analyze index validate structure : Analyze « SQL Plus « Oracle PL / SQL






  1. Oracle PL / SQL
  2. SQL Plus
  3. Analyze

analyze index validate structure

  
SQL>
SQL>
SQL> set serveroutput on
SQL> set echo on
SQL> create table t ( x int, y int );

Table created.

SQL> create unique index t_idx on t(x,y);

Index created.

SQL> insert into t values ( 1, 1 );

1 row created.

SQL> insert into t values ( 1, NULL );

1 row created.

SQL> insert into t values ( NULL, 1 );

1 row created.

SQL> insert into t values ( NULL, NULL );

1 row created.

SQL> analyze index t_idx validate structure;

Index analyzed.

SQL> select name, lf_rows from index_stats;
NAME                    LF_ROWS
-------------------- ----------
T_IDX                         3

1 row selected.

SQL> insert into t values ( NULL, NULL );

1 row created.

SQL> insert into t values ( NULL, 1 );

SQL> insert into t values ( 1, NULL );


SQL> select x, y, count(*) from t group by x,y having count(*) > 1;
         X          Y   COUNT(*)
---------- ---------- ----------
                               2

1 row selected.

SQL>
SQL> drop table t;

Table dropped.

SQL> drop index t_idx;

SQL>
SQL> --








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