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CLOUDSTACK-8606: DB performance impacted due to VM sync.

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VM sync. generates a lot of queries on vm_instance table with 'instance_name' as filter. Since the field is not
indexed, these kind of queries will impact DB performance. Added an index for instance_name field.

This closes #553
This commit is contained in:
Koushik Das 2015-07-02 12:11:53 +05:30
parent 96ad6f6ccd
commit f138192c94
1 changed files with 19 additions and 0 deletions
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19
engine/schema/src/com/cloud/upgrade/dao/Upgrade452to460.java
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@ -22,6 +22,8 @@ import java.sql.Connection;
import java.sql.PreparedStatement;
import java.sql.ResultSet;
import java.sql.SQLException;
import java.util.ArrayList;
import java.util.List;
import org.apache.log4j.Logger;
@ -59,6 +61,7 @@ public class Upgrade452to460 implements DbUpgrade {
@Override
public void performDataMigration(final Connection conn) {
updateVMInstanceUserId(conn);
addIndexForVMInstance(conn);
}
public void updateVMInstanceUserId(final Connection conn) {
@ -136,6 +139,22 @@ public class Upgrade452to460 implements DbUpgrade {
}
}
private void addIndexForVMInstance(Connection conn) {
// Drop index if it exists
List<String> indexList = new ArrayList<String>();
s_logger.debug("Dropping index i_vm_instance__instance_name from vm_instance table if it exists");
indexList.add("i_vm_instance__instance_name");
DbUpgradeUtils.dropKeysIfExist(conn, "vm_instance", indexList, false);
// Now add index
try (PreparedStatement pstmt = conn.prepareStatement("ALTER TABLE `cloud`.`vm_instance` ADD INDEX `i_vm_instance__instance_name`(`instance_name`)");) {
pstmt.executeUpdate();
s_logger.debug("Added index i_vm_instance__instance_name to vm_instance table");
} catch (SQLException e) {
throw new CloudRuntimeException("Unable to add index i_vm_instance__instance_name to vm_instance table for the column instance_name", e);
}
}
@Override
public File[] getCleanupScripts() {
final String script = Script.findScript("", "db/schema-452to460-cleanup.sql");