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ORA-00600: internal error code, arguments: [ktuUnReasonableScn]

 Problem:On a 19c Active dataguard DB I started to see the following internal error in the alertlog:ORA-00600: internal error code, arguments: [ktuUnReasonableScn], [10600], [6618907808447], [ktbgcl1],...

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Script For Killing Long Running Queries Running From Specific Programs By...

 On Apr 21, 2018 I've published a shell script to kill long-running sessions in Oracle DB connecting from specific MODULES and running longer than x number of minutes. I've revisited the script, adding...

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DBA BUNDLE 7.2 [Septemper 2022]

 Since a while I didn't release the new version of the DBA BUNDLE, each time I promote a new feature a new feature comes to my mind which makes me delay the announcement until I promote the new...

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ORA-03135: connection lost contact in the alert log of a Primary DB

Problem:The following error was keep coming in the alertlog of a 19c Primary DB having a standby DB:ORA-03135: connection lost contact Analysis:The logfile contains the following error, which refers to...

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PLS-00306: wrong number or types of arguments in call to 'SWITCH_DESTINATION'...

Problem:On a 19c DB having remote AWR configured on the ADG standby DB, I had the below error when trying to SWITCH OVER destination as per Oracle documentation in order to allow the automatic AWR...

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ORA-19909: datafile 1 belongs to an orphan incarnation, After Recovering the...

Scenario: On a 19.5 DB, I've opened the Standby in Read Write mode (ACTIVATED not SNAPSHOT mode) for testing purpose for 24 hours, which make it lag too way behind the primary and needs shipping of 700...

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ORA-00314, After Recovering the Standby DB from Service

Problem: On a 19.5 standby DB, I wanted to quickly recover it due to long lag using RECOVER STANBDY DATABASE FROM SERVICE command without the need to wait for the archivelogs to be transferred, but I...

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Remove "XDB initialized" from alertlog

 Problem: There is an unpublished Bug 29845449 in Oracle 19c, causing the following message to be written frequently in the DB alertlog:2022-10-12T13:42:54.212579+00:00XDB...

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ORA-03113: end-of-file on communication channel as a result of enabling bug...

Problem:On an ERP database, a Select query was keep getting terminated with the following error: ERROR at line 3:ORA-03113: end-of-file on communication channelAnalysis:Long time back we enabled...

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DBA BUNDLE 7.3 is Now Available [October 2022]

 I've finished the new DBA Bundle release of this month, Here are the new features:To download DBA BUNDLE 7.3:https://www.dropbox.com/s/le5pxctq0w6v49u/DBA_BUNDLE7.tar?dl=0Once you click on the link,...

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ORA-00479: RVWR process terminated with error followed by ORA-479

 Problem:On a 19c DB, when trying to enable the FLASHBACK mode on a standby DB, I get the following error: Checking the Alertlog:ORA-00479: RVWR process terminated with error ORA-479 signalled during:...

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Add Disks with Different Sizes to ASM Diskgroup ONLINE

Scenario:As of a sudden, I came to know that an AWS EC2 instance has a limitation of maximum of 27 EBS volumes to be attached to it. One of my EC2 DB server was already having 26 volumes attached to...

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RAC DB Crash by ORA-00600: internal error code, arguments:...

Problem:When implementing a change required a RAC nodes restart one by one on a 19.5 RAC 2 nodes DB, and while restarting one node in the cluster (node2), the other node (node1) started to report this...

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DBA BUNDLE 7.4 Release is Now Available For Download

 The DBA Bundle release of Feb 2023 is now available, use this download link:https://www.dropbox.com/s/le5pxctq0w6v49u/DBA_BUNDLE7.tar?dl=0Once you click on the link, first close this Window:Then,...

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Copy Archivelogs From Standby DR to Primary

You may think the title of this article is wrong; what is the scenario that requires copying archivelogs from Standby to Primary?I ran into a situation on a primary RAC DB data guarded by a standby RAC...

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How To Check if Oracle Gateway for MSSQL is Installed

How To Check if Oracle Gateway for MSSQL is Installed:If the following command returns a list of files, then Oracle Gateway for MSSQL is installed:# ls -l $ORACLE_HOME/dg4msqlIf Oracle Gateway for...

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UNDO Tablespace disappear from dba_tablespace_usage_metrics

 Problem: I had a problem on 19c DBs where I cannot monitor the size of UNDO tablespace because it's now shown in dba_tablespace_usage_metrics view. SQL> select * from dba_tablespace_usage_metrics;...

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Duplicate Target database for standby from active database failing with...

Problem:Duplicate Target database for standby from active database failing with ORA-27101RMAN-00571: ===========================================================RMAN-00569: =============== ERROR MESSAGE...

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too many TNS-01182 errors reported after creating a Standby DB

 Problem:The following error started to come frequently in the listener's log after the creation of a standby DB for the same DB: TNS-01182: Listener rejected registration of service "" Analysis:I've...

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Changing memlock Inside limits.conf is Not Taking Effect

 Problem:I'm trying to change memlock parameter inside /etc/security/limits.conf from default 134217728 to 220200960, but it's not taking effect:The parameter setting inside limits.conf was changed to...

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