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Editorial Team
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Asked: 2026-05-16T23:50:31+00:00

In my Db initially i have one table with three columns and no data

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In my Db initially i have one table with three columns and no data at that time the MDf file size was 5122 KB.

Then i have inserted 500000 records in this table, MDF file size increased to 19456 KB

Then i have updated my table and made all the values of one column as Null but the file size is still same i.e 19456 KB.

Then i have deleted all the records from this table, but my MDF file size is still 19456 KB.

i wanted to know why the file size is not changing ?
Does a Null value in the column takes space ?

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1 Answer

  1. Editorial Team

    To reclaim the space you need to shrink the database as this is not done automatically for performance reasons.

    More information:

    Does a Null value in the column takes space ?

    • For a variable width column the NULL value takes no storage space.
    • For a fixed width column the NULL value requires the same storage space as any other value.
    • In addition making a column nullable can in some cases add an overhead per row for storing the nullable bitmap.
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