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Question on space utilization - VARCHAR — Vertica Forum

Question on space utilization - VARCHAR

nvk9nvk9
in General Discussion

If I have a column defined as VARCHAR(2000) and I insert a string

'WonderHowMuchSpaceThisTakes!!!' which has only 30 bytes, will Vertica consume the utilized 30 bytes or the all the allocated 2000?

Comments

  • Sharon_CutterSharon_Cutter ✭✭

    Vertica stores the 30 characters efficiently on disk in the projection, but you will pay a performance penalty at run-time if varchar columns are "over-declared".  The execution engine will use the full 2000 characters during query execution and will use extra storage for temp space operations.

     

      --Sharon

     

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