Vacuum info clarification

From: Bruce Momjian <pgman(at)candle(dot)pha(dot)pa(dot)us>
To: PostgreSQL-development <pgsql-hackers(at)postgreSQL(dot)org>
Subject: Vacuum info clarification
Date: 2004-11-11 05:03:25
Message-ID: 200411110503.iAB53PP12891@candle.pha.pa.us
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The last two lines of VACUUM VERBOSE are:

INFO: free space map: 49 relations, 32 pages stored; 784 total pages needed
DETAIL: Allocated FSM size: 1000 relations + 20000 pages = 182 kB shared memory.

I think "total pages needed" should be "total pages used" or "total
pages requested".

I am confused about the difference between "stored" and "requested". I
read the comments in freespace.c but am still confused.

--
Bruce Momjian | http://candle.pha.pa.us
pgman(at)candle(dot)pha(dot)pa(dot)us | (610) 359-1001
+ If your life is a hard drive, | 13 Roberts Road
+ Christ can be your backup. | Newtown Square, Pennsylvania 19073

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