Grant Maxwell <grant(dot)maxwell(at)maxan(dot)com(dot)au> writes:
> On the problem server:
> shared_preload_libraries = 'pgmemcache'
> #local_preload_libraries = ''
> on the others both are emply.
Sounds like a smoking gun to me.
> For good measure I removed pgmemcache but the problem persists.
Did you restart the postmaster afterwards? shared_preload_libraries
is only considered at postmaster start.
regards, tom lane