Which optimizer is used in the opengauss database, the CBO or RBO? Do they make any difference?

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CBO is Cost-Based Optimization, the optimizer generates multiple execution plans by transforming relational expressions according to optimization rules. RBO is Rule-Based Optimization, the optimizer determines the execution plan of SQL following a series of rules hard-coded in the database. So, which optimizer does the openGauss database use, the CBO or RBO? Do they make any difference?

What I have tried:

I tried to google it, but no results?

Posted 28-Jul-22 16:39pm

Member 15710970

Updated 28-Jul-22 18:55pm

PIEBALDconsult

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OriginalGriff · Answer 1 · 2022-07-28T18:55:00

Solution 1

As you have already repeatedly been told, the answer will be found at openGauss | openGauss[^]

Go away, read the documentation, and start thinking about your homework for yourself instead of expecting others to do that for you.

Posted 28-Jul-22 18:55pm

OriginalGriff