| From: | Michael Paquier <michael(dot)paquier(at)gmail(dot)com> |
|---|---|
| To: | DEV_OPS <devops(at)ww-it(dot)cn> |
| Cc: | PostgreSQL mailing lists <pgsql-hackers(at)postgresql(dot)org>, computer_wg(at)163(dot)com |
| Subject: | Re: xlogfilename |
| Date: | 2017-07-20 09:02:25 |
| Message-ID: | CAB7nPqQ+OJDNFiXuMB-pEZGGUQyf2a6tu3EV7kPQ5Q2=xZ9NAg@mail.gmail.com |
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| Lists: | pgsql-hackers |
On Thu, Jul 20, 2017 at 10:58 AM, DEV_OPS <devops(at)ww-it(dot)cn> wrote:
> I think you may reference to function: pg_xlogfile_name in
> src/backend/access/transam/xlogfuncs.c, it use XLogFileName defined in
> src/include/access/xlog_internal.h
>
> #define XLogFileName(fname, tli, logSegNo) \
> snprintf(fname, MAXFNAMELEN, "%08X%08X%08X", tli, \
> (uint32) ((logSegNo) / XLogSegmentsPerXLogId), \
> (uint32) ((logSegNo) % XLogSegmentsPerXLogId))
>
>
> hope it's helpful for you
The first 8 characters are the timeline number in hexadecimal format.
The next 8 characters indicate a segment number, which gets
incremented every 256 segments in hexa format. The last 8 characters
indicate the current segment number in hexa format.
--
Michael
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