Thread: pgsql: Derive oldestActiveXid at correct time for Hot Standby.

Derive oldestActiveXid at correct time for Hot Standby.
There was a timing window between when oldestActiveXid was derived
and when it should have been derived that only shows itself under
heavy load. Move code around to ensure correct timing of derivation.
No change to StartupSUBTRANS() code, which is where this failed.

Bug report by Chris Redekop

Branch
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REL9_0_STABLE

Details
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http://git.postgresql.org/pg/commitdiff/656bba95af3950b26e9e97d86d29787d89e2b423

Modified Files
--------------
src/backend/access/transam/xlog.c   |   14 +++++++--
src/backend/storage/ipc/procarray.c |   57 +++++++++++++++++++++++++++++++++++
src/backend/storage/ipc/standby.c   |    3 +-
src/include/storage/procarray.h     |    1 +
src/include/storage/standby.h       |    2 +-
5 files changed, 71 insertions(+), 6 deletions(-)