Well I have a port to latest version (3.6.23.1) of sqlite to palmos, and in some devices with this S.O. had only 2MB of Dynamic Heap. On this environments sqlite doesn't works pretty well, then to work I had to set the cache size (PRAGMA cache_size) for all attached database, calculating the possible value based on the amouth of free memory and the page size.
Hanging this on mind, on vacuum I had to do the same thing, but on vacuum the sqlite make attach of a memory database and that need use the same size of cache used by main database, then, I modified the sqlite code to do this, and now vacuum will work. I'm sending attached the path for this. -- Atenciosamente/Regards, Israel Lins Albuquerque Desenvolvimento/Development Polibrás Brasil Software Ltda.
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