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Performance Tuning Areas

Just picking those area that require tuning! Source – OraFAQ

  •     Database Design (if it’s not too late):

Poor system performance usually results from a poor database design. One should generally normalize to the 3NF. Selective denormalization can provide valuable performance improvements. When designing, always keep the “data access path” in mind. Also look at proper data partitioning, data replication, aggregation tables for decision support systems, etc.

  •     Application Tuning:

Experience shows that approximately 80% of all Oracle system performance problems are resolved by coding optimal SQL. Also consider proper scheduling of batch tasks after peak working hours.

  •     Memory Tuning:

Properly size your database buffers (shared_pool, buffer cache, log buffer, etc) by looking at your wait events, buffer hit ratios, system swapping and paging, etc. You may also want to pin large objects into memory to prevent frequent reloads.

  •     Disk I/O Tuning:

Database files needs to be properly sized and placed to provide maximum disk subsystem throughput. Also look for frequent disk sorts, full table scans, missing indexes, row chaining, data fragmentation, etc.

  •     Eliminate Database Contention:

Study database locks, latches and wait events carefully and eliminate where possible.

  •     Tune the Operating System:

Monitor and tune operating system CPU, I/O and memory utilization. For more information, read the related Oracle FAQ dealing with your specific operating system.

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