mysql线上常见故障剖析.pdf

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谢谢大家Summary? 了解系统各个部件的工作原理– MySQL和 InnoDB– SQL和索引– OS 进程、线程、内存– IO、文件操作– 硬件的能力(响应时间、吞度量)? 数据采集和观测– 熟悉工具– 收集各个部件的数据，数据的采集和保存– 汇总，对比，分析– 重视 证据? 问题的解决– 应用层优化(设计、 SQL优化、索引调整 )– 参数调整( MySQL, OS)– patchpstack典型的调用栈#0 0x000000321220d174 in __lll_lock_wait () from /lib64/libpthread.so.0#1 0x0000003212208b00 in _L_lock_1233 () from /lib64/libpthread.so.0#2 0x0000003212208a83 in pthread_mutex_lock () from /lib64/libpthread.so.0#3 0x00000000008889db in key_cache_read ()#4 0x000000000083fe28 in _mi_fetch_keypage ()#5 0x000000000083efa1 in _mi_search ()#6 0x000000000083f14d in _mi_search ()#7 0x000000000083f692 in _mi_search_next ()#8 0x000000000083bbf0 in mi_rnext ()#9 0x00000000008332b5 in ha_myisam::index_next ()#10 0x00000000006393eb in join_read_next ()#11 0x00000000006243ba in sub_select ()#12 0x0000000000636e2d in do_select ()#13 0x00000000006442f7 in JOIN::exec ()#14 0x0000000000645ff8 in mysql_select ()#15 0x00000000006469a7 in handle_select ()Oprofile mysqldCPU: CPU with timer interrupt, speed 0 MHz (estimated)Profiling through timer interruptsamples % linenr info symbol name27363 14.8909 mf_keycache.c:1666 find_key_block25902 14.0958 my_handler.c:124 ha_key_cmp25624 13.9445 mf_keycache.c:2542 key_cache_read22179 12.0697 bmove512.c:40 bmove51221092 11.4782 mf_keycache.c:1349 unreg_request14228 7.7428 mi_search.c:184 _mi_bin_search4927 2.6813 mi_search.c:64 _mi_search4069 2.2143 mi_key.c:220 _mi_pack_key4046 2.2018 sql_select.cc:11896 join_read_key(st_join_table*)3116 1.6957 sql_select.cc:11345 sub_select(JOIN*, st_join_table*, bool)2995 1.6299 sql_select.cc:11413 evaluate_join

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