Hi,

Buffer pool is updated too. LRU algorithm evicts the pages from buffer pool and purge thread will clean up the actual rows.

Hi all,

When adding or dropping a primary and/or secondary index is the InnoDB buffer pool updated too? Is the pool changed in place or will the LRU algo just evict to make room? In the second case buffers of other tables on the server might be affected too and the server would run with a more or less cold buffer pool.

We have to fiddle with indices on production servers, which by itself is a precarious matter. So I tried to find out how ADD/DROP INDEX operations affect the memory/buffer pool of our servers. Since I wasn't able (or too stupid) to find something about this topic it would be great if someone could help me out and point me in the right direction.

BTW: Version is MariaDB 5.5

Cheers,

Shorty

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R: Jan