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Asked: 2026-05-13T20:10:12+00:00

I have a Tablespace with total Size 600 MB(this is my test machine), and

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I have a Tablespace with total Size 600 MB(this is my test machine), and free space of 110 MB. I was trying to compress a table that’s size is 120 MB. When execute the commands:

alter table DOWNLOADSESSIONLOG move compress;

I’m getting error saying:

(Error): ORA-01659: unable to allocate MINEXTENTS beyond 16 in tablespace WAP.

I was searching and all are saying to increase the Tablespace, but I wanted to know how much space I need to give, because I don’t want to gave some 200 /300 MB extra space. I wanted to test this in my Test Machine and wanted to implement on Live system that have 60 GB tablespace with one 47 GB table. I wanted to compress 47 GB table on live system, before that I wanted to test it in test environment. Is there any calculation how much space we need to give; otherwise on live system I need to give Lots of space unnecessarily and its difficult.

Appreciate somebody can give some ideas.

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1 Answer

  1. Editorial Team

    I would create a new throw-away tablespace in your test environment that has the same characteristics as your target tablespace in the production environment and then move/compress your table into that. This will give you the best estimate of how much additional space will be necessary. You can move the table back to the original tablespace and drop the new tablespace once you have this number.

    Remember that you’ll need at least (original size) + (compressed size) available in the tablespace for the duration of the move.

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