PostgreSQL的vacuum过程中lazy_vacuum_heap函数有什么作用

PostgreSQLvacuumlazy_vacuum_heapPostgreSQLvacuumlazy_vacuum_heapPostgreSQLvacuumlazy_vacuum_heapPostgreSQLvacuum,ExecVacuum->vacuum->vacuum_rel->heap_vacuum_rel->lazy_scan_heap->lazy_vacuum_heap,,
Va免费云主机域名cuumAnalyzeitemIdSort
PageRepairFragmentation/PageIndexMultiDeleteLVRelStatsItemPointer
lazy_vacuum_heap
lazy_vacuum_heap,,lazy_scan_heap.
:
1.
2.vacrelstats->num_dead_tuples(ItemPointer)
2.1/
2.2,,
2.3lazy_vacuum_page,
2.4page,page
2.5,
3.lazy_vacuum_page
lazy_vacuum_pagepage,
:
1.
2.
2.1,,
2.2/
2.3,
3.PageRepairFragmentation
3.1(!!!)
3.2,
3.3
3.3.1lp
3.3.2ItemId,itemidbase;ItemId
3.4
A.0,page
B.compactify_tuples
3.5PageAddItem
4.bufferdirty
5.WAL Record
6.all-visible,all-visible
7.pageall-visible,vm
8.page : ,vacuumlazy_vacuum_heap
gdb,
1-relation2-vacrelstats
,pages124,pages124,tuple9501,tuples9401,tuples100,tuplesItemPointerdead_tuples(num_dead_tuples)1.2.vacrelstats->num_dead_tuples(ItemPointer)2.1/2.2,,2.3lazy_vacuum_page,2.4page,page2.5,lazy_vacuum_page
lazy_vacuum_page://tuplevacrelstats(+,)1.2.
2.1,,
2.2/
2.3,3.PageRepairFragmentation
3.1(!!!)3.2,3.3
3.3.1lp
3.3.2ItemId,itemidbase;ItemId,3.4
A.0,page
B.compactify_tuples3.5PageAddItem4.bufferdirty5.WAL Record6.all-visible,all-visible7.pageall-visible,vm8.pagePostgreSQLvacuumlazy_vacuum_heap

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