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execution time. Similarly to get MAX/MIN values: SELECT MAX(m ... ); query.setResult ("min(this.Id), max(this.Id), count(this.Id)"); Object[] results = (Object[])query

use the "generation one" garbage collection option and explicitly set the min and max heap sizes

>' but that doesn't change the issue (of course there are less entities because I testet only for 15 min).

>This is happening if multiple thread(20-50) accessing db parallelly for 30-40 min.  

settings to control the connection pool (min/max connections, etc...). Thanks,

calculations (count, sum, avg, max, min) that are carried out on all the objects (or the object tuples

> thamal Tomas Hamal I forgot to attach the heap dumps: idle2_4_min  - Server

with 'min': System.out.println("min not null: " + em.createQuery("SELECT min(p.bar) FROM Foo p WHERE p.bar >= 0 or p.bar <= 0").getSingleResult());

of an entity ViewConfiguration: private int widthPxSideBarLeft = 250;     @Min ... ="min-width:#{viewConfigurationManager.viewConfiguration.widthPxSideBarLeft}px"

get out of memory exceptions The test fails faster (in about 2 mins) if I enable another 5