Question

服务器专用128 GB RAM的推荐配置是什么

的my.cnf

[mysqld]
datadir="/home/mysql"
default-storage-engine=MyISAM
innodb_file_per_table=1
max_allowed_packet=268435456

innodb_buffer_pool_size = 94G
innodb_buffer_pool_instances = 12
innodb_open_files=20000
innodb_io_capacity=10000
innodb_io_capacity_max=25000
innodb_read_io_threads=8
innodb_write_io_threads=8
innodb_flush_log_at_trx_commit=2
innodb_max_dirty_pages_pct = 90


open_files_limit=100000

interactive_timeout=60
wait_timeout=60

max_connections=20000
max_connect_errors=20000

tmp_table_size=1G
max_heap_table_size=1G

# MyISAM
key_buffer_size = 1G

join_buffer_size = 10M
sort_buffer_size=256K
read_buffer_size=64K
read_rnd_buffer_size=256K

slow-query-log
table_open_cache = 5000

query_cache_type = 1
query_cache_limit = 10M
query_cache_min_res_unit = 1M
query_cache_size = 256M

thread_cache_size = 4

skip_name_resolve=ON

MySQLTuning：

>>  MySQLTuner 1.4.0 - Major Hayden <major@mhtx.net>
>>  Bug reports, feature requests, and downloads at http://mysqltuner.com/
>>  Run with '--help' for additional options and output filtering
[!!] Currently running unsupported MySQL version 10.0.17-MariaDB-log
[OK] Operating on 64-bit architecture

-------- Storage Engine Statistics -------------------------------------------
[--] Status: +ARCHIVE +Aria +BLACKHOLE +CSV +FEDERATED +InnoDB +MRG_MyISAM
[--] Data in MyISAM tables: 603M (Tables: 470)
[--] Data in InnoDB tables: 93G (Tables: 563)
[--] Data in PERFORMANCE_SCHEMA tables: 0B (Tables: 52)
[--] Data in MEMORY tables: 60K (Tables: 3)
[!!] Total fragmented tables: 216

-------- Performance Metrics -------------------------------------------------
[--] Up for: 16h 58m 38s (22M q [366.226 qps], 920K conn, TX: 8B, RX: 1B)
[--] Reads / Writes: 35% / 65%
[--] Total buffers: 96.1G global + 10.8M per thread (20000 max threads)
[!!] Maximum possible memory usage: 307.9G (244% of installed RAM)
[OK] Slow queries: 0% (0/22M)
[OK] Highest usage of available connections: 0% (106/20000)
[OK] Key buffer size / total MyISAM indexes: 1.0G/589.3M
[OK] Key buffer hit rate: 99.7% (28M cached / 74K reads)
[OK] Query cache efficiency: 22.8% (1M cached / 6M selects)
[!!] Query cache prunes per day: 1568144
[OK] Sorts requiring temporary tables: 0% (0 temp sorts / 46K sorts)
[OK] Temporary tables created on disk: 5% (3K on disk / 66K total)
[OK] Thread cache hit rate: 98% (14K created / 920K connections)
[OK] Table cache hit rate: 104% (1K open / 1K opened)
[OK] Open file limit used: 1% (1K/100K)
[OK] Table locks acquired immediately: 99% (14M immediate / 14M locks)
[OK] InnoDB buffer pool / data size: 94.0G/93.2G
[OK] InnoDB log waits: 0

我有一个很大的数据库我的cpu用法：

http://i.stack.imgur.com/4azch.png

http://i.stack.imgur.com/mm7oZ.png

并拥有5k用户

查询：

SELECT * FROM users ORDER BY RAND();

在用户中有+ 900k行非常慢

Answer 1

价值是虚假的。它是根据最坏情况组合计算出来的。它甚至不包括所有案例！

然而，这是荒谬的：

max_connections = 20000 [OK]可用连接的最高使用率：0％（106/20000）

即使是2000，也很少是一个合理的数字。降低它。如果你确实点击了max_connections，那么其他地方就会出现问题。无论如何，请注意Max_used_connections只有106.（106有点高，但不一定是个问题。）

tmp_table_size的= 1G max_heap_table_size = 1G

如果你运行20K SELECT，每个需要3个tmp表，可能需要多达60TB的RAM！因此，将这两个设置降低为防止RAM耗尽的额外保护。对于MySQL，交换是非常糟糕的。

[!!]总碎片表：216

忽略这一点;桌子通常是零散的;采取行动是不值得的。

[确定]慢查询：0％（0 / 22M）

将long_query_time降低到比如2（秒）。

[!!]每天查询缓存李子：1568144

听起来像打开查询缓存（1）是有害的。

[确定]密钥缓冲区大小/总MyISAM索引：1.0G / 589.3M

认真考虑改用InnoDB。

Answer 2

东西？

[mysqld]
datadir = "/home/mysql"
default-storage-engine = MyISAM
innodb_file_per_table = 1
max_allowed_packet = 268435456

innodb_buffer_pool_size = 94G
innodb_buffer_pool_instances = 12
innodb_open_files = 20000
innodb_io_capacity = 10000
innodb_io_capacity_max = 25000
innodb_read_io_threads = 8
innodb_write_io_threads = 8
innodb_flush_log_at_trx_commit = 2
innodb_max_dirty_pages_pct = 90


open_files_limit = 100000

interactive_timeout = 60
wait_timeout = 60

max_connections = 20000
max_connect_errors = 20000

tmp_table_size = 60M
max_heap_table_size = 60M

# MyISAM
key_buffer_size = 1G

join_buffer_size = 10M
sort_buffer_size = 256K
read_buffer_size = 64K
read_rnd_buffer_size = 256K

slow-query-log
table_open_cache = 5000

query_cache_type = 1
query_cache_limit = 10M
query_cache_min_res_unit = 1M
query_cache_size = 512M

log_queries_not_using_indexes = 0
long_query_time = 2

thread_cache_size = 4

skip_name_resolve = ON

最大内存使用量：307.9G（已安装RAM的244％）

2 个答案: