snapshot is older than GC safe point

1.SELECT * FROM mysql.tidb WHERE variable_name = ‘tikv_gc_safe_point’;
可以执行这语句查看下safe_point，选择safe_point内的snapshot进行对比
2.UPDATE mysql.tidb SET VARIABLE_VALUE = ‘3h’ WHERE VARIABLE_NAME=‘tikv_gc_life_time’;
默认是10分钟，可以设置3h,根据自己维护时间去设置合适的时长