更改oracle 默认db_files 200（ORA-00059: maximum number of DB_FILES
ORA-00059: maximum number of DB_FILES exceeded
后查到：
db_files 值设的是 integer 200
RMAN> BACKUP CURRENT CONTROLFILE FORMAT '/home/bak/20150612/cntrl_%s_%p_%t';
RMAN> BACKUP Spfile FORMAT '/home/bak/20150612/spfile_%s_%p_%t';
cat /home/db/oracle10g/product/10.2.0/db_1/network/admin/listener.ora
由于要重启库生效，故先停监听：
lsnrctl stop LISTENER1
netstat -an|grep 11521
SQL> show parameter db_files;
NAME TYPE VALUE
------------------------------------ ----------- ------------------------------
db_files integer 200
SQL> alter system set db_files=1024 scope=spfile;
System altered.
SQL> show parameter db_files;
NAME TYPE VALUE
------------------------------------ ----------- ------------------------------
db_files integer 200
SQL>
SQL> shutdown immediate;
Database closed.
Database dismounted.
ORACLE instance shut down.
SQL> startup
ORACLE instance started.
Total System Global Area 6815744000 bytes
Fixed Size 2133456 bytes
Variable Size 3812622896 bytes
Database Buffers 2990538752 bytes
Redo Buffers 10448896 bytes
Database mounted.
Database opened.
SQL>
SQL> show parameter db_files;
NAME TYPE VALUE
------------------------------------ ----------- ------------------------------
db_files integer 1024
lsnrctl start LISTENER1起监听 恢复
===========
花絮期间在停库时，观察alert日志：
Stopping background process MMNL
Fri Jun 12 19:15:12 2015
Stopping background process MMON
Fri Jun 12 19:15:13 2015
Shutting down instance (immediate)
License high water mark = 141
Fri Jun 12 19:15:13 2015
Stopping Job queue slave processes, flags = 7
Fri Jun 12 19:15:13 2015
Job queue slave processes stopped
Fri Jun 12 19:20:12 2015
Active call for process 11403540 user 'oracle10g' program 'oracle@XXDB3300'
SHUTDOWN: waiting for active calls to complete.
等了许久于是
ps -ef|grep 11403540
oracle10 11403540 1 100 Mar 18 - 78207:11 oracleecssdb (LOCAL=NO)
kill -9 11403540
后续数据库正常停下来