问MariaDB将cpu固定在100%，需要帮助

EN

%Cpu(s):  0.3 us,  0.2 sy,  0.0 ni, 99.5 id,  0.0 wa,  0.0 hi,  0.0 si,  0.0 st

KiB Mem : 65748964 total,   494008 free,   985284 used, 64269672 buff/cache
KiB Swap: 33521660 total, 33400828 free,   120832 used. 63915376 avail Mem 

[server]
[mysqld]
max_connections = 50
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
skip-name-resolve
sort_buffer_size        = 128M
tmp_table_size          = 256MM
key_buffer_size         = 128M
max_allowed_packet      = 256M
thread_stack            = 192K
thread_cache_size       = 16
myisam_recover_options  = BACKUP
query_cache_limit       = 128M
query_cache_size        = 0
query_cache_type        = 0
performance_schema = OFF
log_error = /var/log/mysql/error.log
expire_logs_days        = 10
max_binlog_size   = 100M
character-set-server  = utf8mb4
collation-server      = utf8mb4_general_ci
[embedded]
[mariadb]
[mariadb-10.1]

[--] Skipped version check for MySQLTuner script
[OK] Logged in using credentials passed on the command line
[OK] Currently running supported MySQL version 10.1.34-MariaDB-0ubuntu0.18.04.1
[OK] Operating on 64-bit architecture
-------- Log file Recommendations ------------------------------------------------------------------
[--] Log file: /var/log/mysql/error.log(0B)
[OK] Log file /var/log/mysql/error.log exists
[OK] Log file /var/log/mysql/error.log is readable.
[!!] Log file /var/log/mysql/error.log is empty
[OK] Log file /var/log/mysql/error.log is smaller than 32 Mb
[OK] /var/log/mysql/error.log doesn't contain any warning.
[OK] /var/log/mysql/error.log doesn't contain any error.
[--] 0 start(s) detected in /var/log/mysql/error.log
[--] 0 shutdown(s) detected in /var/log/mysql/error.log
-------- Storage Engine Statistics -----------------------------------------------------------------
[--] Status: +Aria +CSV +InnoDB +MEMORY +MRG_MyISAM +MyISAM +PERFORMANCE_SCHEMA +SEQUENCE
[--] Data in InnoDB tables: 2.1M (Tables: 49)
[--] Data in MyISAM tables: 31.4G (Tables: 339)
[OK] Total fragmented tables: 0
-------- Analysis Performance Metrics --------------------------------------------------------------
[--] innodb_stats_on_metadata: OFF
[OK] No stat updates during querying INFORMATION_SCHEMA.
-------- Security Recommendations ------------------------------------------------------------------
[OK] There are no anonymous accounts for any database users
[OK] All database users have passwords assigned
[--] There are 618 basic passwords in the list.
-------- CVE Security Recommendations --------------------------------------------------------------
[OK] NO SECURITY CVE FOUND FOR YOUR VERSION
-------- Performance Metrics -----------------------------------------------------------------------
[--] Up for: 131d 22h 10m 38s (7B q [644.089 qps], 2M conn, TX: 1414G, RX: 556G)
[--] Reads / Writes: 96% / 4%
[--] Binary logging is disabled
[--] Physical Memory     : 62.7G
[--] Max MySQL memory    : 6.7G
[--] Other process memory: 989.5M
[--] Total buffers: 424.0M global + 128.8M per thread (50 max threads)
[--] P_S Max memory usage: 0B
[--] Galera GCache Max memory usage: 0B
[OK] Maximum reached memory usage: 3.6G (5.68% of installed RAM)
[OK] Maximum possible memory usage: 6.7G (10.69% of installed RAM)
[OK] Overall possible memory usage with other process is compatible with memory available
[OK] Slow queries: 0% (216/7B)
[OK] Highest usage of available connections: 50% (25/50)
[OK] Aborted connections: 2.03%  (52376/2580658)
[OK] Query cache is disabled by default due to mutex contention on multiprocessor machines.
[OK] Sorts requiring temporary tables: 0% (0 temp sorts / 3M sorts)
[OK] No joins without indexes
