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Merge pull request #52 from Kingsrook/feature/gc-perf-debug

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Feature/gc perf debug
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darin.kelkhoff
2023-12-18 11:48:52 -06:00
committed by GitHub
parent 9144754e74 5f586d30c7
commit d1bfc834d6
1 changed files with 7 additions and 9 deletions
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16
qqq-backend-module-rdbms/src/main/java/com/kingsrook/qqq/backend/module/rdbms/actions/RDBMSQueryAction.java
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@ -53,7 +53,6 @@ import com.kingsrook.qqq.backend.core.model.metadata.tables.QTableMetaData;
import com.kingsrook.qqq.backend.core.utils.CollectionUtils;
import com.kingsrook.qqq.backend.core.utils.Pair;
import com.kingsrook.qqq.backend.module.rdbms.jdbc.QueryManager;
import com.kingsrook.qqq.backend.module.rdbms.model.metadata.RDBMSBackendMetaData;
/*******************************************************************************
@ -343,15 +342,14 @@ public class RDBMSQueryAction extends AbstractRDBMSAction implements QueryInterf
*******************************************************************************/
private PreparedStatement createStatement(Connection connection, String sql, QueryInput queryInput) throws SQLException
{
RDBMSBackendMetaData backend = (RDBMSBackendMetaData) queryInput.getBackend();
PreparedStatement statement;
if("mysql".equals(backend.getVendor()))
PreparedStatement statement;
if(connection.getClass().getName().startsWith("com.mysql"))
{
/////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////
// mysql "optimization", presumably here - from Result Set section of https://dev.mysql.com/doc/connector-j/8.0/en/connector-j-reference-implementation-notes.html //
// without this change, we saw ~10 seconds of "wait" time, before results would start to stream out of a large query (e.g., > 1,000,000 rows). //
// with this change, we start to get results immediately, and the total runtime also seems lower... //
/////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////
/////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////
// mysql "optimization", presumably here - from Result Set section of https://dev.mysql.com/doc/connector-j/en/connector-j-reference-implementation-notes.html //
// without this change, we saw ~10 seconds of "wait" time, before results would start to stream out of a large query (e.g., > 1,000,000 rows). //
// with this change, we start to get results immediately, and the total runtime also seems lower... //
/////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////
statement = connection.prepareStatement(sql, ResultSet.TYPE_FORWARD_ONLY, ResultSet.CONCUR_READ_ONLY);
statement.setFetchSize(Integer.MIN_VALUE);
}