Clickhosue ck ch DB::Exception: Memory limit (total) exceeded

1.异常信息

<Error> ConfigReloader: void DB::ConfigReloader::run(): Code: 241, e.displayText() = DB::Exception: Memory limi  t (total) exceeded: would use 19.24 GiB (attempt to allocate chunk of 5242880 bytes), maximum: 18.63 GiB, Stack trace (when copying this message, alway  s include the lines below):
0.  Poco::Exception::Exception(std::1::basic_string<char, std::1::char_traits<char>, std::__1::allocator<char> > const&, int) @ 0x18e02790 in /usr/b  in/clickhouse
1.  DB::Exception::Exception(std::1::basic_string<char, std::1::char_traits<char>, std::__1::allocator<char> > const&, int) @ 0xe72fdad in /usr/bin/  clickhouse
2.  ? @ 0xe71dee0 in /usr/bin/clickhouse
3.  MemoryTracker::alloc(long) @ 0xe71c798 in /usr/bin/clickhouse
4.  operator new[](unsigned%20long) @ 0xe71af6c in /usr/bin/clickhouse
5.  Poco::XML::NamePool::NamePool(unsigned long) @ 0x18d84fca in /usr/bin/clickhouse

2.解决

1.config.xml修改每个节点上的config.xml配置文件里的服务器使用最大RAM量<max_server_memory_usage>xxx</max_server_memory_usage>
2.users.xml修改每个节点上的users.xml配置文件里的，用于在单个服务器上运行查询的最大RAM量<max_memory_usage>xxx</max_memory_usage>

3.扩展

1.max_memory_usage含义：用于在单个服务器上运行查询的最大RAM量默认值： 10G内存的使用也受限于这两个参数1)max_memory_usage_for_user用于在单个服务器上运行用户查询的最大RAM量默认值定义在 Settings.h （https://github.com/ClickHouse/ClickHouse/blob/master/src/Core/Settings.h）默认值是0， max_memory_usage_for_user = 0 表示不受限2)max_server_memory_usage详见 22.max_server_memory_usage含义：限制ClickHouse服务器节点的总RAM使用量默认值： 0 默认情况下的计算公式如下：max_server_memory_usage = memory_amount（内存总量） * max_server_memory_usage_to_ram_ratio（占比分数值）3.max_server_memory_usage_to_ram_ratio含义：定义可用于Clickhouse服务器的总物理RAM量的一部分。如果想要服务器利用更多资源（限制ck应用在内存占用），则会将内存减少到适当的数量默认值：0 表示Clickhouse服务器可以使用所有可用的RAM官方建议：在具有低RAM和交换容量的主机上，可能需要将max_server_memory_usage_to_ram_ratio设置为大于1

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Clickhosue ck ch DB::Exception: Memory limit (total) exceeded

1.异常信息

2.解决

3.扩展

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