Linux
MariaDB 10.3 CPU 使用率、伺服器性能建議
我的平台：
8 cores, CPU benchmark > 10k (Intel(R) Xeon(R) CPU E5-1620 v2 @ 3.70GHz) 32GB of RAM 2x 7200 SATA enterprise HDD, 128MB cache, each of them have physical 512b block size實際文件系統（md3 上的 /var）是 XFS（128GB），RAID 級別 0（條帶化），塊大小 64 kB：
xfs_資訊：
meta-data=/dev/md3 isize=256 agcount=16, agsize=2097024 blks = sectsz=512 attr=2, projid32bit=1 = crc=0 finobt=0 spinodes=0 data = bsize=4096 blocks=33552384, imaxpct=25 = sunit=128 swidth=256 blks naming =version 2 bsize=4096 ascii-ci=0 ftype=0 log =internal bsize=4096 blocks=16384, version=2 = sectsz=512 sunit=8 blks, lazy-count=1 realtime =none extsz=4096 blocks=0, rtextents=0伺服器是Apache+nginx+redis+Mariadb混合
/var 分區專用於數據庫，靠近磁碟中心：
Filesystem Size Used Avail Use% Mounted on /dev/md2 16G 6.1G 10G 38% / /dev/md3 128G 14G 115G 11% /var /dev/md0 32G 34M 32G 1% /tmp /dev/md5 3.5T 3.1T 372G 90% /home /dev/md2 on / type xfs (rw,noatime,nodiratime,nobarrier,attr2,inode64,usrquota,grpquota) [/] /dev/md3 on /var type xfs (rw,noatime,nodiratime,nobarrier,attr2,inode64,sunit=1024,swidth=2048,usrquota,grpquota) [/var] /dev/md0 on /tmp type xfs (rw,noexec,noatime,nobarrier,nodiratime,attr2,inode64,sunit=1024,swidth=2048,usrquota,grpquota) /dev/md5 on /home type xfs (rw,noatime,nodiratime,nobarrier,attr2,inode64,sunit=1024,swidth=2048,usrquota,grpquota) [/home]目前 InnoDB 的數據大小正在從 3-4GB 躍升。
我期待添加額外的 ~8GB InnoDB 數據，MyISAM 2-3GB，Aria ~<2GB。似乎 Mariadb 10.2 到 10.3 升級後，db 開始吃越來越多的 cpu，一些 DB 響應達到 4-5 秒。數據庫慢日誌目前沒有捕捉到任何東西。
我想在不添加 SSD 或額外記憶體的情況下為將來的系統做好準備。有 Redis 服務，但我無法記憶體 100% 的數據庫查詢。Redis 已經在處理約 550 個請求/秒。
我正在考慮更改 innodb_page_size 值（innodb_page_size 現在有 16k 預設選項），是否可以在不導出+導入數據的情況下做到這一點？值得嗎？我的系統有更好的選擇嗎？在不更改硬體的情況下進行系統重置有什麼建議嗎？速度變慢是因為 90% 的 /home 分區嗎？磁碟頭必須到Web文件的末尾磁碟並返回開頭？RAID磁碟塊大小從64k增加/減少？
iostat：
avg-cpu: %user %nice %system %iowait %steal %idle 53.68 17.72 4.94 0.84 0.00 22.81 Device: tps kB_read/s kB_wrtn/s kB_read kB_wrtn sda 44.93 954.33 359.22 131137332 49362235 sdb 42.35 948.70 352.07 130364493 48378490 md2 0.64 9.86 2.63 1354830 361356 md3 51.90 118.53 668.17 16287740 91814945 md0 0.41 3.04 17.59 418198 2416612 md5 22.25 1743.19 19.57 239537550 2689559我目前的數據庫設置如下所示：
[mysql] port = 3306 socket = /var/lib/mysql/mysql.sock [mysqld] server_id = 1 default_time_zone = America/Toronto user = mysql default-storage-engine = InnoDB socket = /var/lib/mysql/mysql.sock pid-file = /var/lib/mysql/mysql.pid character-set-server = utf8 collation-server = utf8_bin tmpdir = /tmp event-scheduler = ON performance_schema = ON query_response_time_stats = ON slave-net-timeout = 360 net_write_timeout = 120 # MyISAM # key-buffer-size = 1024M myisam-recover-options = FORCE,BACKUP myisam_sort_buffer_size = 8M #128M is default on Mariadb 10.3; range 4096-18446744073709547520; aria_pagecache_buffer_size = 512M max-allowed-packet = 16M max-connect-errors = 1000000 skip-name-resolve bind-address = 127.0.0.1 sql-mode = STRICT_TRANS_TABLES,ERROR_FOR_DIVISION_BY_ZERO,NO_AUTO_CREATE_USER,NO_AUTO_VALUE_ON_ZERO,NO_ENGINE_SUBSTITUTION,NO_ZERO_DATE,NO_ZERO_IN_DATE,ONLY_FULL_GROUP_BY sysdate-is-now = 1 innodb = FORCE innodb-strict-mode = 1 # DATA STORAGE # datadir = /var/lib/mysql/ # BINARY LOGGING # log-bin = /var/log/mariadb/server-id-1-mysql-bin expire-logs-days = 14 #0 is default for Mariadb 10.3; range 0-99; sync-binlog = 600 #0 is default on Mariadb 10.3; 0 = OS depend; 1 = one write per commit/statement; # CACHES AND LIMITS # tmp-table-size = 1G max-heap-table-size = 1G query-cache-type = 2 # 0=disabled, 1=enabled, 2=on demand query-cache-size = 64M #1M is default on Mariadb 10.3 query_cache_limit = 1M #1m is default on Mariadb 10.3 query_cache_min_res_unit = 512 #512 is default on Mariadb 10.3 max-connections = 128 thread-cache-size = 128 #128 is default on Mariadb 10.3 open-files-limit = 32768 #16k is default on Mariadb 10.3 table-definition-cache = 512 #400 is default on Mariadb 10.3 table-open-cache = 4096 #2000 is default on Mariadb 10.3 join_buffer_size = 1M #256K is default on Mariadb 10.3 sort_buffer_size = 2M #2M is default on Mariadb 10.3 thread_cache_size = 128 # 128 is default on Mariadb 10.3; recommended 100 - ((show status like Threads_created / show status like Connections) * 100) thread_concurrency = 10 # 10 is default on Mariadb 10.3 # INNODB # ### #performance increase, but very dangerous skip-innodb-doublewrite #default if off on Mariadb 10.3 innodb-checksum-algorithm = none #crc32 is default on Mariadb 10.3 innodb-compression-level = 0 #6 is default on Mariadb 10.3 ### #innodb-log-block-size = 4096 #512 is default on Mariadb 10.3; recommended by disk aligment (blockdev --getbsz /dev/sdXX) #innodb_page_size = 4096 #16K is default on Mariadb 10.3; range (4k or 4096, 8k or 8192, 16k or 16384; Mariadb > 10.1 can be up also 32k/64k); ATTENTION - InnoDB DATA EXPORTl+DROP+IMPORT REQUIRED innodb-defragment = 1 innodb-flush-method = O_DIRECT innodb-log-files-in-group = 2 innodb-log-file-size = 512M # recommended = innodb-buffer-poolsize / 4 innodb_log_buffer_size = 64M #16M is default on Mariadb 10.3 innodb-flush-log-at-trx-commit = 0 #0 = best performance, 1 = best durability, 2 = better performance innodb_flush_log_at_timeout = 1 #1 is default on Mariadb 10.3 innodb-file-per-table = 1 #1 is default for Mariadb 10.3 innodb-buffer-pool-size = 4G # recommended = >total size of InnoDB data innodb_buffer_pool_instances = 4 # recommended = RAM chips count; innodb_thread_concurrency = 0 #0 is default on Mariadb 10.3 innodb_flush_log_at_timeout = 1 #1 is default on Mariadb 10.3 innodb_sort_buffer_size = 1M #1M is default on 10.3 Mariadb innodb_read_io_threads = 4 #4 is default on Mariadb 10.3 innodb_write_io_threads = 4 #4 is default om Mariadb 10.3 # LOGGING # long_query_time = 2 log-error = /var/log/mariadb/mariadb-error.log log-queries-not-using-indexes slow-query-log ####filter options: admin,filesort,filesort_on_disk,full_join,full_scan,query_cache,query_cache_miss,tmp_table,tmp_table_on_disk log-slow-filter = admin,full_join,filesort_on_disk,tmp_table,tmp_table_on_disk log_slow_verbosity = innodb,query_plan,explain log_slow_rate_limit = 100 #1 is default on Mariadb 10.3 slow-query-log-file = /var/log/mariadb/mariadb-slow.log最佳：
