管理Oracle时常用的数据字典和动态性能视图
管理Oracle时常用的数据字典和动态性能视图
1.v$version
查询数据库版本信息
select * from v$version;
BANNER -------------------------------------------------------------------------------- Oracle Database 11g Enterprise Edition Release 11.2.0.3.0 - 64bit Production PL/SQL Release 11.2.0.3.0 - Production CORE 11.2.0.3.0 Production TNS for Solaris: Version 11.2.0.3.0 - Production NLSRTL Version 11.2.0.3.0 - Production
2.v$sgainfo
查询sga中的相关信息
select name, bytes/1024/1024"Size(M)"from v$sgainfo;
NAME Size(M) -------------------------------- ---------- Fixed SGA Size 2.12744903 Redo Buffers 2.19921875 Buffer Cache Size 300 Shared Pool Size 216 Large Pool Size 4 Java Pool Size 4 Streams Pool Size 4 Shared IO Pool Size 0 Granule Size 4 Maximum SGA Size 816.328125 Startup overhead in Shared Pool 68.5404663 Free SGA Memory Available 284
3.v$parameter
查询初始化参数相关信息
select name,valuefrom v$parameterwhere name like'%pool%';
NAME VALUE -------------------------------------------------------------------------------- ---------------------------------------------------- shared_pool_size 0 large_pool_size 0 java_pool_size 0 streams_pool_size 0 shared_pool_reserved_size 10905190 buffer_pool_keep buffer_pool_recycle global_context_pool_size olap_page_pool_size 0 9 rows selected
4.v$sysstat和v$statname
v$sysstat是统计信息，v$statname用于显示从v$sesstat和v$sysstat解析过的统计名。比如，确定系统总的事务量，可以：
select a.value as "TransactionCount" from v$sysstat a, v$statname b where a.statistic# = b.statistic# and b.name = 'user commits';
TransactionCount
----------------
6954
5.v$instance
这个v$视图显示当前实例的状态。比如，要确定系统总的运行时间：
select (sysdate - startup_time)*24*60*60 as seconds from v$instance;
SECONDS
----------
34183
6.v$session
查询会话信息。比如：
select username, sid, serial# from v$session where username is not null;
USERNAME SID SERIAL# ------------------------------ ---------- ---------- SYS 1 7 SYSMAN 32 165 SYSMAN 33 25 SYSMAN 35 55 SYS 37 1065 SYS 38 3205 SYSMAN 39 3 SYS 42 5039 SYSMAN 43 49 SYSMAN 44 97 SYSMAN 45 29 DBSNMP 46 95 SYSMAN 47 359 DBSNMP 48 893 SYSMAN 51 13 SYS 57 2345
7.v$sql
查询sql相关信息。如下：
select sql_text, parse_calls, loads, executions from v$sql where upper(sql_text)like'。。。';
8.v$process和v$bgprocess
进程和后台进程相关信息，比如：
select p.pid, p.spid, b.name, b.description from v$process p, v$bgprocess b where p.addr = b.paddr and b.paddr <>'00';
PID SPID NAME DESCRIPTION
---------- ------------------------ ----- ----------------------------------------------------------------
2 808 PMON process cleanup
3 810 PSP0 process spawner 0
4 812 VKTM Virtual Keeper of TiMe process
5 816 GEN0 generic0
6 818 DIAG diagnosibility process
7 820 DBRM DataBase Resource Manager
8 822 DIA0 diagnosibility process 0
9 824 MMAN Memory Manager
10 826 DBW0 db writer process 0
11 828 LGWR Redo etc.
12 830 CKPT checkpoint
13 832 SMON System Monitor Process
14 834 RECO distributed recovery
15 836 MMON Manageability Monitor Process
16 838 MMNL Manageability Monitor Process 2
20 852 ARC0 Archival Process 0
21 854 ARC1 Archival Process 1
22 856 ARC2 Archival Process 2
23 858 ARC3 Archival Process 3
24 860 QMNC AQ Coordinator
PID SPID NAME DESCRIPTION
---------- ------------------------ ----- ----------------------------------------------------------------
25 874 CJQ0 Job Queue Coordinator
28 908 SMCO Space Manager Process
22 rows selected
9.dba_tablespaces
select tablespace_name, status, contents from dba_tablespaces;
TABLESPACE_NAME STATUS CONTENTS ------------------------------ --------- --------- SYSTEM ONLINE PERMANENT SYSAUX ONLINE PERMANENT UNDOTBS1 ONLINE UNDO TEMP ONLINE TEMPORARY USERS ONLINE PERMANENT EXAMPLE ONLINE PERMANENT STU ONLINE PERMANENT 7 rows selected
10.user_segments
查看段信息。比如：
select segment_name, segment_type, tablespace_name, bytes/1024"Size(KB)", extents, blocks from user_segments where segment_name ='DEPT'
SEGMENT_NAME SEGMENT_TYPE TABLESPACE_NAME Size(KB) EXTENTS BLOCKS ------------------------------ ------------------ ------------------------------ ---------- ---------- ---------- DEPT TABLE USERS 64 1 8
11.user_extents
查看区段信息。比如：
select segment_name, tablespace_name, extent_id, bytes/1024"Size(KB)", blocks from user_extents where segment_name ='DEPT';
SEGMENT_NAME TABLESPACE_NAME EXTENT_ID Size(KB) BLOCKS ------------------------------ ------------------------------ ---------- ---------- ---------- DEPT USERS 0 64 8
12.dba_data_files
查看数据文件相关信息。比如：
select file_id, file_name, tablespace_name from dba_data_files;
FILE_ID FILE_NAME TABLESPACE_NAME
---------- -------------------------------------------------------------------------------- ------------------------------
4 /u01/oradata/mike/users01.dbf USERS
3 /u01/oradata/mike/undotbs01.dbf UNDOTBS1
2 /u01/oradata/mike/sysaux01.dbf SYSAUX
1 /u01/oradata/mike/system01.dbf SYSTEM
5 /u01/oradata/mike/example01.dbf EXAMPLE
6 /u01/oradata/mike/stu01.dbf STU
7 /u01/oradata/mike/undotbs02.dbf UNDOTBS1
7 rows selected
13.dba_temp_files
查看临时表数据文件信息。比如：
select file_id, file_name, tablespace_name from dba_temp_files;
FILE_ID FILE_NAME TABLESPACE_NAME
---------- -------------------------------------------------------------------------------- ------------------------------
1 /u01/oradata/mike/temp01.dbf TEMP