Well, that is a very open-ended question so I will give a very high-level answer. Here are some times when it might...
By submitting your personal information, you agree that TechTarget and its partners may contact you regarding relevant content, products and special offers.
makes sense to have no indexes defined on a DB2 table:
- When all accesses retrieve every row of the table. Because every row will be retrieved every time you want to use the table an index (if used) would just add extra I/O and would decrease, not enhance performance.
- For a very small table with only a few pages of data and no primary/unique key requirements. A very small table (I'd say a maximum of 10 pages) might not need an index because simply reading all of the pages is very efficient already.
- When performance doesn't matter and the table is only accessed very infrequently.
Dig Deeper on IBM DB2 management
Related Q&A from Craig S. Mullins
Our expert suggests that the best way to pass the SAP BW exam is to have hands-on job experience. But that's not all he has to say about ...continue reading
To export data from a DB2 table to a flat file, you need to run an export specifying the proper file format. The export utility exports data from a ...continue reading
Craig Mullins recommends two specific resources for learning how to create and support Binary Large Objects (BLOB) in DB2.continue reading
Have a question for an expert?
Please add a title for your question
Get answers from a TechTarget expert on whatever's puzzling you.