top - 11:00:37 up 1 day, 14:08, 2 users, load average: 6.69, 6.50, 6.98 Tasks: 372 total, 11 running, 358 sleeping, 0 stopped, 3 zombie %Cpu0 : 57.0 us, 9.7 sy, 21.0 ni, 9.3 id, 0.3 wa, 0.0 hi, 2.7 si, 0.0 st %Cpu1 : 41.9 us, 7.0 sy, 40.5 ni, 10.3 id, 0.3 wa, 0.0 hi, 0.0 si, 0.0 st %Cpu2 : 60.1 us, 4.3 sy, 24.9 ni, 10.6 id, 0.0 wa, 0.0 hi, 0.0 si, 0.0 st %Cpu3 : 67.4 us, 8.0 sy, 17.6 ni, 7.0 id, 0.0 wa, 0.0 hi, 0.0 si, 0.0 st %Cpu4 : 96.0 us, 0.7 sy, 3.0 ni, 0.3 id, 0.0 wa, 0.0 hi, 0.0 si, 0.0 st %Cpu5 : 77.4 us, 4.0 sy, 18.6 ni, 0.0 id, 0.0 wa, 0.0 hi, 0.0 si, 0.0 st %Cpu6 : 77.7 us, 2.3 sy, 19.9 ni, 0.0 id, 0.0 wa, 0.0 hi, 0.0 si, 0.0 st %Cpu7 : 96.7 us, 1.3 sy, 1.7 ni, 0.3 id, 0.0 wa, 0.0 hi, 0.0 si, 0.0 st KiB Mem : 32746416 total, 755700 free, 8179264 used, 23811452 buff/cache KiB Swap: 0 total, 0 free, 0 used. 22176368 avail Mem PID USER PR NI VIRT RES SHR S %CPU %MEM TIME+ COMMAND 653 mysql 20 0 9890372 2.8g 15288 S 574.1 9.0 756:18.11 mysqld 29788 user2 25 5 447196 68176 48376 S 21.6 0.2 0:00.65 php70-cgi 29790 user2 25 5 447196 68280 48404 S 21.6 0.2 0:00.65 php70-cgi 29807 user2 25 5 442972 63084 45284 R 17.3 0.2 0:00.52 php70-cgi 29811 user2 25 5 442904 56644 40128 R 12.3 0.2 0:00.37 php70-cgi 1137 user1 20 0 876800 83452 5900 S 8.0 0.3 1:56.75 php-fpm 29815 user1 25 5 442536 31244 11192 R 8.0 0.1 0:00.24 php72-cgi 29813 user1 25 5 437760 26280 11008 R 5.0 0.1 0:00.15 php72-cgi 29817 user2 25 5 436752 41688 30368 R 4.0 0.1 0:00.12 php70-cgi 18803 netdata 20 0 15648 4856 912 R 1.0 0.0 3:23.39 apps.plugin 29795 user1 25 5 430876 19464 11052 S 1.0 0.1 0:00.03 php72-cgi 29799 user1 25 5 430876 19288 10880 S 1.0 0.1 0:00.03 php72-cgi 29818 user1 25 5 430876 19464 11052 R 1.0 0.1 0:00.03 php72-cgi 29819 user1 25 5 430876 19344 10912 R 1.0 0.1 0:00.03 php72-cgi 842 nginx 20 0 47744 4468 2376 S 0.7 0.0 0:08.39 nginx 5511 root 20 0 728880 49836 48040 S 0.7 0.2 0:23.29 rsyslogd 5804 netdata 20 0 270380 28012 5560 S 0.7 0.1 21:09.58 python 27760 netdata 20 0 9688 1536 1220 S 0.7 0.0 0:00.14 bash 490 root 20 0 122064 67104 66668 S 0.3 0.2 6:54.47 systemd-journal 843 nginx 20 0 47988 4700 2388 S 0.3 0.0 0:13.04 nginx 848 nginx 20 0 48692 5420 2380 S 0.3 0.0 0:40.13 nginx 936 user1 20 0 751612 14992 2824 S 0.3 0.0 0:02.90 php-fpm 1006 user1 20 0 863532 71616 6964 S 0.3 0.2 1:59.43 php-fpm 1205 redis 10 -10 1806528 1.5g 1184 S 0.3 4.9 15:36.72 redis 3819 user1 20 0 751480 14840 2752 S 0.3 0.0 0:00.60 php-fpm 5569 netdata 20 0 234140 66072 1688 S 0.3 0.2 8:13.37 netdata 18784 user1 20 0 893804 101080 6264 S 0.3 0.3 1:47.93 php-fpm 24478 apache 25 5 824688 19604 4072 S 0.3 0.1 0:00.21 httpd 24938 apache 25 5 824596 19408 3952 S 0.3 0.1 0:00.17 httpd 29529 root 20 0 162248 2616 1600 R 0.3 0.0 0:00.09 top 29821 user2 25 5 302320 12804 8356 R 0.3 0.0 0:00.01 php70-cgi ...我的頂：
MySQL on localhost (10.3.9-MariaDB-log) up 0+04:30:25 [10:59:02] Queries: 893.2k qps: 56 Slow: 3.0 Se/In/Up/De(%): 63/00/05/00 qps now: 112 Slow qps: 0.0 Threads: 3 ( 8/ 22) 73/00/04/00 Key Efficiency: 100.0% Bps in/out: 8.8k/114.7k Now in/out: 11.5k/70.2k Id User Host/IP DB Time Cmd Query or State -- ---- ------- -- ---- --- ---------- 1 system us 0 Daemon InnoDB purge coordinator 2 system us 0 Daemon InnoDB purge worker 3 system us 0 Daemon InnoDB purge worker 4 system us 0 Daemon InnoDB purge worker 5 system us 0 Daemon InnoDB shutdown handler 64 netdata localhost 0 Sleep 49426 root localhost mysql 0 Query show full processlist 7 event_sch localhost 7000 Daemon Waiting on empty queuemysql調諧器：
