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SERIALIZABLE transactions are actually implemented beneath the covers with

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transaction snapshots, i.e. a snapshot registered at the beginning of
a transaction. Change variable naming and comments to reflect this reality
in preparation for a future, truly serializable mode, e.g.
Serializable Snapshot Isolation (SSI).

For the moment transaction snapshots are still used to implement
SERIALIZABLE, but hopefully not for too much longer. Patch by Kevin
Grittner and Dan Ports with review and some minor wording changes by me.
This commit is contained in:
Joe Conway
2010-09-11 18:38:58 +00:00
parent 262c71ab63
commit 5eb15c9942
11 changed files with 49 additions and 49 deletions
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4
src/backend/executor/execMain.c
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@ -26,7 +26,7 @@
*
*
* IDENTIFICATION
* $PostgreSQL: pgsql/src/backend/executor/execMain.c,v 1.354 2010/08/05 14:45:02 rhaas Exp $
* $PostgreSQL: pgsql/src/backend/executor/execMain.c,v 1.355 2010/09/11 18:38:56 joe Exp $
*
*-------------------------------------------------------------------------
*/
@ -1554,7 +1554,7 @@ EvalPlanQualFetch(EState *estate, Relation relation, int lockmode,
case HeapTupleUpdated:
ReleaseBuffer(buffer);
if (IsXactIsoLevelSerializable)
if (IsolationUsesXactSnapshot())
ereport(ERROR,
(errcode(ERRCODE_T_R_SERIALIZATION_FAILURE),
errmsg("could not serialize access due to concurrent update")));