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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. $

The number of logical I/Os (for a discussion on logical I/Os, see the section Logical and Physical I/O in 2) is 8 (the sum of totals for the current column, 0, and the query column, 8).

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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.

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.

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.

The relevant portion of the tkprof output for _demoPstmtFetchSizeWithRsetOverride() is as follows: select x /*+(CONN=5)(PSTMT=20)(RSET=50)*/ from t1 where rownum <= :1 call count ------- -----Parse 1 Execute 1 Fetch 3 ------- -----total 5 cpu elapsed disk query current -------- ---------- ---------- ---------- ---------0.00 0.00 0 0 0 0.00 0.00 0 0 0 0.00 0.00 0 6 0 -------- ---------- ---------- ---------- ---------0.00 0.01 0 6 0 rows ---------0 0 100 ---------100

If you are using the Oracle SQL*Plus interface on Windows, you can change the environment variables for your session by using the Options menu and choosing Environment. You are shown all the current environment variables for your session, and you can modify them as long as you stay within the limits. If you are logged into SQL*Plus through a UNIX server s X Window Session, you lose this easy way to change the values of your environment variables.

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