At 10:19 21/06/2006, you wrote:
Hi,all
I'm trying to bulid a database engine based on uc/os-II RTOS with my
own customized file system(similar with FAT16, but not exactly the
same). I find that SQLite is a good choice.
SQLite is the best choice, we have it running in a PPC440GX embedded
system and run without problems. About the filesystem, don't know, we
use a ram disk driver (2GB) with minimal filesystem, and make copies
to a external hard disk via ethernet at fixed times. Also, disabled
SQLite cache. Ram has lower consums and fills less space in our
device than hard disks.
Another question:
Because my project will run in an embedded environment, so I have to
take care of the RAM consumption. I have went through the mail list,
but not found the description of minimum RAM usage.
Could anyone tell me how much RAM is needed to run SQLite in an
embedded environment?
SQLite + OS code can be fitted in a 512 sram module (copied from
flash at startup), and data in dram modules. There is no minimum ram
because you can force SQLite to use hard disk as temp
(http://www.sqlite.org/pragma.html), except for the cache which will
take your page_size (1KB default) + 0.5 KB for each page cached. I
suppouse that master tables are ram based also, don't know, but
theirs size is minimal.
HTH
