12. Performance Tuning

Diagnose and tune performance in this order: data model, ingestion path, query execution plan, memory, and storage. Identify the bottleneck and reproduction conditions before changing settings, then measure before and after with the same workload.

Recommended diagnostic order

Record latency, throughput, and error rates for the target queries and ingestion operations.
Check that the table type matches the data characteristics.
Inspect execution state with EXPLAIN, V$STMT, and V$SESSION.
Adjust indexes, batch sizes, caches, and storage settings one at a time.
Remeasure the effect with the same data and workload.

Chapter contents

Order	Section	Content
12.1	Performance Diagnosis	Baselines, bottleneck classification, execution plans, and system views
12.2	Data Modeling for Performance	Table type and schema design checks
12.3	Index Tuning	Index selection by table type and write costs
12.5	Query and Analysis Tuning	Time predicates, execution plans, ROLLUP, and window functions
12.6	Cache and Memory Tuning	PVO Cache, Min-Max Cache, and memory usage
12.7	Storage and Cluster Tuning	Disk I/O, checkpoints, and Cluster configuration

Throughput and response time depend on hardware, data distribution, schemas, indexes, and concurrent users. Use sample settings as starting points and validate them with production workloads.

Last updated on Sep 9, 2026