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a04a4235

Commit a04a4235 authored 17 years ago by Tom Lane

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

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

Jeff Davis, with review by Heikki and Tom.

parent 6d6d14b6

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Changes 10

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src/backend/access/heap/Makefile 2 additions, 2 deletions

src/backend/access/heap/Makefile
src/backend/access/heap/heapam.c 112 additions, 14 deletions

src/backend/access/heap/heapam.c
src/backend/access/heap/syncscan.c 318 additions, 0 deletions

src/backend/access/heap/syncscan.c
src/backend/storage/buffer/freelist.c 4 additions, 1 deletion

src/backend/storage/buffer/freelist.c
src/backend/storage/ipc/ipci.c 4 additions, 1 deletion

src/backend/storage/ipc/ipci.c
src/backend/utils/misc/guc.c 17 additions, 1 deletion

src/backend/utils/misc/guc.c
src/include/access/heapam.h 15 additions, 9 deletions

src/include/access/heapam.h
src/include/access/relscan.h 5 additions, 1 deletion

src/include/access/relscan.h
src/include/pg_config_manual.h 6 additions, 1 deletion

src/include/pg_config_manual.h
src/include/storage/lwlock.h 2 additions, 1 deletion

src/include/storage/lwlock.h

with 485 additions and 31 deletions

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