Re: online backup and alter system switch logfile

On Wed, 29 May 2002, Dave Morgan wrote:

> You do not need to archive the log files.
>
> Alter system switch logfile does not return until
> the logfile is written to disk.

This is demonstrably untrue, and incredibly easy to disprove. Try it yourself!

SQL> select group#, sequence#, archived, status, first_time from v$log order by sequence#;

    GROUP# SEQUENCE# ARC STATUS FIRST_TIME

---------- ---------- --- ---------------- ----------------
         5      54283 YES INACTIVE         2002-05-29:16:13
         4      54284 YES INACTIVE         2002-05-29:17:15
         1      54285 NO  CURRENT          2002-05-29:17:17

SQL> alter system switch logfile;
System altered.

SQL> select group#, sequence#, archived, status, first_time from v$log order by sequence#;

    GROUP# SEQUENCE# ARC STATUS FIRST_TIME

---------- ---------- --- ---------------- ----------------
         1      54284 YES INACTIVE         2002-05-29:17:15
         2      54285 NO  ACTIVE           2002-05-29:17:17
         3      54286 NO  CURRENT          2002-05-29:17:26

--
Jeremiah Wilton
http://www.speakeasy.net/~jwilton



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