15 seconds for the archiving of newspapers is acceptable?

Version: 11.2.0.3
Platform: RHEL 5.4

3-node RAC
DB in ARCHIVELOG mode

Question1
============

As you can see below sometimes it takes up to 15 seconds for the archiving of recovery logs.

Online redo log switch happens fast however. It takes less than 2 seconds (maybe not fast enough for you guys)

Is this acceptable?


--- Log archiving is slow

SQL> set timing on
SQL> alter system archive log current;

System altered.

Elapsed: 00:00:11.08
SQL>
SQL>
SQL> alter system archive log current;

System altered.

Elapsed: 00:00:10.77
SQL> alter system archive log current;

System altered.

Elapsed: 00:00:15.06
SQL>
SQL>

-- But log switching is fast !

SQL> alter system switch logfile;

System altered.

Elapsed: 00:00:01.89
SQL> alter system switch logfile;

System altered.

Elapsed: 00:00:00.21
Question2.
=========

For a database in archivelog mode, ALTER SYSTEM ARCHIVE LOG CURRENT and ALTER SYSTEM SWITCH LOGFILE have the same effect. Right? I mean, these two commands request the process archiving to archive the ENT which is currently written to. right?

It's fast enough, as long as you don't fill all redo it online until you have completed check-in first. This is a round robin, so if you get all the way around to the first which is still more archived, everything stops until it is done.

The ALTER SYSTEM ARCHIVE LOG CURRENT expected archiver finish archiving, is slower than ALTER SYSTEM SWITCH LOGFILE, perhaps very much so with the largest and redo.

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