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The archiver process is in charge of archiving the filled redo logs. It reads the control files to find out if there are any unarchived redo logs that are full, and then it checks the redo log headers and blocks to make sure they re valid before archiving them. You may have archiving-related problems if you re in the archive log mode but the archiver process isn t running for some reason. In this case, you need to start the archiver process by using the following command: SQL> ALTER SYSTEM ARCHIVE LOG START; If the archiver process is running but the redo logs aren t being archived, then you may have a problem with the archive log destination, which may be full. This causes the archiver process to become stuck, as you ll learn in the next section.
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When the archiver process is stuck, all database transactions that involve any changes to the tables can t proceed any further. You can still perform SELECT operations, because they don t involve the redo logs. If you look in the alert log, you can see the Oracle error messages indicating that the archiver process is stuck due to lack of disk space. You can also query the V$ARCHIVE view, which holds information about all the redo logs that need archiving. If the number of these logs is high and increasing quickly, you know your archiver process is stuck and that you need to clear it manually. Listing 20-20 shows the error messages you ll see when the archiver process is stuck. Listing 20-20. Database Hang Due to Archive Errors $ sqlplus system/system_passwd ERROR: ORA-00257: archiver error. Connect internal only, until freed. $ $ oerr ora 257 00257, 00000, "archiver error. Connect internal only, until freed." //*Cause: The archiver process received an error while trying to // archive a redo log. If the problem is not resolved soon, the // database will stop executing transactions. The most likely cause // of this message is the destination device is out of space to // store the redo log file. // *Action: Check archiver trace file for a detailed description // of the problem. Also verify that the device specified in the // initialization parameter ARCHIVE_LOG_DEST is set up properly for // archiving. $
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CHAPTER 20 PERFOR MAN CE TUNING: TUNING THE INSTA NCE
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You can do either of the following in such a circumstance: Redirect archiving to a different directory. Clear the archive log destination by removing some archive logs. Just make sure you back up the archive logs to tape before removing them. Once you create more space in the archive log directory, the database resumes normal operations, and you don t have to do anything further. If the archiver process isn t the cause of the hanging or frozen database problem, then you need to look in other places to resolve the problem. If you see too many checkpoint not complete messages in your alert log, then the archiver process isn t causing the problem. The redo logs are causing the database slowdown, because they re unable to keep up with the high level of updates. You can increase the size of the redo logs online to alleviate the problem.
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The database logs all connections as SYS in the default audit trail, which is usually the $ORACLE_HOME/ rdbms/audit directory. If you don t have adequate space in that directory, it may fill up eventually, and you ll get an error when you try logging in as the SYS user. Delete the old audit trail files or choose an alternative location for them.
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You need to check several things to make sure there are no major problems with the I/O subsystem or with the CPU usage. Here are some of the important things you need to examine: Make sure your system isn t suffering from a severe paging and swapping problem, which could result in a slower-performing database. Use top, sar, vmstat, or similar operating-system level tools to check resource usage. Large queries, sorting, and space management operations could all lead to an increase in CPU usage. Runaway processes and excessive snapshot processes (SNPs) could gobble excessive CPU resources. Monitor any replication (snapshot) processes or DBMS_JOB processes, because they both use resource-hungry SNP processes. If CPU usage spikes, make sure no unexpected jobs are running in the database. Even if no jobs are executing currently, the SNP processes consume a great deal of CPU because they have to query the job queue constantly. High run queues indicate that the system is CPU bound, with processes waiting for an available processor. If your disk I/O is close to or at 100 percent and you ve already killed several top user sessions, you may have a disk controller problem. For example, the 100 percent busy disk pack might be using a controller configured to 16-bit, instead of 32-bit like the rest of the controllers, causing a severe slowdown in I/O performance.
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