Hi, I am trying to use monetdb with Hikari Pool. I have set the connection timeout to 4500. I have 4 max connections. The query execution takes at the max 20 ms. I am testing with 250 threads and 100000 requests. But I get a connection time out as follows : 11 09:40:24 PST.DEBUG118*HikariPool~logPoolState@339: Timeout failure pool HikariPool-0 stats (total=4, active=3, idle=1, waiting=1) The waiting number increases to a large number as 139. The idle drops to 0 in just 4 such messages. My Hikari pool configuration is as follows _dataSource = new HikariDataSource(); _dataSource.setDriverClassName("nl.cwi.monetdb.jdbc.MonetDriver"); _dataSource.setJdbcUrl("jdbc:monetdb://" + _reg.getStrProp("tdbUrl")); _dataSource.setUsername(_reg.getStrProp("tdbUsr")); _dataSource.setPassword(_reg.getStrProp("tdbPswd")); _dataSource.setMaximumPoolSize(4); _dataSource.setConnectionTimeout(4500); _dataSource.addDataSourceProperty("cachePrepStmts", "true"); _dataSource.addDataSourceProperty("prepStmtCacheSize", "250"); _dataSource.addDataSourceProperty("prepStmtCacheSqlLimit", "2048"); Do I need to change the configuration ? Or am I supposed to change the pool ? Which is the pool that is used with monetdb JDBC driver ? Regards, Poornima.