Oracle11g 体系结构

Oracle11g 体系结构

一：Oracle11g 体系结构

二：逻辑储存结构

二、1：数据块（data blocks）

  1 ----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

二、2：数据区 extent

二、3：段  segment

二、4：表空间  tablespace

二、5： SYSTEM 表空间

  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

二、6：SYSAUX 表空间

二、7：UODO 表空间

二、8：USERS 表空间

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