pgsql: Implement mxid_age() to compute multi-xid age

Implement mxid_age() to compute multi-xid age

Report by Josh Berkus

Branch
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master

Details
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http://git.postgresql.org/pg/commitdiff/36ad1a87a368d837d5c2260b2fd2ff83e976425a

Modified Files
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doc/src/sgml/maintenance.sgml | 7 ++++++-
src/backend/utils/adt/xid.c | 16 ++++++++++++++++
src/include/catalog/catversion.h | 2 +-
src/include/catalog/pg_proc.h | 2 ++
src/include/utils/builtins.h | 1 +
5 files changed, 26 insertions(+), 2 deletions(-)

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