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Update comments in RecordTransactionCommit() to mention unlogged tables.

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This commit is contained in:
Robert Haas 2011-01-03 10:29:22 -05:00
parent 77745cc7f1
commit dc8a14311a
1 changed files with 9 additions and 8 deletions
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17
src/backend/access/transam/xact.c
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@ -1033,14 +1033,15 @@ RecordTransactionCommit(void)
* Check if we want to commit asynchronously. We can allow the XLOG flush
* to happen asynchronously if synchronous_commit=off, or if the current
* transaction has not performed any WAL-logged operation. The latter case
* can arise if the current transaction wrote only to temporary tables.
* In case of a crash, the loss of such a transaction will be irrelevant
* since temp tables will be lost anyway. (Given the foregoing, you might
* think that it would be unnecessary to emit the XLOG record at all in
* this case, but we don't currently try to do that. It would certainly
* cause problems at least in Hot Standby mode, where the KnownAssignedXids
* machinery requires tracking every XID assignment. It might be OK to
* skip it only when wal_level < hot_standby, but for now we don't.)
* can arise if the current transaction wrote only to temporary and/or
* unlogged tables. In case of a crash, the loss of such a transaction
* will be irrelevant since temp tables will be lost anyway, and unlogged
* tables will be truncated. (Given the foregoing, you might think that it
* would be unnecessary to emit the XLOG record at all in this case, but we
* don't currently try to do that. It would certainly cause problems at
* least in Hot Standby mode, where the KnownAssignedXids machinery
* requires tracking every XID assignment. It might be OK to skip it only
* when wal_level < hot_standby, but for now we don't.)
*
* However, if we're doing cleanup of any non-temp rels or committing any
* command that wanted to force sync commit, then we must flush XLOG