Please, don't forget my questions.
2012/9/10 Yongil Jang <[email protected]>
> Dear sqlite-users,
>
> I have a question about directory sync.
>
> Question: In case of journal file already exists on disk with persist
> journal mode,
> does it necessary to sync directory for first
> fsync(unixSync) call?
>
> AFAIK, directory sync should be called when a file is created or deleted.
> Does it mean that calling directory sync doesn't necessary for existing
> files?
>
> When I tested it with 1,000 insert queries, about 1,000 fsync calls were
> decreased on persist journal mode.
> To compare this, I just changed "unixOpen" function as like as follows.
>
> int syncDir = 0;
> if(isCreate && (eType==SQLITE_OPEN_MASTER_JOURNAL ||
> eType==SQLITE_OPEN_MAIN_JOURNAL || eType==SQLITE_OPEN_WAL))
> {
> int exists = 0;
> unixAccess(pVfs, zPath, SQLITE_ACCESS_EXISTS, &exists);
> if(!exists) {
> syncDir = 1;
> }
> }
>
> Thank you for reading this message.
>
> Best regards,
> YongIl Jang
>
>
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