Oracle数据库日常巡检基本状况
1.检查Oracle实例状态
select instance_name,host_name,startup_time,status,database_status from v$instance;
其中“STATUS”表示Oracle当前的实例状态，必须为“OPEN”；“DATABASE_STATUS”表示Oracle当前数据库的状态，必须为“ACTIVE”。
SQL> select instance_name,host_name,startup_time,status,database_status from v$instance;
INSTANCE_NAME
--------------------------------
HOST_NAME
--------------------------------------------------------------------------------
STARTUP_TIME STATUS DATABASE_STATUS
------------ ------------------------ ----------------------------------
orcl
localhost.localdomain
13-OCT-20 OPEN ACTIVE
2.检查Oracle在线日志状态
select group#,status,type,member from v$logfile;
输出结果应该有3条以上（包含3条）记录，“STATUS”应该为非“INVALID”，非“DELETED”。注：“STATUS”显示为空表示正常。
SQL> select group#,status,type,member from v$logfile;
GROUP# STATUS TYPE
---------- -------------- --------------
MEMBER
--------------------------------------------------------------------------------
3 ONLINE
/data/oracle/oradata/orcl/redo03.log
2 ONLINE
/data/oracle/oradata/orcl/redo02.log
1 ONLINE
/data/oracle/oradata/orcl/redo01.log
3.v检查Oracle表空间的状态
select tablespace_name,status from dba_tablespaces;
输出结果中STATUS应该都为ONLINE。
SQL> select tablespace_name,status from dba_tablespaces;
TABLESPACE_NAME STATUS
------------------------------------------------------------ ------------------
SYSTEM ONLINE
SYSAUX ONLINE
UNDOTBS1 ONLINE
TEMP ONLINE
USERS ONLINE
EXAMPLE ONLINE
6 rows selected.
4.检查Oracle所有数据文件状态
select name,status from v$datafile;
输出结果中“STATUS”应该都为“ONLINE”。或者”SYSTEM”。
select file_name,status from dba_data_files;
输出结果中“STATUS”应该都为“AVAILABLE”。
SQL> select name,status from v$datafile;
NAME
--------------------------------------------------------------------------------
STATUS
--------------
/data/oracle/oradata/orcl/system01.dbf
SYSTEM
/data/oracle/oradata/orcl/sysaux01.dbf
ONLINE
/data/oracle/oradata/orcl/undotbs01.dbf
ONLINE
NAME
--------------------------------------------------------------------------------
STATUS
--------------
/data/oracle/oradata/orcl/users01.dbf
ONLINE
/data/oracle/oradata/orcl/example01.dbf
ONLINE
5.检查表空间使用情况
select a.tablespace_name,a.bytes/1024/1024 "Sum MB",(a.bytes-b.bytes)/1024/1024 "used MB",b.bytes/1024/1024 "free MB",
round(((a.bytes-b.bytes)/a.bytes)*100,2) "percent_used"
from
(select tablespace_name,sum(bytes) bytes from dba_data_files group by tablespace_name) a,
(select tablespace_name,sum(bytes) bytes,max(bytes) largest from dba_free_space group by tablespace_name) b
where a.tablespace_name=b.tablespace_name
order by ((a.bytes-b.bytes)/a.bytes) desc;
输出结果中tablespace_name=xxxx（表名）的记录”free MB”应该在1024以上
SQL> select a.tablespace_name,a.bytes/1024/1024 "Sum MB",(a.bytes-b.bytes)/1024/1024 "used MB",b.bytes/1024/1024 "free MB",
2 round(((a.bytes-b.bytes)/a.bytes)*100,2) "percent_used"
3 from
4 (select tablespace_name,sum(bytes) bytes from dba_data_files group by tablespace_name) a,
5 (select tablespace_name,sum(bytes) bytes,max(bytes) largest from dba_free_space group by tablespace_name) b
6 where a.tablespace_name=b.tablespace_name
7 order by ((a.bytes-b.bytes)/a.bytes) desc;
TABLESPACE_NAME Sum MB
------------------------------------------------------------ ----------
used MB free MB percent_used
---------- ---------- ------------
SYSTEM 670
667.5625 2.4375 99.64
SYSAUX 500
467.9375 32.0625 93.59
UNDOTBS1 60
54.375 5.625 90.63
TABLESPACE_NAME Sum MB
------------------------------------------------------------ ----------
used MB free MB percent_used
---------- ---------- ------------
USERS 5
4.0625 .9375 81.25
EXAMPLE 100
78.4375 21.5625 78.44