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Connection Pool (DataSource) is slow
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created by <a href="http://community.jboss.org/people/vlc">vlc vlc</a> in <i>Datasource Configuration</i> - <a href="http://community.jboss.org/message/626762#626762">View the full discussion</a>
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<div class="jive-rendered-content"><p>Hi Community,</p><p style="min-height: 8pt; height: 8pt; padding: 0px;"> </p><p>I am using the following MySQL DataSource XML:</p><p style="min-height: 8pt; height: 8pt; padding: 0px;"> </p><table><tbody><tr><td style=";"></td><td style=";"><jndi-name>MySQLDB</jndi-name></td></tr><tr><td style=";"></td><td style=";"><xa-datasource-property name="URL">jdbc:mysql://127.0.0.1:3306/db</xa-datasource-property></td></tr><tr><td style=";"></td><td style=";"><xa-datasource-class>com.mysql.jdbc.jdbc2.optional.MysqlXADataSource</xa-datasource-class></td></tr><tr><td style=";"></td><td style=";"><user-name>username</user-name></td></tr><tr><td style=";"></td><td style=";"><password>password</password></td></tr><tr><td style=";"></td><td style=";"><!-- <track-connection-by-tx>true</track-connection-by-tx> --></td></tr><tr><td style=";"></td><td style=";"><exception-sorter-class-name>org.jboss.resource.adapter.jdbc.vendor.MySQLExceptionSorter</exception-sorter-class-name></td></tr><tr><td style=";"></td><td style=";"><valid-connection-checker-class-name>org.jboss.resource.adapter.jdbc.vendor.MySQLValidConnectionChecker</valid-connection-checker-class-name></td></tr><tr><td style=";"></td><td style=";"><min-pool-size>10</min-pool-size></td></tr><tr><td style=";"></td><td style=";"><max-pool-size>100</max-pool-size></td></tr><tr><td style=";"></td><td style=";"><idle-timeout-minutes>15</idle-timeout-minutes></td></tr><tr><td style=";"></td><td style=";"><blocking-timeout-millis>500</blocking-timeout-millis></td></tr><tr><td style=";"></td><td style=";"><track-statements>true</track-statements></td></tr></tbody></table><p style="min-height: 8pt; height: 8pt; padding: 0px;"> </p><p>I am doing something like this: </p><p>0. create at application startup DataSource (InitialContext, lookup()) </p><p>1. execute at each request java.sql.Connection = ds.getConnection();</p><p>2. do queries (PreparedStatement-s, ResultSet-s)</p><p>3. close PreparedStatement-s, ResultSet-s, Connection object</p><p style="min-height: 8pt; height: 8pt; padding: 0px;"> </p><p>TEST: I execute 100 or 1000 requests requiring connection to the Database.</p><p>The problem is DataSource.getConnection() takes very often 500 ms ~ 600 ms.</p><p>At every get connection a new WrappedConnection object is returned (but I expect to reuse some already created connections)</p><p>"show processlist" in MySQL show always 10 connections, jmx-console shows the pool is working with information like: created, in-use, destroyed connections.</p><p style="min-height: 8pt; height: 8pt; padding: 0px;"> </p><p style="min-height: 8pt; height: 8pt; padding: 0px;"> </p><p>Please give me some answars:</p><p>1. Why getConnection() function is so slow? </p><p>2. Why diferrent WrappedConnection objects are create at each getConnection() call?</p><p>3. The pool is between 10~100. Why does not exceed 10 connections even I execute 100 or 1000 parallel requests.</p><p style="min-height: 8pt; height: 8pt; padding: 0px;"> </p><p>Thank you for your interest. </p><p>Cristi, </p></div>
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