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ops$tkyte@ORA11GR2> insert into t values ( 1, 1 ); 1 row created. ops$tkyte@ORA11GR2> insert into t values ( NULL, 1 ); 1 row created. ops$tkyte@ORA11GR2> begin 2 dbms_stats.gather_table_stats(user,'T'); 3 end; 4 / PL/SQL procedure successfully completed. When we go to query that table this time, we ll discover this: ops$tkyte@ORA11GR2> set autotrace on ops$tkyte@ORA11GR2> select * from t where x is null; X Y ---------- ---------1 Execution Plan ---------------------------------------------------------0 SELECT STATEMENT Optimizer=ALL_ROWS (Cost=1 Card=1 Bytes=5) 1 0 INDEX (RANGE SCAN) OF 'T_IDX' (INDEX (UNIQUE)) (Cost=1 Card=1 Bytes=5) Previously, I said that you can use to your advantage the fact that totally Null entries are not stored in a B*Tree index here is how. Say you have a table with a column that takes exactly two values. The values are very skewed; say, 90 percent or more of the rows take on one value and 10 percent or less take on the other value. You can index this column efficiently to gain quick access to the minority rows. This comes in handy when you would like to use an index to get to the minority rows, but you want to full scan to get to the majority rows, and you want to conserve space. The solution is to use a Null for majority rows and whatever value you want for minority rows or, as demonstrated earlier, use a function-based index to index only the non-null return values from a function. Now that you know how a B*Tree will treat Null values, you can use that to your advantage and take precautions with unique constraints on sets of columns that all allow Nulls (be prepared to have more than one row that is all Null as a possibility in this case).

2. On the Ribbon, click the Home tab, and in the Styles group, click Conditional Formatting. 3. In the list of conditional formatting options, click Color Scales, and then click the first option Green-Yellow-Red Color Scale.

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The question of whether or not foreign keys should be indexed comes up frequently. We touched on this subject in 6 Locking and Latching when discussing deadlocks. There, I pointed out that unindexed foreign keys are the biggest single cause of deadlocks that I encounter, due to the fact that an update to a parent table s primary key or the removal of a parent record will place a table lock on the child table (no modifications to the child table will be allowed until the statement completes). This locks many more rows than it should and decreases concurrency. I see it frequently when people are using a tool that generates the SQL to modify a table. The tool generates an UPDATE statement that updates every column in the table, regardless of whether or not the value was modified. This, in effect, updates the primary key (even though they never changed the value). For example, Oracle Forms will do this by default, unless you tell it to just send modified columns over to the database. In addition to the table lock issue that might hit you, an unindexed foreign key is bad in the following cases as well:

The update should succeed, but the value in column x should be unchanged, because the authorizer denies it This is confirmed on the following select statement, which shows that all columns were updated except for column x, which is unchanged The program then drops the foo table, which should issue a schema change notification from the previous filter Step 5 tests the attach and detach database commands The thing to notice here is how the authorizer function is provided with the name of the database and that you can distinguish the operations being performed under the attached database as opposed to the main database..

When you have an ON DELETE CASCADE and have not indexed the child table. For example, EMP is child of DEPT. DELETE FROM DEPT WHERE DEPTNO = 10 should cascade to EMP. If DEPTNO in EMP is not indexed, you will get a full table scan of EMP. This full scan is probably undesirable, and if you delete many rows from the parent table, the child table will be scanned once for each parent row deleted. When you query from the parent to the child. Consider the EMP/DEPT example again. It is very common to query the EMP table in the context of a DEPTNO. If you frequently query

select * from dept, emp where emp.deptno = dept.deptno and dept.dname = :X; to generate a report or something, you ll find not having the index in place will slow down the queries. This is the same argument I gave for indexing the NESTED_COLUMN_ID of a nested table in 10. The hidden NESTED_COLUMN_ID of a nested table is nothing more than a foreign key. So, when do you not need to index a foreign key In general, when the following conditions are met: You do not delete from the parent table. You do not update the parent table s unique/primary key value, either purposely or by accident (via a tool). You do not join from the parent table to the child table, or more generally, the foreign key columns do not support an important access path to the child table and you do not use them in predicates to select data from this table (such as DEPT to EMP).

In the Color Scales menu, point to any of the color scale options to see a preview of the formatting on Tip

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