ORACLE RAC ADG备库报错ORA-04021: timeout occurred while waiting to lock objectADG备库的ALERT错误日志如下： Errors in file /u01/app/oracle/diag/rdbms/hxxxsz/hxxxsz1/trace/hxxxsz1_lgwr_69711.trc: ORA-04021: timeout occurred while waiting to lock object Mon Dec 16 16:26:15 2024 ORA-01555 caused by SQL statement below (SQL ID: 87gaftwrm2h68, Que