* @see https://www.percona.com/doc/percona-toolkit/2.1/pt-heartbeat.html
*/
protected function getHeartbeatData( array $conds ) {
- $whereSQL = $this->makeList( $conds, self::LIST_AND );
- // Use ORDER BY for channel based queries since that field might not be UNIQUE.
- // Note: this would use "TIMESTAMPDIFF(MICROSECOND,ts,UTC_TIMESTAMP(6))" but the
- // percision field is not supported in MySQL <= 5.5.
- $res = $this->query(
- "SELECT ts FROM heartbeat.heartbeat WHERE $whereSQL ORDER BY ts DESC LIMIT 1"
- );
- $row = $res ? $res->fetchObject() : false;
+ // Do not bother starting implicit transactions here
+ $this->clearFlag( self::DBO_TRX, self::REMEMBER_PRIOR );
+ try {
+ $whereSQL = $this->makeList( $conds, self::LIST_AND );
+ // Use ORDER BY for channel based queries since that field might not be UNIQUE.
+ // Note: this would use "TIMESTAMPDIFF(MICROSECOND,ts,UTC_TIMESTAMP(6))" but the
+ // percision field is not supported in MySQL <= 5.5.
+ $res = $this->query(
+ "SELECT ts FROM heartbeat.heartbeat WHERE $whereSQL ORDER BY ts DESC LIMIT 1"
+ );
+ $row = $res ? $res->fetchObject() : false;
+ } finally {
+ $this->restoreFlags();
+ }
return [ $row ? $row->ts : null, microtime( true ) ];
}