Tag: planner

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Optimization issues: Cross column correlation

by Hans-Jürgen Schönig | 07.2014
UPDATE Sept. 2023: For more recent information about planner statistics, see the PostgreSQL documentation about extended statistics, or this blog […]

Detecting wrong planner estimates

by Hans-Jürgen Schönig | 07.2014
In 99% of all cases the PostgreSQL planner does a perfect job to optimize your queries and to make sure […]

The power of response times and execution time

by Hans-Jürgen Schönig | 04.2014
The goal of the PostgreSQL optimizer is to provide you with a plan, which executes as fast as possible and […]

effective_cache_size: Better set it right

by Hans-Jürgen Schönig | 11.2013
PostgreSQL knows a parameter called effective_cache_size. To many this is one of the most mysterious settings in the entire PostgreSQL […]
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