On Thu, Oct 2, 2008 at 4:20 AM, Paul McMahon <[EMAIL PROTECTED]> wrote: > What's the consensus on using sqlite with flash based storage such as sd > cards on embedded devices? > > Has anyone done this successfully yet with a real product (that needs to > last a few years in the field)? >
We've got several (Linux-based) embedded products using SQLite databases. One has an M-Systems SoC with Ext3 on top of TFFS, another uses CompactFlash with Ext3, and yet another uses a directly-addressed NOR chip with JFFS2. None have had any problems related to SQLite. How long it lasts depends (obviously) on the amount of data you're pushing through on average. For the NOR device, I implemented a test system with SQLite, set up a simulator to model worst-case conditions for the device so that it was writing to the database about as much as it ever would, and hooked the MTD layer to count the number of erased blocks over a pre-defined period of time. You can then use that rate and the size of the partition to figure out how long it'll take to hit e.g. 100k erase cycles over the whole device. For SD you don't know how well it's doing wear-leveling behind the scenes, so throw in a multiplier to account for that, and you'll at least get an order-of-magnitude accurate idea of how long it'll last worst-case. -- Matthew L. Creech _______________________________________________ sqlite-users mailing list sqlite-users@sqlite.org http://sqlite.org:8080/cgi-bin/mailman/listinfo/sqlite-users
