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blocking remove


blocking remove

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riya_dave
riya_dave
Mr or Mrs. 500
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Group: General Forum Members
Points: 514 Visits: 367
hi

i am adding new column with default value
this table has millions of rows, so while i am executing my query ,its causing blocking to other user.

how to solve this

example

alter table emp
add column senti_v int default 0

thanks
SQLSACT
SQLSACT
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Group: General Forum Members
Points: 5060 Visits: 2969
Firstly, change the "add column" part to just "add".

Secondly, this kind of process will definitely take exclusive locks on the table which will block other processes.

I suggest that you run this process during a very quiet time or during a downtime period.

Regards
WolfgangE
WolfgangE
Ten Centuries
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Group: General Forum Members
Points: 1311 Visits: 798
You could add the column without a default value, that usually works quite quick.
Afterwards you could update the column in chunks of for example 1 Mio rows.
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