如果您能帮助解决mysqld性能问题，我将不胜感激，如下所示。 top显示了2个mysqld，CPU使用率为99％，内存使用率为73％。
我总共拥有6CPU和8GB内存。您可以在过去24小时内轻松查看CPU的性能。
我也在发送mysql调谐器的输出。
- ＆GT; mysqltuner输出：
[--] Skipped version check for MySQLTuner script
[OK] Currently running supported MySQL version 10.1.24-MariaDB
[OK] Operating on 64-bit architecture
-------- Log file Recommendations ------------------------------------------------------------------
[--] Log file: (0B)
[!!] Log file doesn't exist
[!!] Log file isn't readable.
-------- Storage Engine Statistics -----------------------------------------------------------------
[--] Status: +Aria +CSV +InnoDB +MEMORY +MRG_MyISAM +MyISAM +PERFORMANCE_SCHEMA +SEQUENCE
[--] Data in InnoDB tables: 15G (Tables: 121)
[--] Data in MEMORY tables: 0B (Tables: 2)
[OK] Total fragmented tables: 0
-------- Security Recommendations ------------------------------------------------------------------
[OK] There are no anonymous accounts for any database users
[OK] All database users have passwords assigned
[!!] User 'kepmark_readonly@%' hasn't specific host restriction.
[!!] User 'kpm_zeus_fsm@%' hasn't specific host restriction.
[!!] User 'root@%' hasn't specific host restriction.
[--] There are 612 basic passwords in the list.
-------- CVE Security Recommendations --------------------------------------------------------------
[OK] NO SECURITY CVE FOUND FOR YOUR VERSION
-------- Performance Metrics -----------------------------------------------------------------------
[--] Up for: 11d 19h 19m 33s (37M q [36.944 qps], 3M conn, TX: 30G, RX: 3G)
[--] Reads / Writes: 50% / 50%
[--] Binary logging is disabled
[--] Physical Memory : 11.7G
[--] Max MySQL memory : 8.7G
[--] Other process memory: 702.6M
[--] Total buffers: 8.3G global + 2.9M per thread (151 max threads)
[--] P_S Max memory usage: 0B
[--] Galera GCache Max memory usage: 0B
[OK] Maximum reached memory usage: 8.5G (72.61% of installed RAM)
[OK] Maximum possible memory usage: 8.7G (74.32% of installed RAM)
[OK] Overall possible memory usage with other process is compatible with memory available
[OK] Slow queries: 0% (18K/37M)
[OK] Highest usage of available connections: 52% (80/151)
[OK] Aborted connections: 0.35% (10593/3009097)
[!!] Query cache may be disabled by default due to mutex contention.
[!!] Query cache efficiency: 0.0% (0 cached / 16M selects)
[OK] Query cache prunes per day: 0
[OK] Sorts requiring temporary tables: 0% (165 temp sorts / 34K sorts)
[OK] No joins without indexes
[OK] Temporary tables created on disk: 0% (1K on disk / 4M total)
[!!] Thread cache is disabled
[!!] Table cache hit rate: 11% (398 open / 3K opened)
[OK] Open file limit used: 0% (66/16K)
[OK] Table locks acquired immediately: 99% (41M immediate / 41M locks)
-------- Performance schema ------------------------------------------------------------------------
[--] Performance schema is disabled.
[--] Memory used by P_S: 0B
[--] Sys schema isn't installed.
-------- ThreadPool Metrics ------------------------------------------------------------------------
[--] ThreadPool stat is enabled.
[--] Thread Pool Size: 6 thread(s).
[--] Using default value is good enough for your version (10.1.24-MariaDB)
-------- MyISAM Metrics ----------------------------------------------------------------------------
[!!] Key buffer used: 18.2% (24M used / 134M cache)
[OK] Key buffer size / total MyISAM indexes: 128.0M/126.0K
[OK] Read Key buffer hit rate: 100.0% (709K cached / 50 reads)
-------- InnoDB Metrics ----------------------------------------------------------------------------
[--] InnoDB is enabled.
