mysql - mysqldump 挂起服务器

Question

我有个问题。我在我的一台服务器 (eAthena) 上运行开源游戏软件，他们使用 MySQL 作为首选数据库。但是，每次我运行 mysqldump

mysqldump -u backup -p*** eathena > test-backup.sql

它最终挂起服务器。eAthena 软件挂起，并在完成后关闭。这是尺寸问题吗？看到数据库是 4.7gb，我不知道该怪什么。我的mysqldump有什么替代品吗？

我正在运行 CentOS 6 64 位，MySQL 版本 5.1.52。

Answer 1

看来您的 mysql 安装内存不足。检查 /etc/my.cnf 或 /etc/mysql/my.cnf（或 CentOS 上的任何位置）。

增加 table_cache 和 key_buffer_size 。查看mysql安装附带的confs示例：my-huge.cnf’,my-large.cnf'，my-medium.cnf’, andmy-small.cnf'。将您的 confs 与此进行比较：

[mysqld]
# Reduced to 200 as memory will not be enough for 500 connections.
# memory=key_buffer+sort_buffer_size+read_buffer_size)*max_connections
# which is now: 64 + (1 + 1) * 200 = 464 MB
# max_connections = approx. MaxClients setting in httpd.conf file
# Default set to 100.
max_connections = 100
max_allowed_packet = 1M
max_connect_errors = 10
key_buffer = 512M # 128M for 1GB, 256M for 2GB, 512 for 4GB
join_buffer_size = 4M # 1M for 1GB, 2M for 2GB, 4M for 4GB
read_buffer_size = 4M # 1M for 1GB, 2M for 2GB, 4M for 4GB
sort_buffer_size = 2M # 1M for 1GB, 2M for 2GB, 4M for 4GB
# myisam_sort_buffer_size used for ALTER, OPTIMIZE, REPAIR TABLE commands.
myisam_sort_buffer_size = 32M
# Checked opened tables and adjusted accordingly after running for a while.
table_cache = 1024
# thread_concurrency = 2 * (no. of CPU)
thread_concurrency=4
thread_cache_size = 286
# log slow queries is a must. Many queries that take more than 2 seconds.
# If so, then your tables need enhancement.
log_slow_queries=/var/log/mysqld.slow.log
long_query_time=2
# Reduced wait_timeout to prevent idle clients holding connections.
wait_timeout = 10
connect_timeout = 10
interactive_timeout = 10
# Enable it for vast improvement and it may be all you need to tweak.
query_cache_limit = 1M
query_cache_size = 128M
query_cache_type = 1
[mysqld_safe]
open_files_limit = 8192
[mysqldump]
quick
max_allowed_packet = 16M
[myisamchk]
key_buffer = 256M # 64M for 1GB, 128M for 2GB, 256 for 4GB
sort_buffer = 256M # 64M for 1GB, 128M for 2GB, 256 for 4GB
read_buffer = 64M # 16M for 1GB, 32M for 2GB, 64M for 4GB
write_buffer = 64M # 16M for 1GB, 32M for 2GB, 64M for 4GB
[mysqlhotcopy]
interactive-timeout

在重试之前不要忘记重新启动 mysql 服务器