Re: measuring WAL creation

Scott Ribe <scott_ribe(at)elevated-dev(dot)com> writes:
> I'd like to measure both the amount of WAL created by a long series of data modifications and the compressed size of the generated WAL files.
> I suppose I need to set wal_keep_size high, and pay attention to segment numbers to make sure it was high enough. Then I can look at segments created while the commands were running.

> But question: can I simply delete all WAL after a clean shutdown?

As a general rule, never do that manually --- the risk/reward ratio is
unattractive. A checkpoint will release all safely-releasable WAL.
You can checkpoint via a shutdown if you insist, but a plain
CHECKPOINT command should be enough.

regards, tom lane