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When using the WAL-logged CREATE DATABASE strategy, bulk extend.

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This should improve performance, and was suggested by Andres Freund.
Back-patch to v15 to keep the code consistent across branches.

Dilip Kumar

Discussion: http://postgr.es/m/C3458199-FEDD-4356-865A-08DFAA5D4065@anarazel.de
Discussion: http://postgr.es/m/CAFiTN-sJ0vVpJrZ=R5M+g7Tr8=NN4wKOtrqOcDEsfFfnZgivVA@mail.gmail.com
This commit is contained in:
Robert Haas 2022-08-18 11:09:39 -04:00
parent 27f1774aac
commit 3e63e8462f
1 changed files with 10 additions and 1 deletions
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11
src/backend/storage/buffer/bufmgr.c
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@ -3712,6 +3712,7 @@ RelationCopyStorageUsingBuffer(RelFileLocator srclocator,
bool use_wal;
BlockNumber nblocks;
BlockNumber blkno;
PGAlignedBlock buf;
BufferAccessStrategy bstrategy_src;
BufferAccessStrategy bstrategy_dst;
@ -3730,6 +3731,14 @@ RelationCopyStorageUsingBuffer(RelFileLocator srclocator,
if (nblocks == 0)
return;
/*
* Bulk extend the destination relation of the same size as the source
* relation before starting to copy block by block.
*/
memset(buf.data, 0, BLCKSZ);
smgrextend(smgropen(dstlocator, InvalidBackendId), forkNum, nblocks - 1,
buf.data, true);
/* This is a bulk operation, so use buffer access strategies. */
bstrategy_src = GetAccessStrategy(BAS_BULKREAD);
bstrategy_dst = GetAccessStrategy(BAS_BULKWRITE);
@ -3747,7 +3756,7 @@ RelationCopyStorageUsingBuffer(RelFileLocator srclocator,
srcPage = BufferGetPage(srcBuf);
/* Use P_NEW to extend the destination relation. */
dstBuf = ReadBufferWithoutRelcache(dstlocator, forkNum, P_NEW,
dstBuf = ReadBufferWithoutRelcache(dstlocator, forkNum, blkno,
RBM_NORMAL, bstrategy_dst,
permanent);
LockBuffer(dstBuf, BUFFER_LOCK_EXCLUSIVE);