mysqlReport分析报告二
关于innodb_flush_log_at_trx_commit这个参数默认是1，分析报告一时，我已经修改为2。但是百万级的数据量I/O吞吐量还是大。
0 代表日志只大约每秒写入日志文件并且日志文件刷新到磁盘; 1 为执行完没执行一条SQL马上commit; 2 代表日志写入日志文件在每次提交后,但是日志文件只有大约每秒才会刷新到磁盘上. 对速度影响比较大，同时也关系数据完整性
innodb_flush_log_at_trx_commit=0
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虽然这个会在服务器宕机后，丢失数据。但是性能非常可观。
__ Key _________________________________________________________________ Buffer used 2.00k of 155.00M %Used: 0.00 Current 20.01M %Usage: 12.91 Write hit 0.00% Read hit 83.33% __ Questions ___________________________________________________________ Total 45.30k 76.4/s DMS 42.67k 72.0/s %Total: 94.19 QC Hits 2.20k 3.7/s 4.85 Com_ 424 0.7/s 0.94 COM_QUIT 28 0.0/s 0.06 -Unknown 17 0.0/s 0.04 Slow 5 s 3 0.0/s 0.01 %DMS: 0.01 Log: ON DMS 42.67k 72.0/s 94.19 SELECT 37.61k 63.4/s 83.02 88.14 UPDATE 4.16k 7.0/s 9.18 9.75 DELETE 896 1.5/s 1.98 2.10 INSERT 4 0.0/s 0.01 0.01 REPLACE 0 0/s 0.00 0.00 Com_ 424 0.7/s 0.94 show_fields 259 0.4/s 0.57 set_option 68 0.1/s 0.15 show_create 31 0.1/s 0.07 __ SELECT and Sort _____________________________________________________ Scan 367 0.6/s %SELECT: 0.98 Range 263 0.4/s 0.70 Full join 0 0/s 0.00 Range check 0 0/s 0.00 Full rng join 0 0/s 0.00 Sort scan 16 0.0/s Sort range 2 0.0/s Sort mrg pass 9 0.0/s __ Query Cache _________________________________________________________ Memory usage 332.55k of 99.00M %Used: 0.33 Block Fragmnt 9.97% Hits 2.20k 3.7/s Inserts 7.77k 13.1/s Insrt:Prune 7.77k:1 13.1/s Hit:Insert 0.28:1 __ Table Locks _________________________________________________________ Waited 0 0/s %Total: 0.00 Immediate 12.94k 21.8/s __ Tables ______________________________________________________________ Open 66 of 512 %Cache: 12.89 Opened 73 0.1/s __ Connections _________________________________________________________ Max used 11 of 1024 %Max: 1.07 Total 31 0.1/s __ Created Temp ________________________________________________________ Disk table 273 0.5/s Table 333 0.6/s Size: 103.0M File 23 0.0/s __ Threads _____________________________________________________________ Running 4 of 11 Cached 0 of 8 %Hit: 64.52 Created 11 0.0/s Slow 0 0/s __ Aborted _____________________________________________________________ Clients 1 0.0/s Connects 0 0/s __ Bytes _______________________________________________________________ Sent 4.66M 7.9k/s Received 2.33M 3.9k/s __ InnoDB Buffer Pool __________________________________________________ Usage 305.00M of 1.00G %Used: 29.79 Read hit 98.81% Pages Free 46.02k %Total: 70.21 Data 19.41k 29.61 %Drty: 1.59 Misc 114 0.17 Latched 0.00 Reads 1.54M 2.6k/s From file 18.42k 31.1/s 1.19 Ahead Rnd 0/s Ahead Sql 0/s Writes 26.52k 44.7/s Flushes 16.98k 28.6/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 19.33k 32.6/s Writes 9.25k 15.6/s fsync 805 1.4/s Pending Reads 0 Writes 0 fsync 0 Pages Created 84 0.1/s Read 19.32k 32.6/s Written 8.49k 14.3/s Rows Deleted 0 0/s Inserted 4 0.0/s Read 3.16M 5.3k/s Updated 4.16k 7.0/s
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