Home/ Questions/Q 7526313
In Process

The Archive Base Latest Questions

Editorial Team
  • 0
Asked: 2026-05-30T03:47:41+00:00

I have a big table that has many columns. In different use cases I

  • 0

I have a big table that has many columns. In different use cases I need to load different columns from this table, but usually I don’t need all of the columns. So now I think I should select the necessary columns from this big table.

For example I have a simple POJO like UseCase1 and I use this named query:

SELECT NEW UseCase1(t.a, t.b, t.c) FROM MyBigTable t

In update statements I also update only a, b, c fields.

So the question is, this is a good solution, to improve performance if I can’t change the table? And will this improve the performance? 🙂

Share

Leave an answer

You must login to add an answer.

Need An Account,

1 Answer

  1. Editorial Team

    We had similar situations, and you can see the performance improvement using this technique in 2 cases.

    1. If your table has more than 40-50 columns and you want only 5-10 values to be selected.
    2. If your Bean defines a non-Lazy collection mapping. Then avoiding this property in the constructor will be huge saving.(This one worked for us tremendously)

    Like @JB told, when we speak about performance nothing can be finalized without measuring it.These 2 point were my general experiences.

    • 0