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Editorial Team
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Asked: 2026-05-26T16:24:10+00:00

I have a existing query in the system which is a simple select query

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I have a existing query in the system which is a simple select query as follows:

SELECT <COLUMN_X>, <COLUMN_Y>, <COLUMN_Z> FROM TABLE <WHATEVER>

Over time, <WHATEVER> is growing in terms of records. Is there any way possible to improve the performance here? The developer is using Statement interface. I believe PreparedStatement won’t help here since the query is executed only once.

Is there any thing else that can be done? One of the columns is a primary key and others are VARCHAR (if the information helps)

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1 Answer

  1. Editorial Team

    Does you query have any predicates? Or are you always returning all of the rows from the table?

    If you are always returning all the rows, a covering index on column_x, column_y, column_z would allow Oracle to merely scan the index rather than doing a table scan. The query will still slow down over time but the index should grow more slowly than the table.

    If you are returning a subset of rows, there are potentially other indexes that would be more advantageous from a performance perspective.

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