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Use streaming I/O in ANALYZE.

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The ANALYZE command prefetches and reads sample blocks chosen by a
BlockSampler algorithm. Instead of calling [Prefetch|Read]Buffer() for
each block, ANALYZE now uses the streaming API introduced in b5a9b18cd0.

Author: Nazir Bilal Yavuz <byavuz81@gmail.com>
Reviewed-by: Melanie Plageman <melanieplageman@gmail.com>
Reviewed-by: Andres Freund <andres@anarazel.de>
Reviewed-by: Jakub Wartak <jakub.wartak@enterprisedb.com>
Reviewed-by: Heikki Linnakangas <hlinnaka@iki.fi>
Reviewed-by: Thomas Munro <thomas.munro@gmail.com>
Discussion: https://postgr.es/m/flat/CAN55FZ0UhXqk9v3y-zW_fp4-WCp43V8y0A72xPmLkOM%2B6M%2BmJg%40mail.gmail.com
This commit is contained in:
Thomas Munro
2024-04-08 13:16:20 +12:00
parent f587338dec
commit 041b96802e
3 changed files with 43 additions and 76 deletions
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5
src/include/access/heapam.h
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@@ -413,9 +413,8 @@ extern bool HeapTupleIsSurelyDead(HeapTuple htup,
struct GlobalVisState *vistest);
/* in heap/heapam_handler.c*/
extern void heapam_scan_analyze_next_block(TableScanDesc scan,
BlockNumber blockno,
BufferAccessStrategy bstrategy);
extern bool heapam_scan_analyze_next_block(TableScanDesc scan,
ReadStream *stream);
extern bool heapam_scan_analyze_next_tuple(TableScanDesc scan,
TransactionId OldestXmin,
double *liverows, double *deadrows,