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Debugging Oracle Performance
A blog by Dinesh Bandelkar
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Tag: Performance

db file sequential read

December 12, 2024 Dinesh Bandelkar 1 Comment

Problem Statement Support team reported a performance issue affecting one of the critical application. According to their update, end users…

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Posted in: Oracle 19c Filed under: Performance

Disk file operations I/O

July 17, 2024 Dinesh Bandelkar 5 Comments

Problem Statement The Application team reported performance slowness and observed intermittent transaction declines. They confirmed that the slowness was due…

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Posted in: Oracle 19c Filed under: Performance

Database Resident Connection Pooling (DRCP)

November 21, 2023 Dinesh Bandelkar 1 Comment

Problem Statement The Core Banking Database has undergone a 19c upgrade. Following the upgrade, the application has experienced severe intermittent…

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Posted in: Oracle 19c Filed under: Performance

ORA-00018: maximum number of sessions exceeded

November 2, 2023 Dinesh Bandelkar 3 Comments

Problem Statement The application team has reported a recurring transaction timeout occurring every Thursday at 9:00 PM. This issue persists for…

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Posted in: RMAN Filed under: Performance

“latch: shared pool”, “library cache: mutex X” & “library cache load lock”

October 21, 2023 Dinesh Bandelkar 3 Comments

Problem Statement The database upgraded to Oracle version 19c. However, on a regular working day evening, the application team noticed…

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Posted in: Database Memory Filed under: Performance

“ORA-23422”: Oracle Server could not generate an unused job number

October 15, 2023 Dinesh Bandelkar 8 Comments

Problem Statement The application team has informed us that they encountered difficulties initiating a transactional SMSALERT job. In initial examination,…

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Posted in: Troubleshooting Filed under: Performance

latch free waits on “FOB s.o list latch”

July 26, 2022 Dinesh Bandelkar 8 Comments

Problem Statement Database had been migrated to new setup. Post migration, as business load increased “latch free” events started surfacing…

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Posted in: Database Memory Filed under: Performance

CARDS Application EOD stuck with “library cache pin”

July 19, 2022 Dinesh Bandelkar 12 Comments

Problem Statement Application team informed us about the regular EOD jobs not progressing as expected. Diagnosis Application team was executing…

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Posted in: Database Memory Filed under: Performance

PeopleSoft “Integration Broker” Performance Issue after Dataguard Remote “FAR SYNC” implementation

May 29, 2018 Dinesh Bandelkar 1 Comment

Problem Statement Production database was hosted on a 6 Node RAC setup and used for PeopleSoft application. Dataguard configured with LOCAL…

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Posted in: DataGuard Filed under: Performance

ORA-04031: unable to allocate 352 bytes of shared memory (“shared pool”,”unknown object”,”sga heap(1,0)”,”krsdicle”)

May 24, 2018 Dinesh Bandelkar 3 Comments

Problem statement Database is recently upgraded to 12.1.0.2 version. After few days, database started terminating with ORA-04031 error consistently. Excerpts…

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Posted in: Database Memory Filed under: Performance

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