Martin Klier


Disabling (or enabling) general job execution in Oracle 10g

Hi, disabling and enabling job execution in Oracle DB has two ways: If you are using dbms_jobs, it’s handy to set job_queue_processes to zero to disable the execution of jobs, and set it to a value >0 (maybe 100) to enable. If you are using dbms_scheduler, this parameter does not work for you. You will […]

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Find out your character set in Oracle DB

Hi, since ‘show parameter’ does not tell you your database charset, use this statement to see how your characters are stored: select * from nls_database_parameters where parameter=’NLS_CHARACTERSET’; Regards Usn […]

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Oracle Database with SGA of or larger than 16GB

Hi, using large SGA’s requires 64bit Oracle RDBMS, of course. But furthermore, some OS settings are to be done. SUSE walks it’s own lane, quite as usual, so I will provide two ways for doing without ORA-27102. […]

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Oracle 10gR2 Clusterware on Novell/SuSE SLES10 on multipath devices

Hi RAC-DBAs, installing the Oracle Clusterware CRS 10.2 on SLES10 with its multipath devices can be tricky. Background: The tool formatting the OCR disks, clsfmt.bin, is buggy concerning multipath / device mapper devices and you will see root.sh fail and clsfmt spit out errors like: clsfmt: Failure trying to resize OCR file from … bytes […]

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Lecture “Highly available Communications Server” (Oracle Database) at DOAG conference 2007

Hi, I’ll give a lecture about high availability with Oracle RAC and Dataguard at DOAG Conference 2007 (annual conference of the German Oracle User’s Group). The talk will be in German. (“Ein hochverfügbarer Kommunikationsserver mit RAC, ASM, redundant shared media und DataGuard”) When? Thursday, November 22nd 2007 1300hrs Where? CCN CongressCenter Nürnberg Ost Messezentrum D-90471 […]

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Scheduler hangs in Oracle Database 10g

Hi, sometimes the 10g scheduler refuses to start jobs any more. I do not know why at the moment, but as a workaround you can just kill -9 the “coordinator job queue (CJQ0)” process from OS level. The process will be named like “ora_cjq0_SID” in a RAC. PMON does a restart of the coordinator after […]

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How to fail over a client transparently in a dataguard switchover/failover scenario

Hi, with using dataguard (Oracle’s hot/cold standby database solution) you have the challenge to make a failover or a roleswitch between the primary and the standby database transparent to the clients. If you don’t, you will have a (partially) loss of service: Clients tnsnames.ora’s will need reconfiguration or the application has to use another TNS […]

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Lost, deleted or corrupted a voting disk (quorum) in Oracle RAC 10.2 ?

Hi Folx, whenever you lost, deleted or corrupted a quorum aka voting disk in Oracle Real Application Cluster (RAC) 10.2, you have three options: 1) Reinstall your Clusterware, see Metalink Note 279793.1 2) Replay a backup taken with “dd if=/dev/votingdisk of=/backup/votingfile bs=4k” 3) Have a look at Metalink Note 399482.1 and the RAC Administration and […]

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