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Re: FSM search modes

From: Tom Lane <tgl(at)sss(dot)pgh(dot)pa(dot)us>
To: Simon Riggs <simon(at)2ndQuadrant(dot)com>
Cc: Alvaro Herrera <alvherre(at)commandprompt(dot)com>, decibel <decibel(at)decibel(dot)org>, Kevin Grittner <Kevin(dot)Grittner(at)wicourts(dot)gov>, Itagaki Takahiro <itagaki(dot)takahiro(at)oss(dot)ntt(dot)co(dot)jp>, pgsql-hackers <pgsql-hackers(at)postgresql(dot)org>
Subject: Re: FSM search modes
Date: 2009-10-01 16:31:43
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Lists: pgsql-hackers
Simon Riggs <simon(at)2ndQuadrant(dot)com> writes:
> No real need to be random is there? In the bloated space scenario,
> VACUUM will be triggered but will be unable to remove the empty blocks.
> So in that case VACUUM can hint the FSM to perform "start from beginning
> of relation" behaviour.

No, that's an entirely unrelated issue.  My point is that there won't
*be* any empty end blocks unless we discourage FSM from handing out
those pages as insertion targets.

			regards, tom lane

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