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DM8 archive log file manual switching
2022-07-06 03:54:00 【Song Xiaorong】
Archive log switch
Here, the database is used as a stand-alone , For example, local archiving has been enabled , Test the switching of archive log files .
Because the local archive is written to the archive log file asynchronously ,REDO The log is written to the online log file , Then, a special archiving thread is responsible for these REDO The log is written to the local archive log file . Switch functions through archiving , These can be written to the online log file , Those that have not been written to the archive log file REDO journal , Write to archive log file .
Perform the following SQL command , The archive switching function can be completed . Three sentence function system , When switching manually, you only need to select one to execute . This chapter will test from these three statements .
SQL>alter database archivelog current;
SQL>alter system archive log current;
SQL>alter system switch logfile;
Before the test , We use the following statement to query the archived log file information .
SQL>select t.STATUS, t.PATH, t.ARCH_LSN, t.CLSN from "V$ARCH_FILE"t;
The results are as follows , You can see the... In the database 16 Archive files are active , The description is that this file is an archive log file in use .
Mode one (alter database archivelog current)
Do some simple inserts 、 Delete or create tables and other data operations , Use the following command to switch archiving :
SQL>alter database archivelog current;
Query again V$ARCH_FILE You can see the 16 Files have been INACTIVE state .
Wait a moment to inquire , You can see the generation of 17 Archive files , Status as ACTIVE.
Mode two (alter system archive log current)
Delete the table you just created , Or simply insert 、 to update 、 Delete table data and other database operations , Use the following command to switch archiving :
SQL>alter system archive log current;
Query again V$ARCH_FILE You can see the 17 Files have been INACTIVE state .
Wait a moment to inquire , You can see the generation of 18 Archive files , Status as ACTIVE.
Mode three (alter system switch logfile)
Do some simple inserts 、 Delete or create tables , Then use the following command to switch archiving :
SQL>alter system switch logfile;
Query after operation V$ARCH_FILE, You can see the 18 Files have been INACTIVE state .
Wait a moment to inquire , You can see the generation of 19 Archive files , Status as ACTIVE.
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