probelm with alter table add constraint......

 

I have an issue with the add foreign key constraint which goes for waiting and locks other queries as well.

 

ALTER TABLE ONLY holding_positions ADD CONSTRAINT holding_positions_stock_id_fkey FOREIGN KEY (stock_id)
      REFERENCES stocks (stock_id) MATCH SIMPLE
      ON UPDATE NO ACTION ON DELETE NO ACTION;

 

The holding_positions table has no data in it as yet.

 

 

ps aux | grep postgres

postgres  5855  0.8  1.6 346436 271452 ?     Ss   16:34   0:07 postgres: abc stocks 192.100.100.111(60308) SELECT waiting