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HomeDatabaseMysql Tutorial 《Oracle DBA日常工作和职责》

《OracleDBA日常工作和职责》1.数据库环境LEO1@LEO1select*fromv$version;BANNER---------------------------------------------------------------------------

《Oracle DBA日常工作和职责》

1.数据库环境

LEO1@LEO1> select * from v$version;

BANNER

--------------------------------------------------------------------------------

Oracle Database 11g Enterprise Edition Release 11.2.0.1.0 - 64bit Production

PL/SQL Release 11.2.0.1.0 - Production

CORE    11.2.0.1.0      Production

TNS for Linux: Version 11.2.0.1.0 - Production

NLSRTL Version 11.2.0.1.0 - Production

2.用SQL计算出你所用数据库的总容量,给出SQL语句和结果。

如果要计算数据库的总容量就需要知道数据库由哪几部分组成的,然后计算每部分的容量之和即可

(1)数据文件

路径:/u01/app/oracle/oradata/LEO1/

数据文件名           字节           M

leo1_01.dbf           419438592      400M

sysaux01.dbf          639639552      610M

system01.dbf          734011392      700M

undotbs01.dbf         173023232      165M

users01.dbf            5251072        5M

我们看一下对应表空间的使用情况

LEO1@LEO1> select df.tablespace_name "表空间名",totalspace "总空间M",freespace "剩余空间M",round((1-freespace/totalspace)*100,2) "使用率%"

from

(select tablespace_name,round(sum(bytes)/1024/1024) totalspace from dba_data_files group by tablespace_name) df,

(select tablespace_name,round(sum(bytes)/1024/1024) freespace from dba_free_space group by tablespace_name) fs

where df.tablespace_name=fs.tablespace_name order by df.tablespace_name ;  2    3    4    5  

表空间名            总空间M   剩余空间M   使用率%

--------------------------------------------------------------------------------------

LEO1                400           237      40.75

SYSAUX              610           31       94.92

SYSTEM              700           8        98.86

UNDOTBS1           165           137      16.97

USERS               5             4        20

(2)临时文件

路径:/u01/app/oracle/oradata/LEO1/

临时文件名           字节            M

temp01.dbf           128983040       123

我们看一下对应表空间的使用情况

LEO1@LEO1> select file_name,tablespace_name,bytes/1024/1024,user_bytes/1024/1024 from dba_temp_files;

FILE_NAME                              TABLESPACE_NAME         BYTES/1024/1024

--------------------------------------------------------------------------------------------------------------------------------------------

/u01/app/oracle/oradata/LEO1/temp01.dbf    TEMP                    123                  

(3)重做日志文件

路径:/u01/app/oracle/oradata/LEO1/

重做日志文件名     字节             M

redo01.log          52429312         50

redo02.log          52429312         50

redo03.log          52429312         50

三个是镜像关系,所以大小都一样

(4)控制文件

路径:/u01/app/oracle/oradata/LEO1/

控制文件名        字节              M

control01.ctl        9748480          9.29

control02.ctl        9748480          9.29

control03.ctl        9748480          9.29

三个也是镜像关系,所以大小都一样,控制文件的大小会根据数据库结构的变化而变化

(5)参数文件

路径:/u01/app/oracle/product/11.2.0/db_1/dbs

参数文件名        字节              M

spfileLEO1.ora       2560             0.003

参数文件是描述数据库属性的,记录了数据库非默认值的所有初始化参数

(6)告警日志

路径:/u01/app/oracle/diag/rdbms/leo1/LEO1/trace

告警日志          字节              M

alert_LEO1.log      2271951           2.166

告警日志记录数据库中所有的报错信息,会随着信息量的多少而变化,我们也可以清空告警日志

(7)密码文件

路径:/u01/app/oracle/product/11.2.0/db_1/dbs

密码文件名        字节              M

orapwLEO1         1536             0.002

密码文件保存着数据库管理员信息(ID passwd),只要数据库添加管理员就会在这里添加对应的信息

(8)dump文件和归档日志

Adump

Bdump

Cdump

Udump

这些都是记录数据库信息的日志文件,把它们的容量加在一起就是数据库总容量了

数据库容量公式:数据文件+临时文件+重做日志文件+控制文件+参数文件+告警日志+密码文件+……

Count:(400+610+700+165+5)+123+(50+50+50)+(9.29+9.29+9.29)+0.003+2.166+0.002=2183.041M

小结:所谓数据库就是文件的集合,那么数据库容量就是文件集合的容量。

3.用SQL计算出某个用户下所有对象的大小,给出SQL语句和结果。

我们要计算用户的所有对象就是计算一个schema的大小

段对象:凡是分配存储空间的对象就叫段对象

我最常用的用户名LEO1,下面我们就来看看这个用户的schema的所有对象

LEO1@LEO1> select owner,segment_name,segment_type,partition_name,bytes from dba_segments where owner='LEO1';

OWNER    SEGMENT_NAME   SEGMENT_TYPE     PARTITION_NAME       BYTES

------------------------------ ---------------------------------------- ------------------ -------------------- ----------

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