database/postgres
1
0
Fork 0
mirror of https://github.com/postgres/postgres.git synced 2025-06-14 18:42:34 +03:00
Code Activity

Combine cmin and cmax fields of HeapTupleHeaders into a single field, by

Browse Source 
keeping private state in each backend that has inserted and deleted the same
tuple during its current top-level transaction.  This is sufficient since
there is no need to be able to determine the cmin/cmax from any other
transaction.  This gets us back down to 23-byte headers, removing a penalty
paid in 8.0 to support subtransactions.  Patch by Heikki Linnakangas, with
minor revisions by moi, following a design hashed out awhile back on the
pghackers list.
This commit is contained in:
Tom Lane
2007-02-09 03:35:35 +00:00
parent acb3416686
commit c398300330
21 changed files with 799 additions and 127 deletions
Download Patch File Download Diff File Expand all files Collapse all files

8
src/pl/plpython/plpython.c
View File

@ -1,7 +1,7 @@
/**********************************************************************
* plpython.c - python as a procedural language for PostgreSQL
*
* $PostgreSQL: pgsql/src/pl/plpython/plpython.c,v 1.94 2007/02/01 19:10:30 momjian Exp $
* $PostgreSQL: pgsql/src/pl/plpython/plpython.c,v 1.95 2007/02/09 03:35:35 tgl Exp $
*
*********************************************************************
*/
@ -123,7 +123,7 @@ typedef struct PLyProcedure
char *proname; /* SQL name of procedure */
char *pyname; /* Python name of procedure */
TransactionId fn_xmin;
CommandId fn_cmin;
ItemPointerData fn_tid;
bool fn_readonly;
PLyTypeInfo result; /* also used to store info for trigger tuple
* type */
@ -1100,7 +1100,7 @@ PLy_procedure_get(FunctionCallInfo fcinfo, Oid tgreloid)
elog(FATAL, "proc->me != plproc");
/* did we find an up-to-date cache entry? */
if (proc->fn_xmin != HeapTupleHeaderGetXmin(procTup->t_data) ||
proc->fn_cmin != HeapTupleHeaderGetCmin(procTup->t_data))
!ItemPointerEquals(&proc->fn_tid, &procTup->t_self))
{
Py_DECREF(plproc);
proc = NULL;
@ -1151,7 +1151,7 @@ PLy_procedure_create(FunctionCallInfo fcinfo, Oid tgreloid,
proc->proname = PLy_strdup(NameStr(procStruct->proname));
proc->pyname = PLy_strdup(procName);
proc->fn_xmin = HeapTupleHeaderGetXmin(procTup->t_data);
proc->fn_cmin = HeapTupleHeaderGetCmin(procTup->t_data);
proc->fn_tid = procTup->t_self;
/* Remember if function is STABLE/IMMUTABLE */
proc->fn_readonly =
(procStruct->provolatile != PROVOLATILE_VOLATILE);