>Hi
>
>We are evaluating various RDBMS for use on within an airborne server
>(Embedded NT4.0) environment.
>
>This environment does not have reliable power. Aircraft are powered cycled
>without regard for delicate OS environments etc.
Here in south Arlington, Va., the power also cycles without regard
for delicate OS environments. Is it impossible to install some sort
of UPS, along with software that shuts everything down gracefully
when the power goes off? This will also protect against less obvious
problems. My dial-up connection is lot more reliable when my
equipment is hooked up to a UPS.
>We like MySql because it is fairly lightweight (regards processor/mem
>requirements not capabilities) and fast. Availability of source code is also
>re-assuring - given the long product lifecycles within the avionics
>business.
>
>Assume that we are not suffering from any file corruption due to problems
>with NTFS under powerfail conditions.
>
>Whether we use a table type which supports transactions or not has anyone
>experienced problems under powerfail, and if they
>have could it be automatically corrected within a reasonable time by the
>table repair utilities. I am worried about internal indices (Btrees etc)
>requiring a complete rebuild, and taking an unacceptable amount of time.
Roughly half the crashes I've experienced have resulted in corrupted
tables. I've always been able to repair them with the mysamchk
utility.
>
>I plan to test before making any commitments but forwarned is forarmed as
>they say.
>
>Other DB's on the eval list are Interbase 6.0, MSQL7, various realtime
>embedded.
>
>Thanks & Regards
>
>Norman Burkies
>
>
>
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