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Row locking using oracle database

 
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I have a problem on record locking using JDBC. My application have a JTable to show the records of the table in Oracle DB. User can select the row in the table and the form is shown to display the detail of the record. Before the form is display, I am using the statement SELECT * FROM TABLE_NAME WHERE ID = ? FOR UPDATE NOWAIT to lock the record. The problem is when one user lock the record, another user also cannot lock other record. It seen that the whole table is locked by the first user. Why ? In my knownledg, the select for update statement only lock the selected record. Other rows can be update by other people.
Have any suggestion? Thanks
 
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