Help Center/ GaussDB/ Distributed_8.x/ Partitioned Table/ Partitioned Table Query Optimization/ Collecting Statistics on Partitioned Tables

Updated on 2024-06-07 GMT+08:00

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Collecting Statistics on Partitioned Tables

For partitioned tables, you can collect partition-level statistics, which can be queried in the pg_partition and pg_statistic system catalogs and in the pg_stats and pg_ext_stats views. Partition-level statistics apply to the scenario where the scanning range of a partitioned table is pruned to a single partition after static pruning is performed on the partitioned table. Partition-level statistics include the number of pages and tuples, single-column statistics, multi-column statistics, and expression index statistics.

You can collect statistics on partitioned tables in either of the following ways:

Collect statistics in cascading mode.
Collecting statistics on a specified partition

Parent topic: Partitioned Table Query Optimization

Previous topic: Partitioned Indexes

Next topic: Collecting Statistics in Cascading Mode

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