>> MySQLTuner 1.7.10 - Major Hayden <major@mhtx.net> >> 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] Currently running supported MySQL version 10.3.9-MariaDB-log [OK] Operating on 64-bit architecture -------- Log file Recommendations ------------------------------------------------------------------ [--] Log file: /var/log/mariadb/mariadb-error.log(9K) [OK] Log file /var/log/mariadb/mariadb-error.log exists [OK] Log file /var/log/mariadb/mariadb-error.log is readable. [OK] Log file /var/log/mariadb/mariadb-error.log is not empty [OK] Log file /var/log/mariadb/mariadb-error.log is smaller than 32 Mb [OK] /var/log/mariadb/mariadb-error.log doesn't contain any error. -------- Storage Engine Statistics ----------------------------------------------------------------- [--] Status: +Aria +CSV +InnoDB +MEMORY +MRG_MyISAM +MyISAM +PERFORMANCE_SCHEMA +SEQUENCE [--] Data in Aria tables: 11.3M (Tables: 6) [--] Data in MyISAM tables: 334.7M (Tables: 593) [--] Data in InnoDB tables: 3.1G (Tables: 663) [--] Data in MEMORY tables: 124.1K (Tables: 6) [OK] Total fragmented tables: 0 -------- Security Recommendations ------------------------------------------------------------------ [OK] There are no anonymous accounts for any database users [OK] All database users have passwords assigned -------- CVE Security Recommendations -------------------------------------------------------------- [--] Skipped due to --cvefile option undefined -------- Performance Metrics ----------------------------------------------------------------------- [--] Up for: 4h 25m 12s (893K q [56.160 qps], 113K conn, TX: 1G, RX: 136M) [--] Reads / Writes: 91% / 9% [--] Binary logging is enabled (GTID MODE: OFF) [--] Physical Memory : 31.2G [--] Max MySQL memory : 7.1G [--] Other process memory: 3.9G [--] Total buffers: 6.6G global + 3.7M per thread (128 max threads) [--] P_S Max memory usage: 100M [--] Galera GCache Max memory usage: 0B [OK] Maximum reached memory usage: 6.8G (21.66% of installed RAM) [OK] Maximum possible memory usage: 7.1G (22.84% of installed RAM) [OK] Overall possible memory usage with other process is compatible with memory available [OK] Slow queries: 0% (3/893K) [OK] Highest usage of available connections: 19% (25/128) [OK] Aborted connections: 0.00% (2/113504) [!!] Query cache may be disabled by default due to mutex contention. [!!] Query cache efficiency: 0.0% (0 cached / 562K selects) [OK] Query cache prunes per day: 0 [OK] Sorts requiring temporary tables: 0% (0 temp sorts / 115K sorts) [!!] Joins performed without indexes: 194 [OK] Temporary tables created on disk: 15% (12K on disk / 80K total) [OK] Thread cache hit rate: 99% (25 created / 113K connections) [OK] Table cache hit rate: 98% (1K open / 1K opened) [OK] Open file limit used: 7% (1K/16K) [OK] Table locks acquired immediately: 99% (330K immediate / 330K locks) [OK] Binlog cache memory access: 100.00% (42935 Memory / 42935 Total) -------- Performance schema ------------------------------------------------------------------------ [--] Memory used by P_S: 100.3M [--] 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 (10.3.9-MariaDB-log) -------- MyISAM Metrics ---------------------------------------------------------------------------- [!!] Key buffer used: 18.9% (202M used / 1B cache) [OK] Key buffer size / total MyISAM indexes: 1.0G/81.9M [OK] Read Key buffer hit rate: 100.0% (115M cached / 6K reads) [!!] Write Key buffer hit rate: 77.2% (5K cached / 4K writes) -------- InnoDB Metrics ---------------------------------------------------------------------------- [--] InnoDB is enabled. [--] InnoDB Thread Concurrency: 0 [OK] InnoDB File per table is activated [OK] InnoDB buffer pool / data size: 4.0G/3.1G [OK] Ratio InnoDB log file size / InnoDB Buffer pool size: 512.0M * 2/4.0G should be equal 25% [OK] InnoDB buffer pool instances: 4 [--] Number of InnoDB Buffer Pool Chunk : 32 for 4 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% (39286543837 hits/ 39286642011 total) [!!] InnoDB Write Log efficiency: 76.58% (77174 hits/ 100771 total) [OK] InnoDB log waits: 0.00% (0 waits / 23597 writes) -------- AriaDB Metrics ---------------------------------------------------------------------------- [--] AriaDB is enabled. [OK] Aria pagecache size / total Aria indexes: 512.0M/808.0K [OK] Aria pagecache hit rate: 99.7% (3M cached / 11K reads) -------- Recommendations --------------------------------------------------------------------------- General recommendations: Control warning line(s) into /var/log/mariadb/mariadb-error.log file Restrict Host for user@% to user@SpecificDNSorIp MySQL was started within the last 24 hours - recommendations may be inaccurate Adjust your join queries to always utilize indexes 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 (> 1M, or use smaller result sets) join_buffer_size (> 1.0M, or always use indexes with JOINs)內部數據庫：
===================================== 2018-08-30 10:56:41 0x7fccb833c700 INNODB MONITOR OUTPUT ===================================== Per second averages calculated from the last 5 seconds ----------------- BACKGROUND THREAD ----------------- srv_master_thread loops: 14238 srv_active, 0 srv_shutdown, 1184 srv_idle srv_master_thread log flush and writes: 15422 ---------- SEMAPHORES ---------- OS WAIT ARRAY INFO: reservation count 186890 OS WAIT ARRAY INFO: signal count 9143467 RW-shared spins 0, rounds 31440402, OS waits 142956 RW-excl spins 0, rounds 13095374, OS waits 61503 RW-sx spins 2037, rounds 40312, OS waits 453 Spin rounds per wait: 31440402.00 RW-shared, 13095374.00 RW-excl, 19.79 RW-sx ------------ TRANSACTIONS ------------ Trx id counter 95899652 Purge done for trx's n:o < 95899643 undo n:o < 0 state: running but idle History list length 20 LIST OF TRANSACTIONS FOR EACH SESSION: ---TRANSACTION 421993893611928, not started 0 lock struct(s), heap size 1136, 0 row lock(s) ---TRANSACTION 421993893606216, not started 0 lock struct(s), heap size 1136, 0 row lock(s) -------- FILE I/O -------- I/O thread 0 state: waiting for completed aio requests (insert buffer thread) I/O thread 1 state: waiting for completed aio requests (log thread) I/O thread 2 state: waiting for completed aio requests (read thread) I/O thread 3 state: waiting for completed aio requests (read thread) I/O thread 4 state: waiting for completed aio requests (read thread) I/O thread 5 state: waiting for completed aio requests (read thread) I/O thread 6 state: waiting for completed aio requests (write thread) I/O thread 7 state: waiting for completed aio requests (write thread) I/O thread 8 state: waiting for completed aio requests (write thread) I/O thread 9 state: waiting for completed aio requests (write thread) Pending normal aio reads: [0, 0, 0, 0] , aio writes: [0, 0, 0, 0] , ibuf aio reads:, log