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Magnus Hagander bc5ac36865 Add function pg_xlog_location_diff to help comparisons
Comparing two xlog locations are useful for example when calculating
replication lag.

Euler Taveira de Oliveira, reviewed by Fujii Masao, and some cleanups
from me
2012-03-04 12:22:38 +01:00
..
2011-03-28 22:56:52 +03:00