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Memo bloat
Message
From
05/10/2005 08:12:54
 
 
To
05/10/2005 07:31:19
General information
Forum:
Visual FoxPro
Category:
Databases,Tables, Views, Indexing and SQL syntax
Title:
Environment versions
Visual FoxPro:
VFP 6 SP5
OS:
Windows XP
Network:
Windows 2000 Server
Database:
Visual FoxPro
Miscellaneous
Thread ID:
01056130
Message ID:
01056200
Views:
21
>SNIP
>>>When a new memo is added or an existing is changed the blocks are allocated in 64 byte chuncks, so on average there is a waste of 32 bytes/memo
>>>Changing a memo does not happen 'in place', the whole memo is rewritten, the old apace is not re-used, hence the bloat
>>
>>This is not true, if LEN(memo) it doesn't overcome CEILING(LEN(memo)/BLOCKSIZE)*BLOCKSIZE
>>blocksize it rewritten the memo in place.
>>
>SNIP
>
>Fabio,
>
>Please check out Re: .FPT files - bloat and re-writing of file header Thread #971406 Message #972068
>
>It says, as I read it, that memo field is always re-written.
>
>cheers

hi Jim,

Funny. I had done a few tests after Fabio's reply and my tests indicated Fabio was right (he usually is). I created a free table and did 100,000 replaces.
But then, I had the table exclusively and not buffered

Thanks for digging this one up. I must have read that message before. Just could not remember it
Gregory
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