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Function-based indexes are easy to use and implement, and they provide immediate value. They can be used to speed up existing applications without changing any of their logic or queries. Many orders of magnitude improvement may be observed. You can use them to precompute complex values without using a trigger. Additionally, the optimizer can estimate selectivity more accurately if the expressions are materialized in a function-based index. You can use function-based indexes to selectively index only rows of interest as demonstrated earlier with the PROCESSED_FLAG example. You can, in effect, index a WHERE clause using that technique. Lastly, you can use function-based indexes to implement a certain kind of integrity constraint: selective uniqueness (e.g., The fields X, Y, and Z must be unique when some condition is true ). Function-based indexes will affect the performance of inserts and updates. Whether or not that warning is relevant to you is something you must decide. If you insert and very infrequently query the data, this might not be an appropriate feature for you. On the other hand, keep in mind that you typically insert a row once and you query it thousands of times. The performance hit on the insert (which your individual end user will probably never notice) may be offset many thousands of times by speeding up the queries. In general, the pros heavily outweigh any of the cons in this case.

Application domain indexes are what Oracle calls extensible indexing They allow you to create your own index structures that work just like indexes supplied by Oracle When someone issues a CREATE INDEX statement using your index type, Oracle will run your code to generate the index If someone analyzes the index to compute statistics on it, Oracle will execute your code to generate statistics in whatever format you care to store them in When Oracle parses a query and develops a query plan that may make use of your index, Oracle will ask you how costly this function is to perform as it is evaluating the different plans In short, application domain indexes give you the ability to implement a new index type that does not exist in the database as of yet.

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The (abbreviated) program is implemented as follows. As with the authorizer function, I will break it into pieces. The first part of the program connects to the database and registers the authorization function: int main(int argc, char **argv) { sqlite3 *db, *db2; char *zErr, *sql; int rc; /** Setup */

For example, if you develop software that analyzes images stored in the database, and you produce information about the images, such as the colors found in them, you could create your own image index As images are added to the database, your code is invoked to extract the colors from the images and store them somewhere (wherever you want to store them) At query time, when the user asks for all blue images, Oracle will ask you to provide the answer from your index when appropriate The best example of an application domain index is Oracle s own text index This index is used to provide keyword searching on large text items You may create a simple text index like this ops$tkyte@ORA11GR2> create index myindex on mytable(docs) 2 indextype is ctxsyscontext 3 / Index created.

You can use conditional formatting to add visual impact to the data in a pivot table, just as with other cells in the workbook. To quickly format the cells in a pivot table, you can use one of the built-in color scales. Follow these instructions to add a conditional formatting color scale to a pivot table with a single block of cells to format.

and then use the text operators the creators of that index type introduced into the SQL language select * from mytable where contains( docs, 'some words' ) > 0; It will even respond to commands such as the following: ops$tkyte@ORA11GR2> begin 2 dbms_statsgather_index_stats( user, 'MYINDEX' ); 3 end; 4 / PL/SQL procedure successfully completed It will participate with the optimizer at runtime to determine the relative cost of using a text index over some other index or a full scan The interesting thing about all of this is that you or I could have developed this index The implementation of the text index was done without inside kernel knowledge It was done using the dedicated, documented, and exposed API The Oracle database kernel is not aware of how the text index is stored (the APIs store it in many physical database tables per index created).

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