REF
http://blog.itpub.net/23556054/viewspace-1115506/
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查看 oracle 数据库是否启动：
一、LINUX:
1、用 ps -ef|grep ora 查看,是否有oracle的进程,linux下还可以用ipcs查看
2、查看监听的方法
cd /oracle/product/10.2.0/db_1/bin/
lsnrctl status
启动监听
lsnrctl start
Message 1053 not found; No message file for product=network, facility=TNSMessage 1020 not found; No message file for product=network, facility=TNSMessage 1021 not found; No message file for product=network, facility=TNSMessage 1022 not found; No message file for product=network, facility=TNSMessage 1023 not found; No message file for product=network, facility=TNSMessage 1026 not found; No message file for product=network, facility=TNSMessage 1034 not found; No message file for product=network, facility=TNSMessage 1024 not found; No message file for product=network, facility=TNSMessage 1025 not found; No message file for product=network, facility=TNSMessage 1040 not found; No message file for product=network, facility=TNSMessage 1033 not found; No message file for product=network, facility=TNSMessage 1028 not found; No message file for product=network, facility=TNSMessage 1415 not found; No message file for product=network, facility=TNS Message 1050 not found; No message file for product=network, facility=TNS
Message 1050 not found; No message file for product=network, facility=TNS
Message 1029 not found; No message file for product=network, facility=TNSMessage 1411 not found; No message file for product=network, facility=TNS
Message 1408 not found; No message file for product=network, facility=TNS
Message 1408 not found; No message file for product=network, facility=TNS
Message 1411 not found; No message file for product=network, facility=TNS
Message 1408 not found; No message file for product=network, facility=TNS
Message 1411 not found; No message file for product=network, facility=TNS
Message 1408 not found; No message file for product=network, facility=TNS
Message 1052 not found; No message file for product=network, facility=TNS#
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二、windows:
进到数据库里面看数据库当前状态
select instance_name,status from v$instance;
如果status = open 就说明oracle服务正常。
查看监听，执行lsnrctl status，就可以看监听所对应的实例。
是否有scott用户，可以查看dba_users这个表的用户状态。
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三、检查操作系统空间使用状态
Linux命令：df -h或df -g
window:查看磁盘管理器
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四、表空间检查
1、select tablespace_name,sum(bytes)/1024/1024 as total_size
from dba_data_files
group by tablespace_name
2、select tablespace_name,sum(bytes)/1024/1024 as total_size
from dba_free_space
group by tablespace_name
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五、启动过程：
sqlplus /nolog or (sqlplus sys/passwd as sysdba)
conn sys/password as sysdba
SQL> select status from v$instance
ORA-01034: ORACLE not available ------------shutdown
SQL> startup nomount ------------started
SQL> alter database mount ------------mounted
SQL> alter database open ------------open
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6、检查表空间碎片
select tablespace_name, sqrt(MAX(blocks)/sum(blocks))*(100/sqrt(sqrt(COUNT(blocks)))) as
"FSFI%"
from dba_free_space
group by tablespace_name
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