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Fix pgstattuple to acquire a read lock on the target table. This

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prevents embarassments such as having the table dropped or truncated
partway through the scan.  Also, fix free space calculation to include
pages that currently contain no tuples.
This commit is contained in:
Tom Lane
2001-12-19 20:28:41 +00:00
parent 9aa2e7da51
commit 897083715b
2 changed files with 38 additions and 20 deletions
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4
contrib/pgstattuple/README.pgstattuple
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@ -15,7 +15,7 @@ NOTICE: physical length: 0.08MB live tuples: 20 (0.00MB, 1.17%) dead tuples: 32
18.75
(1 row)
Above example shows tellers tables includes 18.75% dead tuples.
Above example shows tellers table includes 18.75% dead tuples.
physical length physical size of the table in MB
live tuples information on the live tuples
@ -40,7 +40,7 @@ NOTICE: physical length: 0.08MB live tuples: 20 (0.00MB, 1.17%) dead tuples: 32
4. Notes
pgstattuple does not lock the target table at all. So concurrent
pgstattuple acquires only a read lock on the table. So concurrent
update may affect the result.
pgstattuple judges a tuple is "dead" if HeapTupleSatisfiesNow()