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Add pinning_backends column to the pg_buffercache extension.

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The new column shows how many backends have a buffer pinned. That can
be useful during development or to diagnose production issues
e.g. caused by vacuum waiting for cleanup locks.

To handle upgrades transparently - the extension might be used in
views - deal with callers expecting the old number of columns.

Reviewed by Fujii Masao and Rajeev rastogi.
This commit is contained in:
Andres Freund
2014-08-22 00:28:37 +02:00
parent ce486056ec
commit f57791985a
6 changed files with 58 additions and 6 deletions
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2
contrib/pg_buffercache/pg_buffercache.control
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@ -1,5 +1,5 @@
# pg_buffercache extension
comment = 'examine the shared buffer cache'
default_version = '1.0'
default_version = '1.1'
module_pathname = '$libdir/pg_buffercache'
relocatable = true