I have a simple SQL,
begin tran xxx; select top 50 * from aTable readpast for update; commit tran xxx;
And I ran from three threads (each thread starts own transaction). What I have observed is that sometimes two threads are returning the same set of records.
According to Sybase manual, "for update" should have locked the records that I have selected and readpast should have prevented me from reading locked records.
isolation level is 1.
select for update has been enabled sp_configure.
aTable is datarows locking
Any pointer is appreciated.