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Rename "pg_clog" directory to "pg_xact".

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Names containing the letters "log" sometimes confuse users into
believing that only non-critical data is present.  It is hoped
this renaming will discourage ill-considered removals of transaction
status data.

Michael Paquier

Discussion: http://postgr.es/m/CA+Tgmoa9xFQyjRZupbdEFuwUerFTvC6HjZq1ud6GYragGDFFgA@mail.gmail.com
This commit is contained in:
Robert Haas
2017-03-17 09:46:58 -04:00
parent bd9028b824
commit 88e66d193f
28 changed files with 84 additions and 73 deletions
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2
src/backend/storage/buffer/README
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@@ -63,7 +63,7 @@ at about the same time would OR the same bits into the field, so there
is little or no risk of conflicting update; what's more, if there did
manage to be a conflict it would merely mean that one bit-update would
be lost and need to be done again later. These four bits are only hints
(they cache the results of transaction status lookups in pg_clog), so no
(they cache the results of transaction status lookups in pg_xact), so no
great harm is done if they get reset to zero by conflicting updates.
Note, however, that a tuple is frozen by setting both HEAP_XMIN_INVALID
and HEAP_XMIN_COMMITTED; this is a critical update and accordingly requires

4
src/backend/storage/ipc/procarray.c
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@@ -381,7 +381,7 @@ ProcArrayRemove(PGPROC *proc, TransactionId latestXid)
* ProcArrayEndTransaction -- mark a transaction as no longer running
*
* This is used interchangeably for commit and abort cases. The transaction
* commit/abort must already be reported to WAL and pg_clog.
* commit/abort must already be reported to WAL and pg_xact.
*
* proc is currently always MyProc, but we pass it explicitly for flexibility.
* latestXid is the latest Xid among the transaction's main XID and
@@ -1174,7 +1174,7 @@ TransactionIdIsInProgress(TransactionId xid)
* At this point, we know it's either a subtransaction of one of the Xids
* in xids[], or it's not running. If it's an already-failed
* subtransaction, we want to say "not running" even though its parent may
* still be running. So first, check pg_clog to see if it's been aborted.
* still be running. So first, check pg_xact to see if it's been aborted.
*/
xc_slow_answer_inc();