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我運行了MySQLTuner腳本，並遵循了他們給出的建議，但它仍然建議增加，同時告訴我MySQL的最大內存使用率很高。MySQL優化 - MySQL的最大內存使用率很高
我有一個64 GB RAM的CentOS 6.5。
的車輛的地理定位的應用程序部署該服務器（數據的一個巨大的流/ 4000個多標記連接到該服務器）
數據庫的大小超過28GB上（大於18726個表）
我在我的my.cnf文件當前配置爲：
[mysqld]
server-id = 1
auto_increment_increment=2
log-slave-updates
slave-skip-errors =1146,1062,126
expire_logs_days = 10
max_binlog_size = 100M
relay-log = "/var/lib/mysql/mysql-relay-bin"
relay-log-index = "/var/lib/mysql/mysql-relay-bin.index"
log-error = "/var/lib/mysql/mysql.err"
master-info-file = "/var/lib/mysql/mysql-master.info"
relay-log-info-file = "/var/lib/mysql/mysql-relay-log.info"
datadir="/var/lib/mysql"
socket="/var/lib/mysql/mysql.sock"
symbolic-links=0
skip-host-cache
skip-name-resolve
open_files_limit=65535
query_cache_size=0
max_connections=500
max_user_connections=800
wait_timeout=120
tmp_table_size=32M
max_heap_table_size=32M
thread_cache_size=50
key_buffer_size=3G
max_allowed_packet=16M
table_cache=64K
join_buffer_size =32M
table_definition_cache=4096
table-open-cache=10240
myisam_sort_buffer_size=64M
read_buffer_size=64M
log-output=NONE
innodb_file_per_table=1
innodb_flush_method=O_DIRECT
innodb_buffer_pool_size=38G
innodb_additional_mem_pool_size=2048M
innodb_log_buffer_size=1024M
innodb_thread_concurrency=16
innodb_flush_log_at_trx_commit=0
[mysqld_safe]
log-error="/var/log/mysqld.log"
pid-file="/var/run/mysqld/mysqld.pid"
當我運行mysqltuner.pl，這是我所得到的：
-------- Log file Recommendations ------------------------------------------------------------------
[--] Log file: /var/log/mysqld.log(10B)
[OK] Log file /var/log/mysqld.log exists
[OK] Log file /var/log/mysqld.log is readable.
[OK] Log file /var/log/mysqld.log is not empty
[OK] Log file /var/log/mysqld.log is smaller than 32 Mb
[OK] /var/log/mysqld.log doesn't contain any warning.
[OK] /var/log/mysqld.log doesn't contain any error.
[--] 0 start(s) detected in /var/log/mysqld.log
[--] 0 shutdown(s) detected in /var/log/mysqld.log
-------- Storage Engine Statistics -----------------------------------------------------------------
[--] Status: +ARCHIVE +BLACKHOLE +CSV -FEDERATED +InnoDB +MEMORY +MRG_MYISAM +MyISAM +PERFORMANCE_SCHEMA
[--] Data in MyISAM tables: 3G (Tables: 2341)
[--] Data in InnoDB tables: 23G (Tables: 16806)
[OK] Total fragmented tables: 0
-------- CVE Security Recommendations --------------------------------------------------------------
[--] Skipped due to --cvefile option undefined
-------- Performance Metrics -----------------------------------------------------------------------
[--] Up for: 20m 8s (1M q [930.905 qps], 117K conn, TX: 1G, RX: 138M)
[--] Reads/Writes: 19%/81%
[--] Binary logging is disabled
[--] Physical Memory : 62.9G
[--] Max MySQL memory : 92.1G
[--] Other process memory: 10.6G
[--] Total buffers: 44.0G global + 98.5M per thread (500 max threads)
[--] P_S Max memory usage: 0B
[--] Galera GCache Max memory usage: 0B
[!!] Maximum reached memory usage: 54.9G (87.30% of installed RAM)
[!!] Maximum possible memory usage: 92.1G (146.50% of installed RAM)
[!!] Overall possible memory usage with other process exceeded memory
[OK] Slow queries: 0% (5/1M)
[OK] Highest usage of available connections: 22% (113/500)
[OK] Aborted connections: 0.00% (3/117330)
[!!] Query cache is disabled
[OK] Sorts requiring temporary tables: 0% (0 temp sorts/6K sorts)
[!!] Joins performed without indexes: 133
[OK] Temporary tables created on disk: 0% (541 on disk/233K total)
[OK] Thread cache hit rate: 99% (132 created/117K connections)
[!!] Table cache hit rate: 7% (10K open/129K opened)
[OK] Open file limit used: 3% (2K/65K)
[OK] Table locks acquired immediately: 99% (304K immediate/304K locks)
-------- Performance schema ------------------------------------------------------------------------
[--] Performance schema is disabled.
