oracle11g的体系结构有几种,Oracle11g 体系结构
Oracle11g 體系結構
一:Oracle11g 體系結構
二:邏輯儲存結構
二、1:數據塊(data blocks)
1 ----通過 v$parameter數據字典來查詢oracle標準數據塊的大小。
2 [email?protected]> startup
3 ORACLE instance started.
4
5 Total System Global Area 1221992448 bytes
6 Fixed Size 1344596 bytes
7 Variable Size 771754924 bytes
8 Database Buffers 436207616 bytes
9 Redo Buffers 12685312 bytes
10 Database mounted.
11 Database opened.
12 [email?protected]> col name format a30;
13 [email?protected]> col value format a20;
14 [email?protected]> select name,value from v$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
二、2:數據區 extent
二、3:段? segment
二、4:表空間? tablespace
二、5: SYSTEM 表空間
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
二、6:SYSAUX 表空間
二、7:UODO 表空間
二、8:USERS 表空間
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總結
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