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pg_dropcache is a PostgreSQL extension that invalidatesshared_buffers cache

To installpg_dropcache clone this repository and run:

make install USE_PGXS=1

Then in psql (or any other client) execute:

create extension pg_dropcache;

WARNING: Dirty pages will be just dropped, therefore they won't be flushed on the disk! It should be used with extreme caution!

To clear whole buffer cache run:

select pg_dropcache();

To clear cache buffers for just a single relation:

select pg_drop_rel_cache(<relation>);

If you need to clear a specific buffer cache, you can specify it as second parameter:

select pg_drop_rel_cache(<relation>, <fork>);

fork can have one of the following values:

• 'main'
• 'vm'
• 'fsm'
• 'init'

Have fun!