Alvaro Herrera wrote:
Alvaro Herrera wrote:
New version of the patch attached.

I'll probably apply this tomorrow morning unless there are objections.

An important difference from the previous patch is that
DatabaseHasActiveBackends (now renamed to
DatabaseCancelAutovacuumActivity) cycles through the whole ProcArray
instead of stopping at the first occurence of a backend in that
database.  This is to be able to fulfill its mission of cancelling *any*
autovacuum activity that may be taking place on the database (not just
the one that happens to be below the first process in the ProcArray).

Is there any chance of a race condition here? That is, can the launcher process start a new autovacuum process against that database that your code will miss since it was started after you began your search?

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