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Editorial Team
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Asked: 2026-06-04T09:17:47+00:00

I have a simple sql call like :- select col1,col2 from table1 and sometimes

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I have a simple sql call like :-

select col1,col2 from table1

and sometimes the system runs the following:-

update table1 
set col3 = 'something' 
where col1 ='s1' and col2 ='s2'

These queries are ran through various applications running on our server and it only happens on one table which has something like 100k rows.

I have tables with millions of rows – it doesn’t timeout on them but not sure why it does on this one.

These queries run all day long without any problems but sometimes during the day – specially during peak times – they fail with error – timeout expired –

Can you please tell me what things can I try to resolve this error

Do I need to perform some type of locking ?

Also is it true that if a user is updating a comment and then other user on the system tries to update the same row in the table – will it timeout the 2nd user because the row is locked for editing – is there a way around that?

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1 Answer

  1. Editorial Team

    I have found the answer –
    Because it was a table in the old system – the previous users didn’t add a primary key thinking that there is already a virtual primary key in there but it wasn’t right.

    As the sql would take too long for editing and would timeout.

    So I just made a composite key in the table and now it is working alright.

    Conclusion – Never have a table without a primary key if you are going to be dealing with updating,deleting data

    Thanks everyone for your comments

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