Database Administrator Guide > Database Administrator Guide > Choosing Storage Structures and Secondary Indexes > B-tree Storage Structure > B-tree Troubleshooting
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B-tree Troubleshooting
The following are problems encountered with the B-tree storage structure, and their solutions:
Problem
Solution
You tried to use pattern matching, but did not specify the leftmost character.
Specify the leftmost part of the key; *F* does not use the B-tree index, but F* does. If you cannot modify the search condition, the entire table must be scanned.
You tried to use just part of a multi-column key, but did not specify the leftmost column.
Specify the leftmost column of the multi-column key. If you cannot modify the search condition, create a secondary index with only the columns on which you are searching.
You are deleting frequently, as well as adding data.
To reclaim space, periodically select Shrink B-tree Index in the Modify Table Structure dialog, or use the MODIFY TO MERGE or MODIFY statements.
Last modified date: 04/03/2024