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[PERFORM] Pageinspect bt_metap help - Mailing list pgsql-performance
From
Neto pr
Subject
[PERFORM] Pageinspect bt_metap help
Date
September 18, 2017
03:52:37
Msg-id
CA+wPC0MRuc0qn6v57VNtBE0Dh-r1Bcugi4FHHqC_kY-1X2tzGQ@mail.gmail.com
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Re: [PERFORM] Pageinspect bt_metap help
(Peter Geoghegan <pg@bowt.ie>)
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pgsql-performance
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Hello All
I am using Postgresql extension pageinspect.
Could someone tell me the meaning of these columns: magic, version, root, level, fastroot, fastlevel of the bt_metap function.
This information is not presents in the documentation.
The height of the b-tree (position of node farthest from root to leaf), is the column Level?
See below a return query that I ran on an index called idx_l_shipmodelineitem000
------------------------------------------------------------------
postgres # SELECT * FROM bt_metap ('idx_l_shipmodelineitem000');
postgres # magic
| version
| root | level | fastroot | fastlevel
postgres # 340322
| 2
| 41827 | 3 | 41827 | 3
Best regards
Neto
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