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In addition to transparently helping out queries that use built-in functions like UPPER, LOWER, and so on, function-based indexes can be used to selectively index only some of the rows in a table As we ll discuss a little later, B*Tree indexes do not contain entries for entirely NULL keys That is, if you have an index I on a table T Create index I on t(a,b); and you have a row where A and B are both NULL, there will be no entry in the index structure This comes in handy when you are indexing just some of the rows in a table Consider a large table with a NOT NULL column called PROCESSED_FLAG that may take one of two values, Y or N, with a default value of N.

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By default, error values are displayed in a pivot table. You can hide the errors by changing the PivotTable Options, so blank cells appear instead of the errors: 1. Right-click a cell in the pivot table, and in the context menu, click PivotTable Options. 2. In the PivotTable Options dialog box, click the Layout & Format tab. 3. In the Format section, add a check mark to For Error Values Show (see Figure 4-9).

New rows are added with a value of N to signify not processed, and as they are processed, they are updated to Y to signify processed We would like to index this column to be able to retrieve the N records rapidly, but there are millions of rows and almost all of them are going to have a value of Y The resulting B*Tree index will be large, and the cost of maintaining it as we update from N to Y will be high This table sounds like a candidate for a bitmap index (this is low cardinality, after all!), but this is a transactional system and lots of people will be inserting records at the same time with the processed column set to N and, as we discussed earlier, bitmaps are not good for concurrent modifications.

When we factor in the constant updating of N to Y in this table as well, then bitmaps would be out of the question, as this process would serialize entirely So, what we would really like is to index only the records of interest (the N records) We ll see how to do this with function-based indexes, but before we do, let s see what happens if we just use a regular index Using the standard BIG_TABLE script described in the setup section, we ll update the TEMPORARY column, flipping the Ys to Ns and the Ns to Ys ops$tkyte@ORA11GR2> update big_table set temporary = decode(temporary,'N','Y','N'); 1000000 rows updated and we ll check out the ratio of Ys to Ns ops$tkyte@ORA11GR2> select temporary, cnt, 2 round( (ratio_to_report(cnt) over ()) * 100, 2 ) rtr 3 from (.

To illustrate this, the following example (the complete source of which is in authorizer.c) will create a table foo, defined as follows: create table foo(x int, y int, z int) It registers an authorizer function, which will do the following: Block reads of column z Block updates to column x Monitor ATTACH and DETACH database events Log database events as they happen

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Figure 4-9. Format option for error values 4. Leave the text box blank, and the errors will be replaced with blank cells, and then click OK to close the dialog box. If you prefer, you could type other characters, such as a hyphen, in the text box, and the error values will be replaced by that character.

select temporary, count(*) cnt from big_table group by temporary ) /

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