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I am using a PIC32, which is a 32-bit processor clocked at 80 MIPS with about 64-128KB of RAM available. It will be accessing a microSD card - up to 4 GB, on a FAT32 filesystem. Running all of this is pushing it, but I need a compact database that can be easily ported to this platform and one which is fast. Does anyone have any suggestions?

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Although I fail to see usefulness for this, I'm very curious about that. – bigown Jan 3 '11 at 22:29
Which OS is it running on? – IamIC Jan 4 '11 at 16:30
@IanC... uh... not really running an OS, just a single program. – Thomas O Jan 4 '11 at 16:54
@IanC, If any OS, it could be something like FreeRTOS. – Thomas O Jan 4 '11 at 16:55
Do you want a relational/SQL DB or something different like a key-value store? – Eelke Jul 23 '12 at 13:41

A ported version of SQL Lite is probably your best bet. See this thread.

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