[--] InnoDB Thread Concurrency: 0
[OK] InnoDB File per table is activated
[!!] InnoDB buffer pool / data size: 8.0G/15.2G
[!!] Ratio InnoDB log file size / InnoDB Buffer pool size (1.171875 %): 48.0M * 2/8.0G should be equal 25%
[!!] InnoDB buffer pool instances: 6
[--] InnoDB Buffer Pool Chunk Size not used or defined in your version
[OK] InnoDB Read buffer efficiency: 100.00% (299698901815 hits/ 299706339317 total)
[!!] InnoDB Write Log efficiency: 22.18% (1601644 hits/ 7221004 total)
[OK] InnoDB log waits: 0.00% (0 waits / 5619360 writes)
-------- AriaDB Metrics ----------------------------------------------------------------------------
[--] AriaDB is enabled.
[OK] Aria pagecache size / total Aria indexes: 128.0M/1B
[!!] Aria pagecache hit rate: 75.8% (4K cached / 1K reads)
-------- 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 is a standalone server.
-------- Recommendations ---------------------------------------------------------------------------
General recommendations:
Restrict Host for user@% to user@SpecificDNSorIp
Set thread_cache_size to 4 as a starting value
Increase table_open_cache gradually to avoid file descriptor limits
Read this before increasing table_open_cache over 64:
Beware that open_files_limit (16364) variable
should be greater than table_open_cache (2000)
Performance should be activated for better diagnostics
Consider installing Sys schema from https://github.com/mysql/mysql-sys
Variables to adjust:
query_cache_size (=0)
query_cache_type (=0)
query_cache_limit (> 4M, or use smaller result sets)
thread_cache_size (start at 4)
table_open_cache (> 2000)
performance_schema = ON enable PFS
innodb_buffer_pool_size (>= 15G) if possible.
innodb_log_file_size * innodb_log_files_in_group should be equal to 1/4 of buffer pool size (=4G) if possible.
innodb_buffer_pool_instances(=8)
答案 0 :(得分：0)
在你的最高输出中，两个MYSQLD的原因是什么？
根据提供的调谐器信息，为[mysqld]部分中的.cnf（或.ini）考虑建议。每天不要更改超过1个项目。保留最后3个.cnf的副本以防万一。
购买更多内存，如果可能，最低24G是可取的
max_connections=100 # from 151 08/17/2017, only 80 used
have_query_cache=0 # from YES mm/dd/ccyy, to avoid QC overhead
query_cache_size=0 # is 0 mm/dd/ccyy, KEEP it at 0
thread_cache_size=4 # from 0 mm/dd/ccyy, to minimize thread creation overhead
table_open_cache=3000 # from 2000 mm/dd/ccyy, suggested by tuner
open_files_limit=1024 # from 16k, only 66 in use at 24 hr mark
key_buffer_size=(calc90%) # from 134M until Read key buffer hit rate is less than 100% reported by tuner
要进行更全面的分析，请提供当前RAM（nnG）
SHOW GLOBAL STATUS;
SHOW GLOBAL VARIABLES;
SHOW ENGINE INNODB STATUS
调谐器报告的每个线程2.9M应在mysqlcalculator.com的帮助下进行分析，以将默认值与您的值进行比较，如
所示。SHOW GLOBAL VARIABLES;
某些项目似乎过多。
答案 1 :(得分：0)
“99％的cpu使用率” - “你无法调整解决性能问题的方法。”
所以，找到最慢的查询。修理它。冲洗并重复。在（通常）2-3次查询之后，CPU将下降到10％。
如何找到它们？使用long_query_time=1打开slowlog。
如何修复查询？向我们展示一个查询EXPLAIN ...和SHOW CREATE TABLE。同时，阅读“复合”指数。
（73％的内存使用率没问题。）