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From Melvin Davidson
Subject Time travel?
Date
Msg-id CANu8Fiy5Lya3Qre6oekwamM_5BJsbabwSSOpNXRtTXYaNqMTjA@mail.gmail.com
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Re: Time travel?
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So here is a strange question.
 
I am using PostgreSQL 9.4.0 (Yes, I know 9.4.9 is most recent but it's out of my control)
 O/S is AWS Debian 3.16.7-2 (2014-11-06) x86_64 GNU/Linux.
 
I list the creation time for a WAL file and it shows:

 /home/mdavidson/dba$ ls -l --time=ctime /d-log/pg_xlog/000000010000000D000000C9
-rw------- 1 postgres postgres 16777216 Sep 29 07:14 /d-log/pg_xlog/000000010000000D000000C9

but then I list the access time for a WAL file and it shows:
 /home/mdavidson/dba$ ls -l --time=atime /d-log/pg_xlog/000000010000000D000000C9
-rw------- 1 postgres postgres 16777216 Sep  7 14:33 /d-log/pg_xlog/000000010000000D000000C9

How is it possible for the WAL file to be accessed BEFORE it was created?
Am I overlooking something simple?
 
Melvin Davidson


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