[--] Memory used by P_S: 0B
[--] Sys schema isn't installed.
-------- ThreadPool Metrics ------------------------------------------------------------------------
[--] ThreadPool stat is disabled.
-------- MyISAM Metrics ----------------------------------------------------------------------------
[!!] Key buffer used: 18.8% (605M used/3B cache)
[OK] Key buffer size/total MyISAM indexes: 3.0G/169.9M
[OK] Read Key buffer hit rate: 99.3% (1M cached/10K reads)
[!!] Write Key buffer hit rate: 0.3% (24K cached/24K writes)
-------- InnoDB Metrics ----------------------------------------------------------------------------
[--] InnoDB is enabled.
[--] InnoDB Thread Concurrency: 16
[OK] InnoDB File per table is activated
[OK] InnoDB buffer pool/data size: 38.0G/23.5G
[!!] Ratio InnoDB log file size/InnoDB Buffer pool size (0.0256990131578947 %): 5.0M * 2/38.0G should be equal 25%
[!!] InnoDB buffer pool instances: 1
[--] InnoDB Buffer Pool Chunk Size not used or defined in your version
[OK] InnoDB Read buffer efficiency: 95.56% (9270734 hits/ 9701289 total)
[OK] InnoDB Write log efficiency: 98.14% (65038 hits/ 66268 total)
[OK] InnoDB log waits: 0.00% (0 waits/1230 writes)
-------- AriaDB Metrics ----------------------------------------------------------------------------
[--] AriaDB is disabled.
-------- TokuDB Metrics ----------------------------------------------------------------------------
[--] TokuDB is disabled.
-------- XtraDB Metrics ----------------------------------------------------------------------------
[--] XtraDB is disabled.
-------- RocksDB Metrics ---------------------------------------------------------------------------
[--] RocksDB is disabled.
-------- Spider Metrics ----------------------------------------------------------------------------
[--] Spider is disabled.
-------- Connect Metrics ---------------------------------------------------------------------------
[--] Connect is disabled.
-------- Galera Metrics ----------------------------------------------------------------------------
[--] Galera is disabled.
-------- Replication Metrics -----------------------------------------------------------------------
[--] Galera Synchronous replication: NO
[--] No replication slave(s) for this server.
[!!] This replication slave is not running but seems to be configured.
-------- Recommendations ---------------------------------------------------------------------------
General recommendations:
MySQL started within last 24 hours - recommendations may be inaccurate
Reduce your overall MySQL memory footprint for system stability
Dedicate this server to your database for highest performance.
Enable the slow query log to troubleshoot bad queries
Adjust your join queries to always utilize indexes
Increase table_open_cache gradually to avoid file descriptor limits
Read this before increasing table_open_cache over 64
Beware that open_files_limit (65535) variable
should be greater than table_open_cache (10240)
Performance should be activated for better diagnostics
Consider installing Sys schema
Variables to adjust:
*** MySQL's maximum memory usage is dangerously high ***
*** Add RAM before increasing MySQL buffer variables ***
query_cache_size (>= 8M)
join_buffer_size (> 32.0M, or always use indexes with joins)
table_open_cache (> 10240)
performance_schema = ON enable PFS
innodb_log_file_size * innodb_log_files_in_group should be equals to 1/4 of buffer pool size (=19G) if possible.
innodb_buffer_pool_instances(=38)
我該怎麼做才能解決這個問題？ 預先感謝您
您的數據庫可以使用更多的內存，然後在您的系統上可用。更改配置中的最大內存。 –
如果不知道如何使用此服務器，很難提出建議。如果你需要幫助，你需要解釋一下你的應用程序。請[編輯]你的問題。你肯定在這臺服務器上花了很多錢 - 64G的RAM！你真的需要64K同時打開文件嗎？你的數據庫真的有成千上萬的表嗎？ –
在此服務器上部署車輛地理位置應用程序（一個巨大的數據流/連接到此服務器的超過4000個標記） 數據庫的大小超過28GB（超過18726個表） – BOUMARTA