| --- |
| title: Timeouts for Long-Running Queries |
| --- |
| |
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| |
| <a id="topic_long-running-queries"></a> |
| |
| <%=vars.product_name%> can monitor and throw an exception when |
| a query runs longer than a configured amount of time. |
| This feature is enabled by setting the `critical-heap-percentage` attribute |
| which detects that the JVM has too little heap memory. |
| |
| The default query timeout is five hours. |
| Set a different amount of time, in milliseconds, |
| by specifying the system variable `gemfire.Cache.MAX_QUERY_EXECUTION_TIME`. |
| A value of -1 explicitly disables the timeout. |
| |
| When enabled, a query that runs longer than the configured timeout |
| will be cancelled such that it does not finish, |
| and <%=vars.product_name%> throws a `QueryExecutionTimeoutException`. |