关于oracle redo log buffer 你所不知道的东西

[ora11@lixora ~]$ sqlplus / as sysdba

SQL*Plus: Release 11.2.0.1.0 Production on Wed Oct 8 09:57:50 2014

Copyright (c) 1982, 2009, Oracle.  All rights reserved.

Connected to:
Oracle Database 11g Enterprise Edition Release 11.2.0.1.0 - 64bit Production
With the Partitioning, OLAP, Data Mining and Real Application Testing options

SQL>
SQL>
SQL>
SQL> select database_role from v$database;

DATABASE_ROLE
--------------------------------
PRIMARY

SQL> SELECT x.ksppinm NAME, y.ksppstvl VALUE, x.ksppdesc describ
  2  FROM SYS.x$ksppi x, SYS.x$ksppcv y
  3  WHERE x.inst_id = USERENV ('Instance')
  4  AND y.inst_id = USERENV ('Instance')
  5  AND x.indx = y.indx
  6  AND x.ksppinm LIKE '%&par%'
  7  /
Enter value for par: _log_paralle
old   6: AND x.ksppinm LIKE '%&par%'
new   6: AND x.ksppinm LIKE '%_log_paralle%'

NAME
--------------------------------------------------------------------------------
VALUE
--------------------------------------------------------------------------------
DESCRIB
--------------------------------------------------------------------------------
_log_parallelism_max
1
Maximum number of log buffer strands

_log_parallelism_dynamic
TRUE
Enable dynamic strands