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As mentioned earlier, in addition to the number of active user sessions, the period of time for which you want to retain the AWR data and the snapshot interval are the key determinants of the volume of statistics retained in the Sysaux tablespace You can change the retention time period with the RETENTION parameter and the snapshot interval with the INTERVAL parameter Here are some details on the role of these two important parameters in snapshot creation and maintenance: RETENTION: As you know, the default retention period for AWR statistics is seven days The minimum retention period is one day The longer the retention period, the more space the AWR will need in the Sysaux tablespace However, if there is no room in the Sysaux tablespace, that fact will override all other retention settings Oracle will start deleting snapshots, overwriting the oldest ones first with new data.

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INTERVAL: By default, the AWR collects data every 60 minutes, and the minimum interval value is 10 minutes The more frequently you schedule the AWR snapshots, the more data the AWR will collect; the less frequent the AWR snapshots, the greater the chance that you may miss short bursts in disk or memory usage that may occur in your database You can use the DBMS_WORKLOAD_REPOSITORY package to modify the snapshot settings, as shown here: SQL> BEGIN DBMS_WORKLOAD_REPOSITORYMODIFY_SNAPSHOT_SETTINGS( RETENTION => 43200, INTERVAL => 30, DBID => 3310949047); END; Oracle recommends that you make the retention period the same as your database workload cycle If your database is like many typical OLTP databases, you probably have OLTP transactions throughout the weekdays, with batch jobs scheduled during nights and weekends.

If this is the case, your workload is considered to span a week, in which case the default AWR retention period of seven days is just fine..

You start the xterm via the -ls and -T switches. The -ls switch qualifies the shell within the window as a login shell and thus gives the full root user environment. The -T switch changes the title bar to the value following the switch. Then the PID variable is set to the xterm s process ID. Finally, the script sets up an at job, which is a scheduled task (somewhat different from a cron job, as seen in 12) that will kill the PID after one hour. The at command specifies a job to run once at the specified time. The time can be specific such as in the form of HH:MM or relative as in now + 1 hour. See the at man page for more specifics on its use.

If you set the value of the RETENTION parameter to 0, you disable the automatic purging of the AWR. If you set the value of the INTERVAL parameter to 0, you disable the automatic capturing of AWR snapshots.

If the assembly is not found there, it searches for a subdirectory of the base directory that is named after the simple name of the requested assembly For the SampleLib assembly, the assembly resolver would try to find the assembly in a subdirectory named SampleLib Unless you provide extra configuration, no further subdirectories of the application base directory will be inspected by the assembly resolver If you need to configure the assembly resolver to search for assemblies in further subdirectories of the application base directory, you can create an application configuration file as follows: <!-- MyApplicationexeconfig --> < xml version="10" > <configuration> <runtime>.

Oracle provides a script named awrrpt.sql (located in the $ORACLE_HOME/rdbms/admin directory) to generate summary reports about the statistics collected by the AWR facility. The results of running the awrrpt.sql script are very similar to the output of the traditional Statspack reports. In order to run an AWR report, you must have the DBA privilege.

Make sure you don t confuse the AWR report with the ADDM report that you obtain by running the addmrpt.sql script. The ADDM report is also based on the AWR snapshot data, but it highlights both the problems in the database and the recommendations for resolving them.