Oracle数据库初探

select userenv(‘language‘) from dual 其中NLS_CHARACTERSET 为server端字符集 NLS_LANGUAGE 为 server端字符显示形式 B、查询oracle client端的字符集 $echo $NLS_LANG 如果发现你select 出来的数据是乱码，请把client端的字符集配置成与linux操作系统相同的字符集。如果还是有乱码，则有可能是数据库中的数据存在问题，或者是oracle服务端的配置存在问题。 C、server端字符集修改 ***************************************************************** * 更改字符集步骤方法(WE8ISO8859P1 --> ZHS16GBK) * ***************************************************************** SQL> 将数据库启动到RESTRICTED模式下做字符集更改： SQL> conn /as sysdba Connected. SQL> shutdown immediate; Database closed. Database dismounted. ORACLE instance shut down. SQL> startup mount ORACLE instance started. Total System Global Area 236000356 bytes Fixed Size 451684 bytes Variable Size 201326592 bytes Database Buffers 33554432 bytes Redo Buffers 667648 bytes Database mounted. SQL> ALTER SYSTEM ENABLE RESTRICTED SESSION; System altered. SQL> ALTER SYSTEM SET JOB_QUEUE_PROCESSES=0; System altered. SQL> ALTER SYSTEM SET AQ_TM_PROCESSES=0; System altered. SQL> alter database open; Database altered. SQL> ALTER DATABASE CHARACTER SET ZHS16GBK; ALTER DATABASE CHARACTER SET ZHS16GBK * ERROR at line 1: ORA-12712: new character set must be a superset of old character set 提示我们的字符集：新字符集必须为旧字符集的超集，这时我们可以跳过超集的检查做更改： SQL> ALTER DATABASE character set INTERNAL_USE ZHS16GBK; Database altered. SQL> select * from v$nls_parameters; 略 19 rows selected. 重启检查是否更改完成： SQL> shutdown immediate; Database closed. Database dismounted. ORACLE instance shut down. SQL> startup ORACLE instance started. Total System Global Area 236000356 bytes Fixed Size 451684 bytes Variable Size 201326592 bytes Database Buffers 33554432 bytes Redo Buffers 667648 bytes Database mounted. Database opened. SQL> select * from v$nls_parameters; 略 19 rows selected. +++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++

　　怎么打开数据库，监听器？

　　

1. linux下启动oracle 
su - oracle 
sqlplus /nolog 
conn /as sysdba 
startup 
exit 
lsnrctl start 
exit 

2. linux下关闭oracle 
su - oracle 

sqlplus /nolog 

conn /as sysdba 

shutdown immediate 

exit 

lsnrctl stop 

exit 

3、启动监听器 
oracle@suse92:~> lsnrctl start 
4、停止监听器 
oracle@suse92:~> lsnrctl stop 
5、查看监听器状态 
oracle@suse92:~> lsnrctl 
LSNRCTL> status 
LSNRCTL> exit 

　　 怎样设置Oracle数据库最大链接？

　　找到 $ORACLE_HOME/network/admin/listener.ora,加上下面的

SID_LIST_LISTENER=
  (SID_LIST=
      (SID_DESC=
          #BEQUEATH CONFIG
         (GLOBAL_DBNAME=orcl)
         (SID_NAME=orcl)
         (ORACLE_HOME=/u01/oracle)
         #PRESPAWN CONFIG
        (PRESPAWN_MAX=20)
        (PRESPAWN_LIST=
          (PRESPAWN_DESC=(PROTOCOL=tcp)(POOL_SIZE=2)(TIMEOUT=1))
        )
    )
)

　　设置还原点，闪回点，有现成的，我就不多费口舌了，有问题随时baidu.com

　　还原点简单的使用：http://blog.csdn.net/u012702547/article/details/46679095

　　闪回还原点：http://blog.itpub.net/29800581/viewspace-1314515/

 

Oracle数据库初探

标签：pen   div   否则   http   sid_name   suse   使用   没有   ace