[MEM_LIMIT_EXCEEDED]Process memory not enough, cancel top memory used query

[dyrnq]

ERROR 1105 (HY000): errCode = 2, detailMessage = (192.168.76.153)[MEM_LIMIT_EXCEEDED]Process memory not enough, cancel top memory used query: <Query#Id=63bded01667a46bd-909352b812f8143c> consumption 0, backend 192.168.76.153, process memory used 4.13 GB exceed limit 14.06 GB or sys available memory 289.10 MB less than low water mark 799.59 MB. Execute again after enough memory, details see be.INFO.
mysql> select count(*) from testdb.nginx_access_log;
ERROR 1105 (HY000): errCode = 2, detailMessage = (192.168.76.154)[INTERNAL_ERROR]Failed to get query fragments context. Query may be timeout or be cancelled. host: 192.168.76.154

[dyrnq]

ERROR 1105 (HY000): errCode = 2, detailMessage = (192.168.76.154)[MEM_ALLOC_FAILED]Create Expr failed because [E11] Allocator sys memory check failed: Cannot alloc:64, consuming tracker:<Query#Id=e92041a27ea6479a-a93eb5681f75fa7f>, peak used 0, current used 0, exec node:<>, process memory used 3.60 GB exceed limit 14.84 GB or sys available memory 610.01 MB less than low water mark 799.59 MB.