Oracle DBA 必须掌握的 查询脚本：

----通过 v$parameter数据字典来查询oracle标准数据块的大小。 2 SYS@orcl> startup 3 ORACLE instance started. 4 5 Total System Global Area 1221992448 bytes 6 Fixed Size 1344596 bytes 7 Variable Size 771754924 bytes 8 Database Buffers 436207616 bytes 9 Redo Buffers 12685312 bytes 10 Database mounted. 11 Database opened. 12 SYS@orcl> col name format a30; 13 SYS@orcl> col value format a20; 14 SYS@orcl> select name,value from v$parameter where name=‘db_block_size‘; 15 16 NAME VALUE 17 ------------------------------ -------------------- 18 db_block_size 8192 19 20 SYS@orcl> 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 SYS@orcl> col table_name for a30;
  2 SYS@orcl> col comments for a30;
  3 SYS@orcl> 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 SYS@orcl> col view_name format a15;
  2 SYS@orcl> col view_definition format a30000;
  3 SYS@orcl>  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 [oracle@localhost ~]$ 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 SYS@orcl> col file_name format a50;
 13 SYS@orcl> set linesize3000;
 14 SYS@orcl> 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 SYS@orcl>

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Oracle DBA 必须掌握的 查询脚本：

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