Hi all. I have set up a broker(v5.5.0) with the jdbc store of mysql cluster v7.1.18. After the cluster of mysql has been launched, I test it's performance via a simple jdbc code with inserting as many records as possible. It workes well because I can insert 4,000+ records(size of record is 1kb) every seconds. But my jms test programe sending as many messges as possible to broker always suspends for a while for several mintues. Do not know what's wrong and does anyone get into this trouble too? SuoNayi