related LSN will be filled with zero Initialization Error When the log file grows manually, automatic growth, and creation are performed, it will be filled in with zero initialization. However, do not confuse this process with the regular log clearing process. Log truncation only means marking one or more VLF as inactive for reuse. During log clearing, no logs are cleared or 0 is entered. "Log cleari

Misunderstanding #19: operations on the Truncate table will not be loggedErrorOperations in the User table are recorded in logs. The only operation in SQL Server that is not logged is row Version Control in TempDB.The Truncate Table statement deletes all data in the entire Table. However, the deletion method is not to delete a row, but to release the data page of

." Layout.exceptionlayout " /> parameter> Appender> Root> Levelvalue= "All" /> Appender-refref= "Adonetappender" /> Root> log4net> 2. Create a syslogs table in the database 3.webConfig Configuration configsections > name= "log4net" type= "Log4net". Config.log4netconfigurationsectionhandler, log4net "/> configsections> configSource= " Log4net.config "/> 4. Setting Configuration items at application startup Global.asax protected void Application_Start ()