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Add function pg_xlog_location_diff to help comparisons

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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
This commit is contained in:
Magnus Hagander
2012-03-04 12:15:24 +01:00
parent 0e5e167aae
commit bc5ac36865
5 changed files with 114 additions and 2 deletions
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src/include/access/xlog_internal.h
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@@ -281,5 +281,6 @@ extern Datum pg_is_in_recovery(PG_FUNCTION_ARGS);
extern Datum pg_xlog_replay_pause(PG_FUNCTION_ARGS);
extern Datum pg_xlog_replay_resume(PG_FUNCTION_ARGS);
extern Datum pg_is_xlog_replay_paused(PG_FUNCTION_ARGS);
extern Datum pg_xlog_location_diff(PG_FUNCTION_ARGS);
#endif /* XLOG_INTERNAL_H */