Oracle DBA 必须掌握的 查询脚本：

Oracle  DBA 必须掌握的 查询脚本：

1：通过v$parameter数据字段来查询oracle标准数据块的大小

  1 ----通过 v$parameter数据字典来查询oracle标准数据块的大小。
  2 [email protected]> startup
  3 ORACLE instance started.
  4
  5 Total System Global Area 1221992448 bytes
  6 Fixed Size                  1344596 bytes
  7 Variable Size             771754924 bytes
  8 Database Buffers          436207616 bytes
  9 Redo Buffers               12685312 bytes
 10 Database mounted.
 11 Database opened.
 12 [email protected]> col name format a30;
 13 [email protected]> col value format a20;
 14 [email protected]> select name,value from v$parameter where name=‘db_block_size‘;
 15
 16 NAME                           VALUE
 17 ------------------------------ --------------------
 18 db_block_size                  8192
 19
 20 [email protected]> show parameter db_block
 21
 22 NAME                                 TYPE        VALUE
 23 ------------------------------------ ----------- ------------------------------
 24 db_block_buffers                     integer     0
 25 db_block_checking                    string      FALSE
 26 db_block_checksum                    string      TYPICAL
 27 db_block_size                        integer     8192

2：通过　dict 查看数据库中数据字典的信息

  1 [email protected]> col table_name for a30;
  2 [email protected]> col comments for a30;
  3 [email protected]> select * from dict;
  4
  5 TABLE_NAME                     COMMENTS
  6 ------------------------------ ------------------------------
  7 DBA_CONS_COLUMNS               Information about accessible c
  8                                olumns in constraint definitio
  9                                ns
 10
 11 DBA_LOG_GROUP_COLUMNS          Information about columns in l
 12                                og group definitions
 13
 14 DBA_LOBS                       Description of LOBs contained
 15                                in all tables
 16
 17 DBA_CATALOG                    All database Tables, Views, Sy

3 : 通过 v$fixed_view_definition 查看数据库中内部系统表的信息

  1 [email protected]> col view_name format a15;
  2 [email protected]> col view_definition format a30000;
  3 [email protected]>  select * from v$fixed_view_definition where rownum<=10;
  4
  5 VIEW_NAME              VIEW_DEFINITION
  6 ----------------------------------------------------------------------------------------------
  7 GV$WAITSTAT             select inst_id,decode(indx,1,‘data block‘,2,‘sort block‘,3,‘save undo block‘, 4,
  8 ‘segment header‘,5,‘save undo header‘,6,‘free list‘,7,‘extent map‘, 8,‘1st level
  9  bmb‘,9,‘2nd level bmb‘,10,‘3rd level bmb‘, 11,‘bitmap block‘,12,‘bitmap index b
 10 lock‘,13,‘file header block‘,14,‘unused‘, 15,‘system undo header‘,16,‘system und
 11 o block‘, 17,‘undo header‘,18,‘undo block‘), count,time from x$kcbwait where ind
 12 x!=0

4：通过查询 dba_data_files  数据来了解Oracle系统的数据文件信息

  1 [[email protected] ~]$ sqlplus / as sysdba;
  2
  3 SQL*Plus: Release 11.2.0.3.0 Production on Thu Dec 8 23:27:12 2016
  4
  5 Copyright (c) 1982, 2011, Oracle.  All rights reserved.
  6
  7
  8 Connected to:
  9 Oracle Database 11g Enterprise Edition Release 11.2.0.3.0 - Production
 10 With the Partitioning, OLAP, Data Mining and Real Application Testing options
 11
 12 [email protected]> col file_name format a50;
 13 [email protected]> set linesize3000;
 14 [email protected]> select file_name,tablespace_name from dba_data_files where rownum<=10;
 15
 16 FILE_NAME                                          TABLESPACE_NAME
 17 -------------------------------------------------- ------------------------------
 18 /u01/app/oracle/oradata/orcl/users01.dbf           USERS
 19 /u01/app/oracle/oradata/orcl/undotbs01.dbf         UNDOTBS1
 20 /u01/app/oracle/oradata/orcl/sysaux01.dbf          SYSAUX
 21 /u01/app/oracle/oradata/orcl/system01.dbf          SYSTEM
 22 /u01/app/oracle/oradata/orcl/example01.dbf         EXAMPLE
 23
 24 [email protected]>

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