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If you satisfy all three criteria, feel free to skip the index it is not needed and will slow down DML on the child table. If you do any of the three, be aware of the consequences. As a side note, if you believe that a child table is getting locked via an unindexed foreign key and you would like to prove it (or just prevent it in general), you can issue the following: ALTER TABLE <child table name> DISABLE TABLE LOCK; Now, any UPDATE or DELETE to the parent table that would cause the table lock will receive the following: ERROR at line 1: ORA-00069: cannot acquire lock -- table locks disabled for <child table name> This is useful in tracking down the piece of code that is doing what you believe should not be done (no UPDATEs or DELETEs of the parent primary key), as the end users will immediately report this error back to you.

SQLITE_SCHEMA conditions. If you know you don t need any changes to your database schema in your application, you can simply install an authorizer function to deny any operations that attempt to modify the schema in certain ways.

There are many possible causes of this. In this section, we ll take a look at some of the most common.

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We re using a B*Tree index, and our predicate does not use the leading edge of an index In this case, we might have a table T with an index on T(x,y) We query SELECT * FROM T WHERE Y = 5 The optimizer will tend not to use the index since our predicate did not involve the column X it might have to inspect each and every index entry in this case (we ll discuss an index skip scan shortly where this is not true) It will typically opt for a full table scan of T instead That does not preclude the index from being used.

In a three-color scale, the cells with the lowest, median, and highest values are a solid color, and cells with values in between have a graduated color. In the Green-Yellow-Red color scale, the cell with the highest value is solid green, the cell with the median value is solid yellow, and the cell with the lowest value is solid red. Two-color scales, which use one color for the cell with the highest number, and a second color for the cell with the lowest number, are also available. Cells with values between the highest and lowest are shaded in a graduated color scale.

If the query was SELECT X,Y FROM T WHERE Y = 5, the optimizer would notice that it did not have to go to the table to get either X or Y (they are in the index) and may very well opt for a fast full scan of the index itself, as the index is typically much smaller than the underlying table Note also that this access path is only available with the CBO Another case whereby the index on T(x,y) could be used with the CBO is during an index skip scan The skip scan works well if and only if the leading edge of the index (X in the previous example) has very few distinct values and the optimizer understands that For example, consider an index on (GENDER, EMPNO) where GENDER has the values M and F, and EMPNO is unique.

Caution Keep in mind that denying schema changes in an authorizer is by no means a cure-all for SQLITE_SCHEMA events. You need to be careful about all the implications of denying various changes to the schema. Just blindly blocking all events resulting in a schema change can restrict other seemingly legitimate operations such as VACUUM.

A query such as select * from t where empno = 5; might consider using that index on T to satisfy the query in a skip scan method, meaning the query will be processed conceptually like this select * from t where GENDER='M' and empno = 5 UNION ALL select * from t where GENDER='F' and empno = 5; It will skip throughout the index, pretending it is two indexes: one for Ms and one for Fs We can see this in a query plan easily We ll set up a table with a bivalued column and index it: ops$tkyte@ORA11GR2> create table t 2 as 3 select decode(mod(rownum,2), 0, 'M', 'F' ) gender, all_objects* 4 from all_objects 5 / Table created ops$tkyte@ORA11GR2> create index t_idx on t(gender,object_id) 2 / Index created ops$tkyte@ORA11GR2> begin 2 dbms_statsgather_table_stats 3 ( user, 'T' ); 4 end; 5 / PL/SQL procedure successfully completed..

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