Default value for log_buffer parameter

Giganews Newsgroups
Subject: Default value for log_buffer parameter
Posted by:  David Hollenberg (dholl…@marten.isi.edu)
Date: 26 Oct 2005

Using Oracle 10.2.0.1.0 on Solaris 9.
Value for parameter sga_target = 1G.  I let the value for parameter
log_buffer default.

SQL> show parameter log_buffer

NAME                                TYPE        VALUE
------------------------------------ ----------- ------------------------------
log_buffer                          integer    6203392

SQL> select name, value, isdefault from v$parameter
where name = 'log_buffer';

NAME                VALUE                ISDEFAULT
-------------------- -------------------- ---------
log_buffer          6203392              TRUE

Documentation says that redo log buffer size is controlled manually
(not part of automatic sizing) and has a default value of "512 KB or
128 KB * CPU_COUNT, whichever is greater".  Machine has 4 CPUs, so log
buffer size should be 512 KB.  Documentation bug or code bug?

--

David Hollenberg    dholl…@NOmosisSPAM.org  http://www.mosis.org/
MOSIS Service                            Voice 310-448-8704
Information Sciences Institute          FAX  310-823-5624

Replies