Best Practices for Getting the Most from Oracle Exadata
Learn best practices for getting the most from Oracle Exadata for your Oracle 11gR2 database instances.
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What Makes Oracle Exadata So Great
Oracle Exadata hardware combines the power of the database with features Oracle added at the hardware level that other hardware providers can’t replicate easily. Learn more.
Read MoreAbout Oracle RAC Global Cache CR Request Wait Event
Learn how to diganose and tune for Oracle RAC global cache cr request or gc cache cr request wait events.
Read MoreAbout Lock Mastering and Resource Affinity in Oracle RAC
Understand how, in Oracle RAC, the Global Resource Directory (GRD) dynamically remasters resources based on resource affinity, which enhances the performance.
Read MoreUnderstanding Oracle Write Complete Waits
If a session spends a lot of time waiting on the Oracle write complete waits event, it is usually due to a slow I/O subsystem, the MTTR is too short or the DBWR write batch size is too large.
Read MoreUnderstanding Oracle Free Buffer Wait Events
Oracle free buffer waits are caused by inefficient SQL statements, not enough DBWR processes, slow I/O subsystems, delayed block cleanouts and/or small buffer caches.
Read MoreUnderstanding Oracle Log Buffer Space Wait Events
The Oracle log buffer space wait event can indicate that the log buffer in the SGA is too small or the LGWR process is too slow.
Read MoreSolving Oracle Log File Sync Waits Caused by High Commit Frequency
High commit frequency is the number one cause for foreground log file sync waits in Oracle. Learn how to diagnose and tune for these waits.
Read MoreDiagnosing Oracle Wait for TM Enqueue in Mode 3
Unindexed foreign key columns are the primary cause of Oracle TM lock contention in mode 3; however, this only applies to databases prior to Oracle9i Database.
Read MoreDiagnosing Oracle Wait for TX Enqueue in Mode 4–Bitmap Index Entry
Diagnose Oracle waits for TX enqueue in mode 4 that are caused by multiple sessions attempting to update or delete different rows covered by the same bitmap entry.
Read MoreDiagnosing Oracle Wait for TX Enqueue in Mode 4–Unique Key Enforcement
Unique or primary key enforcement may cause Oracle enq: TX—row lock contention, indicating an application issue outside the database.
Read MoreDiagnosing Oracle Wait for TX Enqueue in Mode 4–ITL Shortage
Learn how to diagnose Oracle waits for TX enqueue in mode 4 that are caused by ITL (interested transaction list) shortage.
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