index
2015-08-19 23:14
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--创建语法:
Create [ Unique | Bitmap ] Index [Schema.]index_name On [Schema.]table_name(column_name1 Asc | Desc,...,columne_nameN Asc|Desc )
[Tablespace tablespace_name]
[Reverse]
SQL> Create Table 学生表(Id Number,年级 Varchar2(4),学号 Varchar2(4),姓名 Varchar2(6),性别 Varchar2(2),年龄 Varchar2(2));
Table created
SQL> Create Unique Index ind_学生表_id On 学生表(Id Asc) Tablespace Users Reverse;
Index created
SQL> Create Unique Index ind_学生表_年级_学号 On 学生表(年级 Asc,学号 Asc) Tablespace Users;
Index created
SQL> Create Index ind_学生_姓名 On 学生表(Upper(姓名) Asc) ;
Index created
SQL> Create Bitmap Index ind_func_性别 On 学生表(性别 Asc);
Index created
SQL> Select a.index_name,a.index_type,a.table_name,a.uniqueness,a.tablespace_name From dba_indexes a Where a.table_name='学生表' ;
INDEX_NAME INDEX_TYPE TABLE_NAME UNIQUENESS TABLESPACE_NAME
------------------------------ --------------------------- ------------------------------ ---------- ------------------------------
IND_学生表_ID NORMAL/REV 学生表 UNIQUE USERS
IND_学生表_年级_学号 NORMAL 学生表 UNIQUE USERS
IND_学生_姓名 FUNCTION-BASED NORMAL 学生表 NONUNIQUE ZL9BASEITEM
IND_FUNC_性别 BITMAP 学生表 NONUNIQUE ZL9BASEITEM
SQL> Select a.INDEX_NAME,a.COLUMN_NAME From dba_ind_columns a Where a.table_name='学生表' ;
INDEX_NAME COLUMN_NAME
------------------------------ --------------------------------------------------------------------------------
IND_学生表_ID ID
IND_学生表_年级_学号 年级
IND_学生表_年级_学号 学号
IND_学生_姓名 SYS_NC00007$
IND_FUNC_性别 性别
SQL> Create Table t(Id Number);
Table created
SQL> Create Index ind_t_id On t(Id);
Index created
SQL>
SQL> Declare
2 i Number;
3 Begin
4 For i In 1..2000000 Loop
5 Insert Into t Values(i);
6 If Mod(i,10000)=0 Then
7 Commit;
8 End If;
9 End Loop;
10 End;
11 /
PL/SQL procedure successfully completed
SQL> Select a.name,a.pct_used From Index_Stats a;
NAME PCT_USED
------------------------------ ----------
SQL> analyze index ind_t_id validate structure;
Index analyzed
SQL> Select a.name,a.pct_used From Index_Stats a;
NAME PCT_USED
------------------------------ ----------
IND_T_ID 100
SQL> delete t where rownum<=1300000;
1300000 rows deleted
SQL> commit;
Commit complete
SQL> analyze index ind_t_id validate structure;
Index analyzed
SQL> Select a.name,a.pct_used From Index_Stats a;
NAME PCT_USED
------------------------------ ----------
IND_T_ID 70
SQL> alter index ind_t_id rebuild;
Index altered
SQL> Select a.name,a.pct_used From Index_Stats a;
NAME PCT_USED
------------------------------ ----------
SQL> analyze index ind_t_id validate structure;
Index analyzed
SQL> Select a.name,a.pct_used From Index_Stats a;
NAME PCT_USED
------------------------------ ----------
IND_T_ID 90
SQL> Alter Index ind_t_id Rebuild Online;
Index altered
SQL> drop index ind_t_id;
Index dropped
SQL>
Create [ Unique | Bitmap ] Index [Schema.]index_name On [Schema.]table_name(column_name1 Asc | Desc,...,columne_nameN Asc|Desc )
[Tablespace tablespace_name]
[Reverse]
SQL> Create Table 学生表(Id Number,年级 Varchar2(4),学号 Varchar2(4),姓名 Varchar2(6),性别 Varchar2(2),年龄 Varchar2(2));
Table created
SQL> Create Unique Index ind_学生表_id On 学生表(Id Asc) Tablespace Users Reverse;
Index created
SQL> Create Unique Index ind_学生表_年级_学号 On 学生表(年级 Asc,学号 Asc) Tablespace Users;
Index created
SQL> Create Index ind_学生_姓名 On 学生表(Upper(姓名) Asc) ;
Index created
SQL> Create Bitmap Index ind_func_性别 On 学生表(性别 Asc);
Index created
SQL> Select a.index_name,a.index_type,a.table_name,a.uniqueness,a.tablespace_name From dba_indexes a Where a.table_name='学生表' ;
INDEX_NAME INDEX_TYPE TABLE_NAME UNIQUENESS TABLESPACE_NAME
------------------------------ --------------------------- ------------------------------ ---------- ------------------------------
IND_学生表_ID NORMAL/REV 学生表 UNIQUE USERS
IND_学生表_年级_学号 NORMAL 学生表 UNIQUE USERS
IND_学生_姓名 FUNCTION-BASED NORMAL 学生表 NONUNIQUE ZL9BASEITEM
IND_FUNC_性别 BITMAP 学生表 NONUNIQUE ZL9BASEITEM
SQL> Select a.INDEX_NAME,a.COLUMN_NAME From dba_ind_columns a Where a.table_name='学生表' ;
INDEX_NAME COLUMN_NAME
------------------------------ --------------------------------------------------------------------------------
IND_学生表_ID ID
IND_学生表_年级_学号 年级
IND_学生表_年级_学号 学号
IND_学生_姓名 SYS_NC00007$
IND_FUNC_性别 性别
SQL> Create Table t(Id Number);
Table created
SQL> Create Index ind_t_id On t(Id);
Index created
SQL>
SQL> Declare
2 i Number;
3 Begin
4 For i In 1..2000000 Loop
5 Insert Into t Values(i);
6 If Mod(i,10000)=0 Then
7 Commit;
8 End If;
9 End Loop;
10 End;
11 /
PL/SQL procedure successfully completed
SQL> Select a.name,a.pct_used From Index_Stats a;
NAME PCT_USED
------------------------------ ----------
SQL> analyze index ind_t_id validate structure;
Index analyzed
SQL> Select a.name,a.pct_used From Index_Stats a;
NAME PCT_USED
------------------------------ ----------
IND_T_ID 100
SQL> delete t where rownum<=1300000;
1300000 rows deleted
SQL> commit;
Commit complete
SQL> analyze index ind_t_id validate structure;
Index analyzed
SQL> Select a.name,a.pct_used From Index_Stats a;
NAME PCT_USED
------------------------------ ----------
IND_T_ID 70
SQL> alter index ind_t_id rebuild;
Index altered
SQL> Select a.name,a.pct_used From Index_Stats a;
NAME PCT_USED
------------------------------ ----------
SQL> analyze index ind_t_id validate structure;
Index analyzed
SQL> Select a.name,a.pct_used From Index_Stats a;
NAME PCT_USED
------------------------------ ----------
IND_T_ID 90
SQL> Alter Index ind_t_id Rebuild Online;
Index altered
SQL> drop index ind_t_id;
Index dropped
SQL>
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