管理Oracle時常用的數據字典和動態性能視圖
1.v$version
查詢數據庫版本信息
select * from v$version;BANNER
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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 - Production2.v$sgainfo
查詢sga中的相關信息
select name, bytes/1024/1024"Size(M)"from v$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 2843.v$parameter
查詢初始化參數相關信息
select name,valuefrom v$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 selected4.v$sysstat和v$statname
v$sysstat是統計信息，v$statname用於顯示從v$sesstat和v$sysstat解析過的統計名。比如，確定系統總的事務量，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
----------------
69545.v$instance
這個v$視圖顯示當前實例的狀態。比如，要確定系統總的運行時間：
select (sysdate - startup_time)*24*60*60 as seconds from v$instance; SECONDS
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341836.v$session
查詢會話信息。比如：
select username, sid, serial# from v$session where username is not null;USERNAME SID SERIAL#
------------------------------ ---------- ----------
SYS 1 7
SYSMAN 32 165
SYSMAN 33 25
SYSMAN 35 55
SYS 37 1065
SYS 38 3205
SYSMAN 39 3
SYS 42 5039
SYSMAN 43 49
SYSMAN 44 97
SYSMAN 45 29
DBSNMP 46 95
SYSMAN 47 359
DBSNMP 48 893
SYSMAN 51 13
SYS 57 23457.v$sql
查詢sql相關信息。如下：
select sql_text, parse_calls, loads, executions from v$sql
where upper(sql_text)like'。。。';8.v$process和v$bgprocess
進程和後臺進程相關信息，比如：
select p.pid, p.spid, b.name, b.description from v$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 selected9.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 selected10.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 1 811.user_extents
查看區段信息。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 64 812.dba_data_files
查看數據文件相關信息。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 selected13.dba_temp_files
查看臨時表數據文件信息。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
