By Darl Kuhn
Professional Indexing in Oracle Database 11g is set the single database constitution on the center of just about all functionality issues: the index. Database process functionality is likely one of the best issues in info know-how this present day. directors fight to maintain with the explosion of entry and job pushed by way of the proliferation of computing into every little thing from telephones to drugs to desktops in our more and more attached global. on the center of any good-performing database lies a legitimate indexing procedure that makes applicable use of indexing, and particularly of the vendor-specific indexing beneficial properties on provide.
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Extra resources for Expert Indexing in Oracle Database 11g: Maximum Performance for Your Database
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.
Prior to dropping an index, we recommend that you generate the data definition language (DDL) that would be required to re-create the index. This allows you to re-create the index (as it was before it was dropped) in the event that dropping the index has a detrimental impact on performance and needs to be re-created. GET_DDL function to display an object’s DDL. Make sure you set the LONG variable to an appropriate value so that the returned CLOB value is displayed in its entirety. info CHAPTER 2 ■ B-TREE INDEXES BUFFER_POOL DEFAULT FLASH_CACHE DEFAULT CELL_FLASH_CACHE DEFAULT) TABLESPACE "REPORTING_INDEX" This code shows all of the aspects of the index that would be required to re-create it.
This isn’t a hard-and-fast rule, but rather a guideline to help with maintenance and manageability. B-tree indexes are closely associated with primary key and unique key constraints. Oracle will automatically create a B-tree index for you when the primary key or unique key constraint is created. When an index is automatically created with the constraint, the index is also automatically dropped when you drop or disable the constraint. You have the option of creating the index and constraint separately if you are required to manage these two objects separately.