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Question on output of VACUUM VERBOSE - Mailing list pgsql-general

From Cornelia Boenigk
Subject Question on output of VACUUM VERBOSE
Date
Msg-id 000a01c4fcea$5f2eb5a0$0201a8c0@zwerg2000
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In response to Re: ext3  (Tzahi Fadida <tzahi_ml@myrealbox.com>)
Responses Re: Question on output of VACUUM VERBOSE
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Hi all

I don't understand what these two lines exactly mean.

INFO:  free space map: 490 relations, 13541 pages stored; 34480 total pages
needed
DETAIL: Allocated FSM size: 1000 relations + 20000 pages = 178 kB shared
memory

Thanks in advance
Conni

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