Oracle Row Cache Lock Wait Event Explained
The row cache lock wait event is associated with a specific enqueue type on a data dictionary row. Learn why this happens and what you can do to tune for it.
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Solving Oracle enq: TM Contention Wait Events
Waits on enq: TM – contention in Oracle indicate there are unindexed foreign key constraints. Learn more about how foreign key constraints relate to this wait and how to tune for it.
Read MoreORA 06502 Numeric or Value Error
The error ORA-06502 PL/SQL can be addressed by modifying the data, how it’s declared or the operations on it. Learn more.
Read MoreOracle File Open Wait Event
The file open wait event signals problems outside the database, such as performance issues in the database server. Learn how to assess and fix these issues.
Read MoreOracle RO Enqueue Wait Event
When a database isn’t properly configured or application logic stresses normal processing, you may have issues with the RO enqueue wait event. Learn more.
Read MoreOracle Index Block Split Wait Event
Learn how Oracle determines the best index access path for finding rows in a table, and how this may impact performance.
Read MoreOracle Latch Free Wait Event
The latch free wait event occurs when a session tries to get a latch but fails because another session has it. Learn how this wait causes performance issues.
Read MoreOracle Log Buffer Space Wait Event
The log buffer space wait event occurs when server processes write data into the log buffer faster than the LGWR process can write it out. Learn more.
Read MoreSQL Server WRITELOG Wait Type
WRITELOG wait types in SQL Server can indicate bottlenecks in the disk where the transaction log is stored or inefficient use of transactions. Learn how to tune for this wait type.
Read MoreOracle PL/SQL Lock Timer Wait Event
The PL/SQL lock timer wait event can indicate issues with application response, throughput and possibly coding. Learn more.
Read MoreOracle RAC Wait Events: gc cr request, gc buffer busy acquire and gc buffer busy release
The special use of a global buffer cache in Oracle RAC makes it critical to monitor inter-instance communication via the cluster-specific wait events gc cr request and gc buffer busy. Learn more.
Read MoreOracle Read By Other Session Wait Event
Read by Other Session events in Oracle indicate contention for hot blocks or objects. To tune for this, you can redistribute data from hot blocks, adjust PCTFREE and PCTUSED values, reduce the block size or optimize indexes.
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