Oracle教程之Oracle管理索引（七）--Oracle显示索引信息
1、显示当前用户索引信息（DBA_INDEXES,ALL_INDEXES,USER_INDEXES)
03:41:37 SQL> select index_name,index_type,uniqueness
03:41:49 2 from user_indexes;
INDEX_NAME INDEX_TYPE UNIQUENES
--------------- --------------- ---------
PK_EMP NORMAL UNIQUE
PK_DEPT NORMAL UNIQUE
R_EMPNO_IND NORMAL/REV NONUNIQUE
EMPNO_INDX NORMAL NONUNIQUE
INDX_ENAME FUNCTION-BASED NONUNIQUE
NORMAL
PK_SALE IOT - TOP UNIQUE
PK_DEPTNO NORMAL NONUNIQUE
7 rows selected.
2、显示索引列
03:44:27 SQL> col column_name for a15
03:44:43 SQL> r
1 select column_name,column_position,column_length
2* from user_ind_columns
COLUMN_NAME COLUMN_POSITION COLUMN_LENGTH
--------------- --------------- -------------
DEPTNO 1 22
ID 1 22
EMPNO 1 22
ENAME 1 10
SYS_NC00008$ 1 10
DEPTNO 1 22
EMPNO 1 22
ENAME 1 10
8 rows selected.
3、显示索引段的位置和尺寸
03:46:13 SQL> select tablespace_name,segment_type,bytes
03:46:22 2 from user_segments;
TABLESPACE_NAME SEGMENT_TYPE BYTES
--------------- --------------- ----------
USERS INDEX 65536
USERS INDEX 65536
USERS INDEX 65536
USERS TABLE 65536
USERS TABLE 65536
USERS INDEX 65536
USERS TABLE 65536
USERS CLUSTER 65536
USERS TABLE 65536
USERS TABLE 65536
USERS TABLE 65536
USERS INDEX 65536
USERS TABLE 65536
USERS INDEX 65536
USERS TABLE 65536
USERS01 INDEX 131072
USERS01 TABLE 131072
TABLESPACE_NAME SEGMENT_TYPE BYTES
--------------- --------------- ----------
USERS02 TABLE 65536
18 rows selected.
4、显示函数索引
03:47:39 SQL> select column_expression from user_ind_expressions;
COLUMN_EXPRESSION
--------------------------------------------------------------------------------
LOWER("ENAME")
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