Tag: enterprise manager

Database, Enterprise Manager

OEM Alarm – %MB of Audit Trail files (sizeOfOSAuditFiles:FILE_SIZE)

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Hello All,
After upgrading a OEM to 13c, I started to receive notifications for event “sizeOfOSAuditFiles:FILE_SIZE“.

This is a new event implemented on OEM DB Plugin 12.1.0.7.0 under “Operating System Audit Records” metric group. Upgrading DB Plugin was part of OEM Upgrade change once we had some old versioned.

This event is only a notification related to file size for space management ends. The default thresholds are 10MB (warning) and 20MB (critical), which in most of times it’s a pretty low value.
This is specifically related to location under parameter audit_file_dest if you want to check.

Between options to reduce the noise are disable this metric or increase thresholds accordingly, which was what I did.
At this moment, I just increased thresholds to 500MB/2048MB, which I consider good values for the environment.

Some reference about can be found at:
– Enterprise Manager Oracle Database Plug-in Metric Reference Manual (Plug-in Release 12.1.0.7) – Database Instance – Operating System Audit Records
– EM 12c, EM 13c: Troubleshooting Database Metrics in Enterprise Manager 12c and 13c Cloud Control (Doc ID 2032156.1)

Hope it helps,
Cheers!

Enterprise Manager

OEM Alarms: TaskZombieException

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Hello all,
Recently I started to have several alarms like this:

Internal error detected: java.lang.Throwable:oracle.sysman.gcagent.tmmain.execution.LongOpManager$ZombieDetection:1017.

Or

Internal error detected: oracle.sysman.gcagent.task.TaskZombieException:oracle.sysman.gcagent.task.TaskFutureImpl$WrappedTask:620.

In agent log the message:

# $AGENT_INST/sysman/log/gcagent.log:

2017-06-13 12:54:09,232 [355:GC.Executor.14 (oracle_database:DB_DB12:%DB%)] ERROR - oracle_database:DB_DB12:%DB% oracle.sysman.gcagent.task.TaskZombieException: task declared as a zombie
at oracle.sysman.gcagent.task.TaskFutureImpl$WrappedTask.accountedCall(TaskFutureImpl.java:620)
at oracle.sysman.gcagent.task.TaskFutureImpl$WrappedTask.call(TaskFutureImpl.java:643)
at java.util.concurrent.FutureTask$Sync.innerRun(FutureTask.java:303)
at java.util.concurrent.FutureTask.run(FutureTask.java:138)

To avoid generating pages and new incidents, I changed parameter _zombieCreateIncident to false on agents in related servers, as per described in MOS EM12c: Incident constantly raised for Oracle.sysman.gcagent.task.TaskZombieException: task declared as a zombie (Doc ID 2116834.1) regarding MOS Bug 22674258 – Zombie processes created for DB metric collection /workaround do not work.
I also added some other parameters that should help, like increasing the wait, all mentioned in same MOS notes.

Like this, in $AGENT_INST/sysman/config/emd.properties:

#GrepOra magical fixes:
_zombieSuspensions=true
_canceledThreadWait=900
_zombieThreadPercentThreshold=0
_zombieCreateIncident=false

And it solved the issue. At leat, the noise stopped. 🙂

Hope it helps,
Cheers!

Enterprise Manager

OEM 12c+: Prevent OMS from Sending Old Notifications for Events

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Are you receiving old notifications from OEM? Like 2 or 3 days past, mostly already solved or after a blackout?
Yeah, this is annoying, specially when getting floods and floods of notifications.

Ok, so here go a very good tip: You can set grace period for notifications! 🙂
Easy easy, do this way:

cd /bin
emctl set property -name oracle.sysman.core.notification.grace_period -value [provide value in minutes]

The oracle.sysman.core.notification.grace_period OMS parameter has been introduced in 12c and allows the user to configure the grace period within which the notification should be sent. The value is set in minutes.

For example:

emctl set property -name oracle.sysman.core.notification.grace_period -value 1440

With this, OMS sends only those notifications which have been raised in the past 1440 mins (last 24 hours) and ignores all the notifications for events / incidents created prior to this time period.

After this, you’ll need to start OMS:

emctl start oms

The oracle.sysman.core.notification.grace_period parameter applies to all the Notification methods, but if the requirement is to specify the grace period for a particular notification method only, you can use the below parameters accordingly:

oracle.sysman.core.notification.grace_period_connector: For Connectors
oracle.sysman.core.notification.grace_period_email: For email notifications
oracle.sysman.core.notification.grace_period_oscmd: For OS Command notifications
oracle.sysman.core.notification.grace_period_plsql: For PLSQL notifications
oracle.sysman.core.notification.grace_period_snmp: For SNMP Trap notifications
oracle.sysman.core.notification.grace_period_ticket: For ticketing tools

This is weel described as per MOS: 12c Cloud control: How to Prevent OMS from Sending out Old Notifications for Events / Incidents Occurred in the Past? (Doc ID 1605351.1)

Cheers!

Database, Enterprise Manager, Errors and Bugs

EM Repository: ORA-00060: Deadlock detected error in alert log

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Hello!
Some time ago I found some ORA-00060: Deadlock detected. errors in a client OEM database… Like this:

Thu Dec 22 09:01:55 2016
ORA-00060: Deadlock detected. More info in file /oracle/oemdb/diag/rdbms/oemdb/oemdb/trace/oemdb_ora_1757.trc.
Thu Dec 22 09:02:07 2016
ORA-00060: Deadlock detected. More info in file /oracle/oemdb/diag/rdbms/oemdb/oemdb/trace/oemdb_ora_1759.trc.
ORA-00060: Deadlock detected. More info in file /oracle/oemdb/diag/rdbms/oemdb/oemdb/trace/oemdb_ora_1759.trc.

In summary, after investigating the trace (as per below), found that the issueis caused by the following command:

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