Question

I have the following code in a stored procedure.

....
select ... into #temp from ....
alter table #temp add constraint PK_mytemp13 primary key (....)
....

And I will get the following error message from time to time if the stored procedure is run in parallel.

There is already an object named ‘PK_perf322dsf’ in the database.
Could not create constraint. See previous errors.

I think it can be avoid by the following approaches. Is there any other more elegant solution?

1. Create a temp table with primary key first. Then insert the rows.
   create table #temp (... primary key (....))

2. Create PK dynamically with session id dynamically.
   declare @s varchar(500) = 'alter table #temp add constraint PK_temp' + @@spid + ' primary key (....)

Answer 1

1. you try to insert to the same temporary table from different connections (which is impossible, instead of global temp tables),
2. or you try to insert into different tables.

if 2nd – you simply may do the following – ALTER TABLE #temp ADD PRIMARY KEY(…)

if 1st – you have to create the table (regular or global temporary) with key prior to use it in parallel operations