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Add pgstattuple_approx() to the pgstattuple extension.

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The new function allows to estimate bloat and other table level statics
in a faster, but approximate, way. It does so by using information from
the free space map for pages marked as all visible in the visibility
map. The rest of the table is actually read and free space/bloat is
measured accurately.  In many cases that allows to get bloat information
much quicker, causing less IO.

Author: Abhijit Menon-Sen
Reviewed-By: Andres Freund, Amit Kapila and Tomas Vondra
Discussion: 20140402214144.GA28681@kea.toroid.org
This commit is contained in:
Andres Freund
2015-05-13 07:31:04 +02:00
parent dcf5e31908
commit 5850b20f58
6 changed files with 446 additions and 5 deletions
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contrib/pgstattuple/pgstattuple.control
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@ -1,5 +1,5 @@
# pgstattuple extension
comment = 'show tuple-level statistics'
default_version = '1.2'
default_version = '1.3'
module_pathname = '$libdir/pgstattuple'
relocatable = true