Robert Haas wrote:

> Eh ... I doubt very much that it's safe to blow away the entire
> contents of an SLRU between shutdown and startup, even if the data is
> technically transient data that won't be needed again after the system
> is reset.

Hmm.  At least async.c (pg_notify) deletes the whole directory at
startup so it's fine, but for the others (pg_serial, pg_subtrans) I
think it'd be saner to keep any "active" files (probably just the
latest).  I don't remember how pg_snapshot works, but it's probably fine
to start with an empty subdir (is it possible to export a snapshot from
a prepared transaction?)

Álvaro Herrera      
PostgreSQL Development, 24x7 Support, Remote DBA, Training & Services

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