Every day from 23.00 to 01.00 the performance of the database becomes slow, when i traced i found the following "The SQL statement with SQL_ID "4pgt142s271gy" was blocked on row locks.", which i think is the reason for poor performance and also i found the query with this SQL_ID.
Dut to this my Application at this time Hangs.
What should be my next step,i can't change this query because till last week the database was going fine.
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row locks means you have more than one session modifying same set of rows so if one modifies row 1 and the other tries to modify the same row it will have to wait until the first completes his transaction