run*_*nts 5 mysql performance memory outofmemoryerror oom-killer
我刚刚将我所有的网站都移到了具有 4GB RAM 的新服务器上。几乎立即，mysql 开始崩溃，并且有一次没有重新启动，这导致了一次重大中断（因为我没有注意到，直到有人向我指出）。
这是删除 CRON 作业的日志：http : //pastebin.com/9SAUBcFp（apache2 调用了 oom-killer、内存不足错误等）
在没有df -h超过4％的使用率。
这是 free -m 的输出
total used free shared buffers cached
Mem: 4002 2090 1911 0 168 1015
-/+ buffers/cache: 906 3095
Swap: 255 8 247
这是 mysqlreport 的输出
__ Key _________________________________________________________________
Buffer used 849.00k of 16.00M %Used: 5.18
Current 2.99M %Usage: 18.71
Write hit 44.87%
Read hit 98.84%
__ Questions ___________________________________________________________
Total 198.55k 33.8/s
QC Hits 147.94k 25.1/s %Total: 74.51
DMS 31.35k 5.3/s 15.79
Com_ 14.20k 2.4/s 7.15
COM_QUIT 5.07k 0.9/s 2.55
-Unknown 9 0.0/s 0.00
Slow 2 s 0 0/s 0.00 %DMS: 0.00 Log: ON
DMS 31.35k 5.3/s 15.79
SELECT 27.65k 4.7/s 13.93 88.19
UPDATE 1.78k 0.3/s 0.89 5.66
INSERT 1.73k 0.3/s 0.87 5.51
DELETE 199 0.0/s 0.10 0.63
REPLACE 0 0/s 0.00 0.00
Com_ 14.20k 2.4/s 7.15
set_option 9.29k 1.6/s 4.68
change_db 4.63k 0.8/s 2.33
show_tables 260 0.0/s 0.13
__ SELECT and Sort _____________________________________________________
Scan 850 0.1/s %SELECT: 3.07
Range 398 0.1/s 1.44
Full join 0 0/s 0.00
Range check 0 0/s 0.00
Full rng join 0 0/s 0.00
Sort scan 1.01k 0.2/s
Sort range 361 0.1/s
Sort mrg pass 0 0/s
__ Query Cache _________________________________________________________
Memory usage 15.09M of 16.00M %Used: 94.30
Block Fragmnt 2.31%
Hits 147.94k 25.1/s
Inserts 21.70k 3.7/s
Insrt:Prune 2.86:1 2.4/s
Hit:Insert 6.82:1
__ Table Locks _________________________________________________________
Waited 0 0/s %Total: 0.00
Immediate 35.51k 6.0/s
__ Tables ______________________________________________________________
Open 400 of 400 %Cache: 100.00
Opened 5.55k 0.9/s
__ Connections _________________________________________________________
Max used 9 of 151 %Max: 5.96
Total 5.07k 0.9/s
__ Created Temp ________________________________________________________
Disk table 554 0.1/s
Table 1.61k 0.3/s Size: 16.0M
File 6 0.0/s
__ Threads _____________________________________________________________
Running 1 of 1
Cached 7 of 8 %Hit: 99.82
Created 9 0.0/s
Slow 0 0/s
__ Aborted _____________________________________________________________
Clients 0 0/s
Connects 5 0.0/s
__ Bytes _______________________________________________________________
Sent 3.57G 607.2k/s
Received 34.01M 5.8k/s
__ InnoDB Buffer Pool __________________________________________________
Usage 98.28M of 127.98M %Used: 76.79
Read hit 99.98%
Pages
Free 1.90k %Total: 23.21
Data 5.61k 68.50 %Drty: 0.00
Misc 679 8.29
Latched 0 0.00
Reads 21.60M 3.7k/s
From file 4.62k 0.8/s 0.02
Ahead Rnd 0 0/s
Ahead Sql 0/s
Writes 10.83k 1.8/s
Flushes 5.27k 0.9/s
Wait Free 0 0/s
__ InnoDB Lock _________________________________________________________
Waits 0 0/s
Current 0
Time acquiring
Total 0 ms
Average 0 ms
Max 0 ms
__ InnoDB Data, Pages, Rows ____________________________________________
Data
Reads 5.57k 0.9/s
Writes 7.95k 1.4/s
fsync 3.10k 0.5/s
Pending
Reads 0
Writes 0
fsync 0
Pages
Created 48 0.0/s
Read 5.56k 0.9/s
Written 5.27k 0.9/s
Rows
Deleted 190 0.0/s
Inserted 242 0.0/s
Read 7.47M 1.3k/s
Updated 1.36k 0.2/s
这是 mysqltuner 的输出
-------- General Statistics --------------------------------------------------
[--] Skipped version check for MySQLTuner script
[OK] Currently running supported MySQL version 5.5.35-0+wheezy1-log
[OK] Operating on 64-bit architecture
-------- Storage Engine Statistics -------------------------------------------
[--] Status: +Archive -BDB -Federated +InnoDB -ISAM -NDBCluster
[--] Data in MyISAM tables: 1005M (Tables: 335)
[--] Data in InnoDB tables: 143M (Tables: 68)
[--] Data in PERFORMANCE_SCHEMA tables: 0B (Tables: 17)
[!!] Total fragmented tables: 76
-------- Security Recommendations -------------------------------------------
[OK] All database users have passwords assigned
-------- Performance Metrics -------------------------------------------------
[--] Up for: 1h 28m 55s (154K q [28.899 qps], 4K conn, TX: 3B, RX: 25M)
[--] Reads / Writes: 83% / 17%
[--] Total buffers: 192.0M global + 2.7M per thread (151 max threads)
[OK] Maximum possible memory usage: 597.8M (14% of installed RAM)
[OK] Slow queries: 0% (0/154K)
[OK] Highest usage of available connections: 5% (9/151)
[OK] Key buffer size / total MyISAM indexes: 16.0M/264.4M
[OK] Key buffer hit rate: 98.8% (77K cached / 912 reads)
[OK] Query cache efficiency: 87.2% (116K cached / 133K selects)
[!!] Query cache prunes per day: 5182
[OK] Sorts requiring temporary tables: 0% (0 temp sorts / 1K sorts)
[OK] Temporary tables created on disk: 24% (427 on disk / 1K total)
[OK] Thread cache hit rate: 99% (9 created / 4K connections)
[!!] Table cache hit rate: 9% (400 open / 4K opened)
[OK] Open file limit used: 61% (631/1K)
[OK] Table locks acquired immediately: 100% (18K immediate / 18K locks)
[!!] InnoDB data size / buffer pool: 143.3M/128.0M
-------- Recommendations -----------------------------------------------------
General recommendations:
Run OPTIMIZE TABLE to defragment tables for better performance
MySQL started within last 24 hours - recommendations may be inaccurate
Increase table_cache gradually to avoid file descriptor limits
Variables to adjust:
query_cache_size (> 16M)
table_cache (> 400)
innodb_buffer_pool_size (>= 143M)
鉴于上面的“要调整的变量”，我对 /etc/mysqld/my.cnf 进行了以下更改：
key_buffer_size = 280Minnodb_buffer_pool_size = 150Mtable_cache并将其更改为 100（我会不断增加，直到超过 400）query_cache_size从 16M更改为 32M这里有没有我忽略的明显问题或我应该做的任何事情？
添加更多内存似乎是合乎逻辑的结论。
顺便说一句，您从未提及是否将您的网站从多台不同的计算机整合到一台计算机上，或者所有网站都在一台旧服务器上运行（有多少内存）。这些信息将非常有帮助，但我仍然认为您只是需要更多内存。
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