i/o's:, sync i/o's: Pending flushes (fsync) log: 0; buffer pool: 0 99820 OS file reads, 433239 OS file writes, 130428 OS fsyncs 0.20 reads/s, 16384 avg bytes/read, 17.40 writes/s, 5.80 fsyncs/s ------------------------------------- INSERT BUFFER AND ADAPTIVE HASH INDEX ------------------------------------- Ibuf: size 1, free list len 270, seg size 272, 344 merges merged operations: insert 87, delete mark 267, delete 0 discarded operations: insert 0, delete mark 0, delete 0 Hash table size 1106407, node heap has 919 buffer(s) Hash table size 1106407, node heap has 1995 buffer(s) Hash table size 1106407, node heap has 4 buffer(s) Hash table size 1106407, node heap has 983 buffer(s) Hash table size 1106407, node heap has 919 buffer(s) Hash table size 1106407, node heap has 2357 buffer(s) Hash table size 1106407, node heap has 1394 buffer(s) Hash table size 1106407, node heap has 735 buffer(s) 378057.19 hash searches/s, 663309.94 non-hash searches/s --- LOG --- Log sequence number 58746155240 Log flushed up to 58746154730 Pages flushed up to 58746153668 Last checkpoint at 58746143988 0 pending log flushes, 0 pending chkp writes 27080 log i/o's done, 1.20 log i/o's/second ---------------------- BUFFER POOL AND MEMORY ---------------------- Total large memory allocated 4429185024 Dictionary memory allocated 4705071 Buffer pool size 262144 Free buffers 135207 Database pages 116025 Old database pages 42906 Modified db pages 16 Percent of dirty pages(LRU & free pages): 0.006 Max dirty pages percent: 75.000 Pending reads 0 Pending writes: LRU 0, flush list 0, single page 0 Pages made young 98, not young 0 0.00 youngs/s, 0.00 non-youngs/s Pages read 99142, created 16883, written 406172 0.20 reads/s, 0.00 creates/s, 16.20 writes/s Buffer pool hit rate 999 / 1000, young-making rate 0 / 1000 not 0 / 1000 Pages read ahead 0.00/s, evicted without access 0.00/s, Random read ahead 0.00/s LRU len: 116025, unzip_LRU len: 3216 I/O sum[0]:cur[0], unzip sum[0]:cur[0] ---------------------- INDIVIDUAL BUFFER POOL INFO ---------------------- ---BUFFER POOL 0 Buffer pool size 65536 Free buffers 33684 Database pages 29131 Old database pages 10773 Modified db pages 4 Percent of dirty pages(LRU & free pages): 0.006 Max dirty pages percent: 75.000 Pending reads 0 Pending writes: LRU 0, flush list 0, single page 0 Pages made young 31, not young 0 0.00 youngs/s, 0.00 non-youngs/s Pages read 24938, created 4193, written 123109 0.00 reads/s, 0.00 creates/s, 4.60 writes/s Buffer pool hit rate 1000 / 1000, young-making rate 0 / 1000 not 0 / 1000 Pages read ahead 0.00/s, evicted without access 0.00/s, Random read ahead 0.00/s LRU len: 29131, unzip_LRU len: 741 I/O sum[0]:cur[0], unzip sum[0]:cur[0] ---BUFFER POOL 1 Buffer pool size 65536 Free buffers 33601 Database pages 29203 Old database pages 10799 Modified db pages 3 Percent of dirty pages(LRU & free pages): 0.005 Max dirty pages percent: 75.000 Pending reads 0 Pending writes: LRU 0, flush list 0, single page 0 Pages made young 43, not young 0 0.00 youngs/s, 0.00 non-youngs/s Pages read 25078, created 4125, written 91633 0.00 reads/s, 0.00 creates/s, 1.80 writes/s Buffer pool hit rate 1000 / 1000, young-making rate 0 / 1000 not 0 / 1000 Pages read ahead 0.00/s, evicted without access 0.00/s, Random read ahead 0.00/s LRU