我正在使用MariaDB＆amp; Apache（LAMP）和我的VPS Ram是512MB。
现在问题有时当我使用top时，MariaDB进程使用506MB的RAM，所以我想优化我的MariaDB。
以下是./mysqltuner.pl的结果：
[!!] Currently running unsupported MySQL version 10.0.11-MariaDB-log
[OK] Operating on 32-bit architecture with less than 2GB RAM
-------- Storage Engine Statistics -------------------------------------------
[--] Status: +ARCHIVE +Aria +BLACKHOLE +CSV +FEDERATED +InnoDB +MRG_MyISAM
[--] Data in MyISAM tables: 33M (Tables: 94)
[--] Data in InnoDB tables: 6M (Tables: 111)
[--] Data in CSV tables: 0B (Tables: 2)
[--] Data in PERFORMANCE_SCHEMA tables: 0B (Tables: 52)
[!!] Total fragmented tables: 4
-------- Security Recommendations -------------------------------------------
[OK] All database users have passwords assigned
-------- Performance Metrics -------------------------------------------------
[--] Up for: 8m 39s (3K q [7.657 qps], 39 conn, TX: 32M, RX: 513K)
[--] Reads / Writes: 98% / 2%
[--] Total buffers: 94.0M global + 26.3M per thread (50 max threads)
[!!] Maximum possible memory usage: 1.4G (282% of installed RAM)
[OK] Slow queries: 0% (0/3K)
[OK] Highest usage of available connections: 4% (2/50)
[OK] Key buffer size / total MyISAM indexes: 4.0M/3.9M
[OK] Key buffer hit rate: 99.0% (29K cached / 281 reads)
[OK] Query cache efficiency: 40.9% (2K cached / 6K selects)
[OK] Query cache prunes per day: 0
[OK] Sorts requiring temporary tables: 0% (0 temp sorts / 481 sorts)
[!!] Temporary tables created on disk: 35% (75 on disk / 213 total)
[OK] Thread cache hit rate: 94% (2 created / 39 connections)
[OK] Table cache hit rate: 493% (79 open / 16 opened)
[OK] Open file limit used: 0% (52/65K)
[OK] Table locks acquired immediately: 100% (1K immediate / 1K locks)
[OK] InnoDB buffer pool / data size: 64.0M/6.3M
[OK] InnoDB log waits: 0
-------- Recommendations -----------------------------------------------------
General recommendations:
Run OPTIMIZE TABLE to defragment tables for better performance
MySQL started within last 24 hours - recommendations may be inaccurate
Reduce your overall MySQL memory footprint for system stability
When making adjustments, make tmp_table_size/max_heap_table_size equal
Reduce your SELECT DISTINCT queries without LIMIT clauses
Variables to adjust:
*** MySQL's maximum memory usage is dangerously high ***
*** Add RAM before increasing MySQL buffer variables ***
tmp_table_size (> 16M)
max_heap_table_size (> 8M)
这是my.cnf的内容：
[client]
port = 3306
socket = /tmp/mysql.sock
[mysqld]
port = 3306
socket = /tmp/mysql.sock
basedir = /usr/local/mariadb
datadir = /data/mariadb
pid-file = /data/mariadb/mysql.pid
user = mysql
bind-address = 0.0.0.0
server-id = 1
skip-name-resolve
#skip-networking
back_log = 300
max_connections = 20
max_connect_errors = 6000
open_files_limit = 65535
table_open_cache = 128
max_allowed_packet = 4M
binlog_cache_size = 1M
max_heap_table_size = 8M
tmp_table_size = 16M
read_buffer_size = 2M
read_rnd_buffer_size = 8M
sort_buffer_size = 8M
join_buffer_size = 8M
key_buffer_size = 4M
thread_cache_size = 8
query_cache_size = 8M
query_cache_limit = 2M
ft_min_word_len = 4
log_bin = mysql-bin
binlog_format = mixed
expire_logs_days = 30
log_error = /data/mariadb/mysql-error.log
slow_query_log = 1
long_query_time = 1
slow_query_log_file = /data/mariadb/mysql-slow.log
performance_schema = 0
#lower_case_table_names = 1
skip-external-locking
default_storage_engine = InnoDB
#default-storage-engine = MyISAM
innodb_file_per_table = 1
innodb_open_files = 500
innodb_buffer_pool_size = 64M
innodb_write_io_threads = 4
innodb_read_io_threads = 4
innodb_thread_concurrency = 0
innodb_purge_threads = 1
innodb_flush_log_at_trx_commit = 2
innodb_log_buffer_size = 2M
innodb_log_file_size = 32M
innodb_log_files_in_group = 3
innodb_max_dirty_pages_pct = 90
innodb_lock_wait_timeout = 120
bulk_insert_buffer_size = 8M
myisam_sort_buffer_size = 8M
myisam_max_sort_file_size = 10G
myisam_repair_threads = 1
interactive_timeout = 28800
wait_timeout = 30
[mysqldump]
quick
max_allowed_packet = 16M
[myisamchk]
key_buffer_size = 8M
sort_buffer_size = 8M
read_buffer = 4M
write_buffer = 4M
我不知道我能做什么。请帮帮我！
答案 0 :(得分：1)
您应该使用github上提供的最新版本。 记忆建议似乎是错误的，并且自那以后一直在纠正。
可以使用tmp_table_size和max_heap_table_size变量配置临时表。
https://www.percona.com/blog/2007/01/19/tmp_table_size-and-max_heap_table_size/