database/postgres
1
0
Fork 0
mirror of https://github.com/postgres/postgres.git synced 2025-11-04 20:11:56 +03:00
Code Activity

Arrange for large sequential scans to synchronize with each other, so that

Browse Source 
when multiple backends are scanning the same relation concurrently, each page
is (ideally) read only once.

Jeff Davis, with review by Heikki and Tom.
This commit is contained in:
Tom Lane
2007-06-08 18:23:53 +00:00
parent 6d6d14b6d5
commit a04a423599
10 changed files with 485 additions and 31 deletions
Download Patch File Download Diff File Expand all files Collapse all files

5
src/backend/storage/ipc/ipci.c
View File

@@ -8,13 +8,14 @@
*
*
* IDENTIFICATION
* $PostgreSQL: pgsql/src/backend/storage/ipc/ipci.c,v 1.91 2007/02/15 23:23:23 alvherre Exp $
* $PostgreSQL: pgsql/src/backend/storage/ipc/ipci.c,v 1.92 2007/06/08 18:23:52 tgl Exp $
*
*-------------------------------------------------------------------------
*/
#include "postgres.h"
#include "access/clog.h"
#include "access/heapam.h"
#include "access/multixact.h"
#include "access/nbtree.h"
#include "access/subtrans.h"
@@ -112,6 +113,7 @@ CreateSharedMemoryAndSemaphores(bool makePrivate, int port)
size = add_size(size, BgWriterShmemSize());
size = add_size(size, AutoVacuumShmemSize());
size = add_size(size, BTreeShmemSize());
size = add_size(size, SyncScanShmemSize());
#ifdef EXEC_BACKEND
size = add_size(size, ShmemBackendArraySize());
#endif
@@ -216,6 +218,7 @@ CreateSharedMemoryAndSemaphores(bool makePrivate, int port)
* Set up other modules that need some shared memory space
*/
BTreeShmemInit();
SyncScanShmemInit();
#ifdef EXEC_BACKEND