len: 29203, unzip_LRU len: 815 I/O sum[0]:cur[0], unzip sum[0]:cur[0] ---BUFFER POOL 2 Buffer pool size 65536 Free buffers 33966 Database pages 28826 Old database pages 10660 Modified db pages 4 Percent of dirty pages(LRU & free pages): 0.006 Max dirty pages percent: 75.000 Pending reads 0 Pending writes: LRU 0, flush list 0, single page 0 Pages made young 20, not young 0 0.00 youngs/s, 0.00 non-youngs/s Pages read 24528, created 4298, written 74115 0.20 reads/s, 0.00 creates/s, 2.60 writes/s Buffer pool hit rate 999 / 1000, young-making rate 0 / 1000 not 0 / 1000 Pages read ahead 0.00/s, evicted without access 0.00/s, Random read ahead 0.00/s LRU len: 28826, unzip_LRU len: 807 I/O sum[0]:cur[0], unzip sum[0]:cur[0] ---BUFFER POOL 3 Buffer pool size 65536 Free buffers 33956 Database pages 28865 Old database pages 10674 Modified db pages 5 Percent of dirty pages(LRU & free pages): 0.008 Max dirty pages percent: 75.000 Pending reads 0 Pending writes: LRU 0, flush list 0, single page 0 Pages made young 4, not young 0 0.00 youngs/s, 0.00 non-youngs/s Pages read 24598, created 4267, written 117315 0.00 reads/s, 0.00 creates/s, 7.20 writes/s Buffer pool hit rate 1000 / 1000, young-making rate 0 / 1000 not 0 / 1000 Pages read ahead 0.00/s, evicted without access 0.00/s, Random read ahead 0.00/s LRU len: 28865, unzip_LRU len: 853 I/O sum[0]:cur[0], unzip sum[0]:cur[0] -------------- ROW OPERATIONS -------------- 0 queries inside InnoDB, 0 queries in queue 6 read views open inside InnoDB Process ID=653, Main thread ID=140512678807296, state: sleeping Number of rows inserted 816, updated 48716, deleted 818, read 17466709916 0.00 inserts/s, 1.60 updates/s, 0.00 deletes/s, 1058084.38 reads/s Number of system rows inserted 0, updated 0, deleted 0, read 0 0.00 inserts/s, 0.00 updates/s, 0.00 deletes/s, 0.00 reads/s ---------------------------- END OF INNODB MONITOR OUTPUT ============================
為您的 my.cnf 或 my.ini 考慮的建議
$$ mysqld $$部分（RPS = 每秒速率）
# 20180901 1346 from mysqlservertuning.com # log_error=/var/lib/mysql/2cd908c24352-error.log # from default of stderr, for log # max_connect_errors=10 # from 1000000 - why give a cracker/hacker more than 10 shots? # tmp_table_size=320M # from 1G to stay under 1% RAM # max_heap_table_size=320M # from 1G should be same as TTS # thread_cache_size=100 # from 128 for CAP suggested in V8 refman to avoid OOM # innodb_io_capacity=15000 # from 200 to allow more IOPS for your SSD # read_buffer_size=256K # from 128K to reduce handler_read_next RPS # read_rnd_buffer_size=128K # from 256K to reduce handler_read_rnd_next RPS # key_cache_age_threshold=3600 # from 300 seconds to delay AGE OUT and reduce key_reads RPS # innodb_buffer_pool_instances=1 # from 8 to minimize impact of innodb_lru_scan_depth on CPU every second # thread_concurrency=14 # from 10 to encourage multi processing when possible with your 8 cores # min_examined_row_limit=1 # from 0 to reduce slow query log clutter每天，將您目前的 my.cnf 或 my.ini 保存在 \history 中，並使用 DATED 定時文件名，例如 20180827hhmm-my.cnf，以便快速返回上一個工作 my.cnf 或 my.ini。
將此 BLOCK（包括開始日期和我們的網站名稱）複製到您的 END
$$ mysqld $$部分並每天啟用一次更改，方法是刪除前導 # 和空格字元，在繼續進行下一個更改之前進行監控。 禁用帶有前導 # 和空格鍵的 EARLIER 相同的 NAMED 變數，以避免混淆。5 年後，您仍將擁有 my.cnf 或 my.ini 更改的歷史記錄以及大致日期。
通常每天只更換一次，在進行下一次更換之前進行監控。如果更改似乎有害，請返回上一個工作 my.cnf 或 my.ini 並告訴我們。