我最近将运行 MySQL 的旧服务器迁移到运行 MariaDB 5.5 的新 VPS。服务器上没有运行太多程序(只有几个 PHP 网站),可用内存似乎没问题,但数据库不断崩溃——有时每隔几天就会崩溃一次,有时几小时内就会崩溃一次。
我在日志中收到以下错误:
131231 1:43:04 [ERROR] mysqld: Out of memory (Needed 128917504 bytes)
131231 1:43:04 [ERROR] mysqld: Out of memory (Needed 96681984 bytes)
131231 1:43:04 [ERROR] mysqld: Out of memory (Needed 72499200 bytes)
131231 1:43:04 [ERROR] mysqld: Out of memory (Needed 54362112 bytes)
131231 1:43:04 InnoDB: The InnoDB memory heap is disabled
131231 1:43:04 InnoDB: Mutexes and rw_locks use GCC atomic builtins
131231 1:43:04 InnoDB: Compressed tables use zlib 1.2.3.4
131231 1:43:04 InnoDB: Using Linux native AIO
131231 1:43:04 InnoDB: Initializing buffer pool, size = 128.0M
InnoDB: mmap(137756672 bytes) failed; errno 12
131231 1:43:04 InnoDB: Completed initialization of buffer pool
131231 1:43:04 InnoDB: Fatal error: cannot allocate memory for the buffer pool
131231 1:43:04 [ERROR] Plugin 'InnoDB' init function returned error.
131231 1:43:04 [ERROR] Plugin 'InnoDB' registration as a STORAGE ENGINE failed.
131231 1:43:04 [Note] Plugin 'FEEDBACK' is disabled.
131231 1:43:04 [ERROR] Unknown/unsupported storage engine: InnoDB
131231 1:43:04 [ERROR] Aborting
131231 1:43:04 [Note] /usr/sbin/mysqld: Shutdown complete
我尝试过 InnoDB Heap 的 my.cnf 设置,但似乎没有帮助。以下是相关部分:
innodb_buffer_pool_size = 128M
innodb_log_buffer_size = 8M
innodb_file_per_table = 1
innodb_open_files = 400
innodb_io_capacity = 400
innodb_flush_method = O_DIRECT
我似乎有“大量”的可用 RAM,并且还有一些可用的交换空间:
root@phoenix:~# free -m
total used free shared buffers cached
Mem: 994 923 71 0 19 417
-/+ buffers/cache: 486 508
Swap: 1023 131 892
我该如何解决/排除此问题?我在网上搜索了各种线索,但毫无帮助。
答案1
希望对你有帮助。
尝试
performance_schema = off
在[mysqld]
您的配置部分中。
https://mariadb.com/resources/blog/starting-mysql-on-low-memory-virtual-machines/