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Yyds dry goods inventory accelerating vacuum in PG

2022-07-02 02:30:00 【YZS column】

Speed up PG in vacuum

once VACUUM After process initiation ,VACUUM Can a big watch speed up ？

In short , once vacuum start-up , It is impossible to affect its speed . The main reason is , Most of the resources of this process are used for disk operation , These operations are not too fast . Besides , Still leave enough resources for regular database processes . Consider this , Changing some system parameters can allow separate VACUUM The working process accelerates its performance .

So , The configuration is quite “ radical ” Configuration of . such VACUUM Processes can be initiated more frequently , But with every start , These processes require less operation , Thus reducing the overall working time .

Here is AUTOVACUUM Parameter configuration ：

1） Configure the right autovacumm_max_workers（ The default value is 3, This value is low , therefore 10 Right or left ）

2） increase AUTOVACUUM Check the frequency of initiation （autovacuum_naptime=1s, The default value is 1 minute ）

3） Reduce auto trigger AUTOVACUUM Threshold of initiation .（autovacuum_vacuum_threshold=50

,autovacuum_analyze_threshold=10,autovacuum_vacuum_scale_factor=0.05,

autovacuum_analyze_scale_factor=0.05）

4） Lower trigger FREEZE The threshold of （autovacuum_freeze_min_age=5000000, vacuum_freeze_table_age=15000000）

autovacuum_max_workers It takes effect after the service is restarted , Other parameters are not required . Using the above parameters will increase AUTOVACUUM Frequency of accessing the table , At the same time, the work is broken down into smaller parts . thus VACUUM Will need to reduce the workload share , And in turn speed up the execution of the overall order .

in addition , One is more “ radical ” The parameter value of can be used for VACUUM command （vacuum_cost_delay=0, vacuum_cost_page_hit=0, vacuum_cost_page_miss=1, vacuum_cost_page_dirty=10, vacuum_cost_limit=100）. This allows VACUUM Use more resources , At the expense of other service processes , And reduces the pause limit between service workloads .