hi my server cpu mysql usage 280 % my cnf file
[mysqld_safe] socket = /var/run/mysqld/mysqld.sock nice = 0 [mysqld] user = mysql pid-file = /var/run/mysqld/mysqld.pid socket = /var/run/mysqld/mysqld.sock port = 3306 basedir = /usr datadir = /var/lib/mysql tmpdir = /tmp lc-messages-dir = /usr/share/mysql skip-external-locking bind-address = 127.0.0.1 thread_stack = 192K thread_cache_size = 32 myisam-recover-options = BACKUP query_cache_limit = 128M log_error = /var/log/mysql/error.log expire_logs_days = 1 max_connections = 500 max_user_connections = 500 sort_buffer_size = 2M key_buffer_size = 128M tmp_table_size = 128M innodb_log_file_size = 16M skip-name-resolve=1 max_connect_errors = 100 concurrent_insert = 2 connect_timeout = 30 query_cache_size = 32M query_cache_type = 0 table_open_cache = 12000 open_files_limit=24000 wait_timeout = 14400 interactive_timeout = 14400 low_priority_updates = 1 read_buffer_size = 5M log_queries_not_using_indexes = 1
my mysql tunner output
>> MySQLTuner 1.7.7 - Major Hayden >> Bug reports, feature requests, and downloads at http://mysqltuner.com/ >> Run with '--help' for additional options and output filtering [--] Skipped version check for MySQLTuner script [OK] Logged in using credentials from debian maintenance account. [OK] Currently running supported MySQL version 5.7.21-0ubuntu0.16.04.1 [OK] Operating on 64-bit architecture -------- Log file Recommendations ------------------------------------------------------------------ [--] Log file: /var/log/mysql/error.log(83K) [OK] Log file /var/log/mysql/error.log exists [OK] Log file /var/log/mysql/error.log is readable. [OK] Log file /var/log/mysql/error.log is not empty [OK] Log file /var/log/mysql/error.log is smaller than 32 Mb -------- Storage Engine Statistics ----------------------------------------------------------------- [--] Status: +ARCHIVE +BLACKHOLE +CSV -FEDERATED +InnoDB +MEMORY +MRG_MYISAM +MyISAM +PERFORMANCE_SCHEMA [--] Data in MyISAM tables: 120M (Tables: 4) [--] Data in InnoDB tables: 106M (Tables: 53) [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 '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: 10m 44s (77K q [120.610 qps], 9K conn, TX: 754M, RX: 89M) [--] Reads / Writes: 78% / 22% [--] Binary logging is disabled [--] Physical Memory : 49.1G [--] Max MySQL memory : 4.8G [--] Other process memory: 494.7M [--] Total buffers: 320.0M global + 7.7M per thread (600 max threads) [--] P_S Max memory usage: 72B [--] Galera GCache Max memory usage: 0B [OK] Maximum reached memory usage: 3.3G (6.75% of installed RAM) [OK] Maximum possible memory usage: 4.8G (9.80% of installed RAM) [OK] Overall possible memory usage with other process is compatible with memory available [OK] Slow queries: 0% (0/77K) [OK] Highest usage of available connections: 66% (400/600) [OK] Aborted connections: 0.01% (1/9317) [!!] Query cache may be disabled by default due to mutex contention. [!!] Query cache efficiency: 0.0% (0 cached / 46K selects) [OK] Query cache prunes per day: 0 [OK] Sorts requiring temporary tables: 0% (0 temp sorts / 26 sorts) [OK] No joins without indexes [OK] Temporary tables created on disk: 0% (63 on disk / 9K total) [OK] Thread cache hit rate: 80% (1K created / 9K connections) [OK] Table cache hit rate: 92% (1K open / 1K opened) [OK] Open file limit used: 21% (225/1K) [!!] Table locks acquired immediately: 76% -------- Performance schema ------------------------------------------------------------------------ [--] Memory used by P_S: 72B [--] Sys schema is installed. -------- ThreadPool Metrics ------------------------------------------------------------------------ [--] ThreadPool stat is disabled. -------- MyISAM Metrics ---------------------------------------------------------------------------- [!!] Key buffer used: 18.3% (24M used / 134M cache) [OK] Key buffer size / total MyISAM indexes: 128.0M/4.5M [OK] Read Key buffer hit rate: 99.9% (12K cached / 15 reads) [!!] Write Key buffer hit rate: 38.7% (1K cached / 416 writes) -------- InnoDB Metrics ---------------------------------------------------------------------------- [--] InnoDB is enabled. [--] InnoDB Thread Concurrency: 0 [OK] InnoDB File per table is activated [OK] InnoDB buffer pool / data size: 128.0M/106.4M [OK] Ratio InnoDB log file size / InnoDB Buffer pool size: 16.0M * 2/128.0M should be equal 25% [OK] InnoDB buffer pool instances: 1 [--] Number of InnoDB Buffer Pool Chunk : 1 for 1 Buffer Pool Instance(s) [OK] Innodb_buffer_pool_size aligned with Innodb_buffer_pool_chunk_size & Innodb_buffer_pool_instances [OK] InnoDB Read buffer efficiency: 100.00% (366193213 hits/ 366199541 total) [OK] InnoDB Write log efficiency: 95.85% (219192 hits/ 228694 total) [OK] InnoDB log waits: 0.00% (0 waits / 9502 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. [--] Binlog format: ROW [--] XA support enabled: ON Use of uninitialized value $_[0] in concatenation (.) or string at mysqltuner.pl line 233 (#1) (W uninitialized) An undefined value was used as if it were already defined. It was interpreted as a "" or a 0, but maybe it was a mistake. To suppress this warning assign a defined value to your variables. To help you figure out what was undefined, perl will try to tell you the name of the variable (if any) that was undefined. In some cases it cannot do this, so it also tells you what operation you used the undefined value in. Note, however, that perl optimizes your program and the operation displayed in the warning may not necessarily appear literally in your program. For example, "that $foo" is usually optimized into "that " . $foo, and the warning will refer to the concatenation (.) operator, even though there is no . in your program. [--] [--] [--] This is a standalone server -------- Recommendations --------------------------------------------------------------------------- General recommendations: Control warning line(s) into /var/log/mysql/error.log file Control error line(s) into /var/log/mysql/error.log file Restrict Host for user@% to user@SpecificDNSorIp MySQL started within last 24 hours - recommendations may be inaccurate Optimize queries and/or use InnoDB to reduce lock wait Variables to adjust: query_cache_size (=0) query_cache_type (=0) query_cache_limit (> 128M, or use smaller result sets)
please help me
Best Answer
Suggestions to consider for your my.cnf-ini [mysqld] section
WHEN you WANT to find queries NOT using indexes,
Then, an hour later, get back to normal slow query log with:
If you could post text results of ulimit -a we would know the OS limits you are working with.
We would still like to know what your ulimit values are set to.