By D. Kuhn, et. al.,
Specialist Indexing in Oracle Database 11g is set the single database constitution on the center of just about all functionality issues: the index. Database approach functionality is among the most sensible matters in details expertise at the present time. directors fight to take care of with the explosion of entry and job pushed by means of the proliferation of computing into every thing from telephones to pills to desktops in our more and more attached international. on the middle of any good-performing database lies a valid indexing approach that makes applicable use of indexing, and particularly of the vendor-specific indexing positive aspects on offer.
Few databases totally take advantage of the wealth of information entry mechanisms supplied by means of Oracle. professional Indexing in Oracle Database 11g is helping by way of bringing jointly info indexing and the way to take advantage of it into one, handy and blissfully brief quantity that you should learn speedy and feature at your fingertips for reference. study the differing kinds of indices to be had and whilst each one is better utilized. realize while queries aren’t utilizing indices as you plan. deal with your indexing for max functionality. allow professional Indexing in Oracle Database 11g be your advisor to deep mastery of the main basic functionality optimization constitution in Oracle Database.
Explains how indices paintings, how they assist, and the way they hinder
Demystifies a number of the index choices
Describes the database management chores linked to indices
What you’ll learn
Create an total indexing technique to consultant your decisions
Choose the proper indexing mechanisms on your applications
Manage and hold indices to prevent degradation and shield efficiency
Take greater good thing about underused index kinds reminiscent of index-organized tables
Choose the best columns to index, with confidence
Blend partitioning and materialized perspectives into your indexing process
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Extra info for Expert Indexing in Oracle DB 11g - Max. Perf. for Your DB
You can’t have an enabled primary key or unique key constraint without an associated B-tree index. When you create a primary key or unique key constraint, you have the option of having Oracle automatically create the corresponding index. In this scenario, if you drop or disable the constraint, Oracle will also automatically drop the corresponding index. You can also create the index separately from the constraint. When you create the index and constraint separately, this allows you to drop or disable the constraint without automatically dropping the corresponding index.
When you create the index and constraint separately, this allows you to drop or disable the constraint without automatically dropping the corresponding index. If you work with big data, you may want the flexibility of disabling a constraint without dropping the corresponding index. Oracle doesn’t automatically create an index when a foreign key constraint is defined, so you must manually create an index on columns associated with a foreign key constraint. In most scenarios it’s beneficial to create a B-tree index on foreign key columns because it helps prevent locking issues and assists with performance of queries that join parent/child tables via the primary key and foreign key columns.
Therefore, you must manually create a foreign key index based on the columns defined as the foreign key constraint. In most scenarios, you should create indexes on columns associated with a foreign key. Here are two good reasons: • Oracle can often make use of an index on foreign key columns to improve the performance of queries that join a parent table and child table (using the foreign key columns). • If no B-tree index exists on the foreign key columns, when you insert or delete from a child table, it locks all rows in the parent table.