关于oracle redo log buffer 你所不知道的东西

[[email protected] ~]$ 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