| From: | Mark Kirkwood <markir(at)paradise(dot)net(dot)nz> |
|---|---|
| To: | Tatsuo Ishii <ishii(at)sraoss(dot)co(dot)jp> |
| Cc: | alvherre(at)commandprompt(dot)com, peter_e(at)gmx(dot)net, pgsql-hackers(at)postgresql(dot)org, Tom Lane <tgl(at)sss(dot)pgh(dot)pa(dot)us> |
| Subject: | Re: pg_freespacemap question |
| Date: | 2006-03-08 04:47:50 |
| Message-ID: | 440E61F6.6020205@paradise.net.nz |
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| Thread: | |
| Lists: | pgsql-hackers pgsql-patches |
Mark Kirkwood wrote:
> Tatsuo Ishii wrote:
>
>> BTW, I found the answer to my question myself by reading the source
>> code: if that's an index, then blockfreebytes is explicitly set to 0.
>> I suggest that this should be noted in the README and in this case
>> blockfreebytes is better to set to NULL, rather than 0.
>>
>
> Good points! I had not noticed this test case. Probably NULL is better
> than zero.
>
Would setting it to 'BLCKSZ - (fixed index header stuff)' be better,
since the btree page is empty? (I'll have to read up on how to calculate
the header stuff!).
regards
Mark
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