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After making changes in size of one or more of the components above, you will need to must restart the related component(s). If you define multiple alerts, you may want to increase the XMX-size of the Alerts FocalPoint and Informpoint. If you intend to create several reports, you may want to increase the XMX-size of the Report Manager FocalPoint. |
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Oracle-based PMDB configuration
This section is divided into information for Oracle 11g and 10g
Oracle 11g
In Oracle 11g the automated maintenance tasks infrastructure known as AutoTask enables Oracle to automatically schedule Automatic Maintenance Tasks. AutoTask schedules automatic maintenance tasks to run in a set of Oracle Scheduler windows known as maintenance windows. Maintenance windows are those windows that are members of the Oracle Scheduler window group MAINTENANCE_WINDOW_GROUP.
Oracle 11g includes three automated database maintenance tasks:
- Automatic Optimizer Statistics Collection - Gathers stale or missing statistics for all schema objects. The task name is
auto optimizer stats collection. - Automatic Segment Advisor - Identifies segments that could be reorganized to save space. The task name is
auto space advisor. Automatic SQL Tuning Advisor - Identifies and attempts to tune high load SQL. The task name is
sql tuning advisor.Info If you experience performance problems in Precise during the default maintenance times, we recommend to change the maintenance schedules or ask advice from your Oracle DBA.
It is recommended to use a block size of 16 Kbytes.
The provides recommended values for Oracle configuration. The following tables describe the Oracle-based PMDB configuration parameters and sizing recommendations that need to be inserted in the init.ora file for Oracle 11g:.
If Automatic Memory Management is not used, the following parameter values are recommended.
Table 6 Oracle 11g-based PMDB configuration parameters
| Parameter | Value |
|---|---|
MEMORY_TARGET | 45 GB |
MEMORY_MAX_TARGET | 45 GB |
LOG_BUFFER | 5 MB+ |
| SESSIONS | 1500 |
PROCESSES | 1000 |
UNDO_RETENTION | 7200 |
DB_WRITER_PROCESSES | 4 |
Table 7 Oracle 11g-based PMDB sizing recommendation
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If on a Linux server you get an ORA-845 error, you must mount /dev/shm needs to be mounted with its proper size. The size is directly influenced by the SGA size of your PMDB. If you set it too low you will get this errorThis error results when it is set too low.
To mount it, log in as a root user and use the following command: # mount -t tmpfs shmfs -o size=<SGA size> /dev/shm
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