On 10 Feb 2015, at 9:32am, 博协软件-张涛 <2718894...@qq.com> wrote:
> WHERE A POWER LOSS OR SIGNAL 'KILL -9' HAPPEND IN LINUX SYSTEM,HOW CAN I > MAKE SURE THE DB FILE HAVE THE fewest LOSS! At the same time, THE kernel > CPU period IN 30MS~50MS OR LESS. > > > I HAVE TRIED TO USE WAL JOURNAL MODE, IN THIS MODE ,when POWER DOWN OR > RESET, THE DB DATA IS OK ? WAL mode is no more safe or less safe than the original journal made. To make your database more safe 1) Keep it on the boot volume, not a network or external drive. 2) Set a long busy_timeout, perhaps several minutes. (see "PRAGMA busy_timeout") 3) PRAGMA synchronous = FULL The following things will make your journal less safe: 1) PRAGMA data_store_directory to anywhere other than the boot volume 2) PRAGMA ignore_check_constraints = YES 3) PRAGMA journal_mode = MEMORY 4) PRAGMA journal_mode = OFF 5) PRAGMA synchronous = OFF 6) PRAGMA temp_store_directory to anywhere other than the boot volume Do not do any of those things if you want your database to be as safe as possible. Simon. _______________________________________________ sqlite-users mailing list sqlite-users@sqlite.org http://sqlite.org:8080/cgi-bin/mailman/listinfo/sqlite-users