[!!] Temporary tables created on disk: 27% (83K on disk / 304K total)
[OK] Thread cache hit rate: 99% (667 created / 2M connections)
[!!] Table cache hit rate: 3% (606 open / 15K opened)
[OK] Open file limit used: 5% (874/16K)
[OK] Table locks acquired immediately: 99% (7B immediate / 7B 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: 8 thread(s).
[--] Using default value is good enough for your version (10.1.34-MariaDB-0ubuntu0.18.04.1)
-------- MyISAM Metrics ----------------------------------------------------------------------------
[OK] Key buffer used: 100.0% (134M used / 134M cache)
[OK] Key buffer size / total MyISAM indexes: 128.0M/9.2G
[OK] Read Key buffer hit rate: 99.9% (53B cached / 33M reads)
[!!] Write Key buffer hit rate: 50.0% (515M cached / 257M 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/2.1M
[!!] Ratio InnoDB log file size / InnoDB Buffer pool size (75 %): 48.0M * 2/128.0M should be equal 25%
[!!] InnoDB buffer pool <= 1G and Innodb_buffer_pool_instances(!=1).
[--] InnoDB Buffer Pool Chunk Size not used or defined in your version
[OK] InnoDB Read buffer efficiency: 99.27% (76133 hits/ 76689 total)
[!!] InnoDB Write Log efficiency: 14.75% (63 hits/ 427 total)
[OK] InnoDB log waits: 0.00% (0 waits / 364 writes)
-------- AriaDB Metrics ----------------------------------------------------------------------------
[--] AriaDB is enabled.
[OK] Aria pagecache size / total Aria indexes: 128.0M/1B
[OK] Aria pagecache hit rate: 99.9% (87M cached / 83K reads)
-------- TokuDB Metrics ----------------------------------------------------------------------------
[--] TokuDB is disabled.
-------- XtraDB Metrics ----------------------------------------------------------------------------
[--] XtraDB is disabled.
-------- Galera Metrics ----------------------------------------------------------------------------
[--] Galera is disabled.
-------- Replication Metrics -----------------------------------------------------------------------
[--] Galera Synchronous replication: NO
[--] No replication slave(s) for this server.
[--] Binlog format: STATEMENT
[--] XA support enabled: ON
[--] Semi synchronous replication Master: Not Activated
[--] Semi synchronous replication Slave: Not Activated
[--] This is a standalone server
-------- Recommendations ---------------------------------------------------------------------------
General recommendations:
    When making adjustments, make tmp_table_size/max_heap_table_size equal
    Reduce your SELECT DISTINCT queries which have no LIMIT clause
    Increase table_open_cache gradually to avoid file descriptor limits
    Read this before increasing table_open_cache over 64: http://bit.ly/1mi7c4C
    Read this before increasing for MariaDB https://mariadb.com/kb/en/library/optimizing-table_open_cache/
    This is MyISAM only table_cache scalability problem, InnoDB not affected.
    See more details here: https://bugs.mysql.com/bug.php?id=49177
    This bug already fixed in MySQL 5.7.9 and newer MySQL versions.
    Beware that open_files_limit (16364) variable
    should be greater than table_open_cache (2000)
    Performance schema should be activated for better diagnostics
    Consider installing Sys schema from https://github.com/mysql/mysql-sys
    Before changing innodb_log_file_size and/or innodb_log_files_in_group read this: http://bit.ly/2wgkDvS
Variables to adjust:
    tmp_table_size (> 256M)
    max_heap_table_size (> 16M)
    table_open_cache (> 2000)
    performance_schema = ON enable PFS
    innodb_log_file_size should be (=16M) if possible, so InnoDB total log files size equals to 25% of buffer pool size.
    innodb_buffer_pool_instances (=1)