网站开发课程的心得,国外素材网站推荐,百度网站关键字搜索怎么做,wordpress显示图片最近某人社局核心数据库上了OB#xff0c;经常出现性能问题 某人社与我司合作多年#xff0c;非常信任我司在数据库的专业能力#xff0c;邀请我司过去看看能否提供帮助 与OB驻场工程师合作#xff0c;抓取了一天的TOP SQL#xff0c;跑得慢的SQL有几十条(注意只是某一天的…最近某人社局核心数据库上了OB经常出现性能问题 某人社与我司合作多年非常信任我司在数据库的专业能力邀请我司过去看看能否提供帮助 与OB驻场工程师合作抓取了一天的TOP SQL跑得慢的SQL有几十条(注意只是某一天的TOP SQL) 大致分析了一下有缺索引的有执行计划走错的有SQL写法有问题的有字段类型设计错误的也有表分区策略设计有问题的 这些问题在我看来都很简单就不贴在博客了下面我要分享一个对于OB SQL优化很有启发意义的案例
下面SQL每天要运行20w次平均每次执行0.5s到2秒它耗费了整个OB集群20%的CPU资源 也许有人会说不就才20w次吗我见过运行几百万次上千万次的SQL 这里我要说的是请不要拿国产数据库与Oracle对比Oracle发展了40年了国产数据库才发展多少年能替换O已经很厉害了 每天运行20w次的时段大致在早上9:30分到11:30分以及下午230到5:00也就是工作日业务办理时间
SQL代码大致如下(只贴一条还有很多类似SQL就不贴了)
SELECT * FROM AC08 WHERE (AAC001 ? AND AAE140 ? AND AAE792 IN (?,?) AND NOT EXISTS (SELECT ? FROM AC08 B WHERE AC08.AAZ686 B.AAZ686 AND B.AAE792 IN (?)))AC08是个超级大表它有26亿条数据根据AAC001 进行的HASH分区执行计划如下 |ID|OPERATOR |NAME |EST. ROWS|COST|
-----------------------------------------------------------------------
|0 |NESTED-LOOP ANTI JOIN | |0 |337 |
|1 | PX COORDINATOR | |1 |302 |
|2 | EXCHANGE OUT DISTR |:EX10000 |1 |294 |
|3 | TABLE SCAN |AC08(IDX_AC08EES_AAC001) |1 |294 |
|4 | PX COORDINATOR | |1 |46 |
|5 | EXCHANGE OUT DISTR |:EX20000 |1 |46 |
|6 | SUBPLAN SCAN |VIEW1 |1 |46 |
|7 | PX PARTITION ITERATOR| |1 |46 |
|8 | TABLE SCAN |B(IDX_AC08_AAZ686_AAE792)|1 |46 |
Outputs filters:
-------------------------------------0 - output([AC08.AAZ648], [AC08.AAZ223], [AC08.AAZ686], [AC08.AAC001], [AC08.AAZ159], [AC08.AAZ061], [AC08.AAB001], [AC08.AAB365], [AC08.AAE140], [AC08.AAE002], [AC08.AAE003], [AC08.AAA115], [AC08.AAE793], [AC08.AAE794], [AC08.AAA093], [AC08.AAC066], [AC08.AAC313], [AC08.AAC314], [AC08.AAE737], [AC08.AAB019], [AC08.AAB033], [AC08.AAE745], [AC08.AAC028], [AC08.AAC040], [AC08.AAB121], [AC08.AAE180], [AC08.AAE795], [AC08.AAE871], [AC08.AAE020], [AC08.AAE021], [AC08.AAE022], [AC08.AAE023], [AC08.AAE784], [AC08.AAE785], [AC08.AAE786], [AC08.AAE787], [AC08.AAE836], [AC08.AAE837], [AC08.AAE838], [AC08.AAE839], [AC08.AAE056], [AC08.AAE887], [AC08.AAE026], [AC08.AAE828], [AC08.AIC380], [AC08.AAE834], [AC08.AAE845], [AC08.AAE844], [AC08.AAB191], [AC08.AAE080], [AC08.AAE081], [AC08.AAE082], [AC08.AAE083], [AC08.AAE788], [AC08.AAE789], [AC08.AAE790], [AC08.AAE791], [AC08.AAE840], [AC08.AAE841], [AC08.AAE842], [AC08.AAE843], [AC08.AAE057], [AC08.AAE888], [AC08.AAE086], [AC08.AAE741], [AC08.AAE202], [AC08.AAA042], [AC08.AAA043], [AC08.AAA041], [AC08.AAA045], [AC08.AAZ616], [AC08.AAZ615], [AC08.AAE061], [AC08.AAE108], [AC08.AAB301], [AC08.AAB299], [AC08.AAE729], [AC08.AAE819], [AC08.AAE820], [AC08.AAE796], [AC08.AAE797], [AC08.AAE798], [AC08.AAE799], [AC08.AAE800], [AC08.AAZ625], [AC08.AAE792], [AC08.AAE150], [AC08.AAE066], [AC08.AAE748], [AC08.AAE822], [AC08.AAZ631], [AC08.AAZ650], [AC08.AAC323], [AC08.AAE013], [AC08.AAZ649], [AC08.AAE860], [AC08.AAE859], [AC08.AAE011], [AC08.AAZ692], [AC08.AAE036], [AC08.AAB034], [AC08.AAB360], [AC08.AAB359], [AC08.AAF018], [AC08.AAA431], [AC08.AAZ673], [AC08.AAA027], [AC08.AAA508], [AC08.AAA350]), filter(nil), conds(nil), nl_params_([AC08.AAZ686])1 - output([AC08.AAC001], [AC08.AAE140], [AC08.AAE792], [AC08.AAZ686], [AC08.AAZ648], [AC08.AAZ223], [AC08.AAZ159], [AC08.AAZ061], [AC08.AAB001], [AC08.AAB365], [AC08.AAE002], [AC08.AAE003], [AC08.AAA115], [AC08.AAE793], [AC08.AAE794], [AC08.AAA093], [AC08.AAC066], [AC08.AAC313], [AC08.AAC314], [AC08.AAE737], [AC08.AAB019], [AC08.AAB033], [AC08.AAE745], [AC08.AAC028], [AC08.AAC040], [AC08.AAB121], [AC08.AAE180], [AC08.AAE795], [AC08.AAE871], [AC08.AAE020], [AC08.AAE021], [AC08.AAE022], [AC08.AAE023], [AC08.AAE784], [AC08.AAE785], [AC08.AAE786], [AC08.AAE787], [AC08.AAE836], [AC08.AAE837], [AC08.AAE838], [AC08.AAE839], [AC08.AAE056], [AC08.AAE887], [AC08.AAE026], [AC08.AAE828], [AC08.AIC380], [AC08.AAE834], [AC08.AAE845], [AC08.AAE844], [AC08.AAB191], [AC08.AAE080], [AC08.AAE081], [AC08.AAE082], [AC08.AAE083], [AC08.AAE788], [AC08.AAE789], [AC08.AAE790], [AC08.AAE791], [AC08.AAE840], [AC08.AAE841], [AC08.AAE842], [AC08.AAE843], [AC08.AAE057], [AC08.AAE888], [AC08.AAE086], [AC08.AAE741], [AC08.AAE202], [AC08.AAA042], [AC08.AAA043], [AC08.AAA041], [AC08.AAA045], [AC08.AAZ616], [AC08.AAZ615], [AC08.AAE061], [AC08.AAE108], [AC08.AAB301], [AC08.AAB299], [AC08.AAE729], [AC08.AAE819], [AC08.AAE820], [AC08.AAE796], [AC08.AAE797], [AC08.AAE798], [AC08.AAE799], [AC08.AAE800], [AC08.AAZ625], [AC08.AAE150], [AC08.AAE066], [AC08.AAE748], [AC08.AAE822], [AC08.AAZ631], [AC08.AAZ650], [AC08.AAC323], [AC08.AAE013], [AC08.AAZ649], [AC08.AAE860], [AC08.AAE859], [AC08.AAE011], [AC08.AAZ692], [AC08.AAE036], [AC08.AAB034], [AC08.AAB360], [AC08.AAB359], [AC08.AAF018], [AC08.AAA431], [AC08.AAZ673], [AC08.AAA027], [AC08.AAA508], [AC08.AAA350]), filter(nil)2 - output([AC08.AAC001], [AC08.AAE140], [AC08.AAE792], [AC08.AAZ686], [AC08.AAZ648], [AC08.AAZ223], [AC08.AAZ159], [AC08.AAZ061], [AC08.AAB001], [AC08.AAB365], [AC08.AAE002], [AC08.AAE003], [AC08.AAA115], [AC08.AAE793], [AC08.AAE794], [AC08.AAA093], [AC08.AAC066], [AC08.AAC313], [AC08.AAC314], [AC08.AAE737], [AC08.AAB019], [AC08.AAB033], [AC08.AAE745], [AC08.AAC028], [AC08.AAC040], [AC08.AAB121], [AC08.AAE180], [AC08.AAE795], [AC08.AAE871], [AC08.AAE020], [AC08.AAE021], [AC08.AAE022], [AC08.AAE023], [AC08.AAE784], [AC08.AAE785], [AC08.AAE786], [AC08.AAE787], [AC08.AAE836], [AC08.AAE837], [AC08.AAE838], [AC08.AAE839], [AC08.AAE056], [AC08.AAE887], [AC08.AAE026], [AC08.AAE828], [AC08.AIC380], [AC08.AAE834], [AC08.AAE845], [AC08.AAE844], [AC08.AAB191], [AC08.AAE080], [AC08.AAE081], [AC08.AAE082], [AC08.AAE083], [AC08.AAE788], [AC08.AAE789], [AC08.AAE790], [AC08.AAE791], [AC08.AAE840], [AC08.AAE841], [AC08.AAE842], [AC08.AAE843], [AC08.AAE057], [AC08.AAE888], [AC08.AAE086], [AC08.AAE741], [AC08.AAE202], [AC08.AAA042], [AC08.AAA043], [AC08.AAA041], [AC08.AAA045], [AC08.AAZ616], [AC08.AAZ615], [AC08.AAE061], [AC08.AAE108], [AC08.AAB301], [AC08.AAB299], [AC08.AAE729], [AC08.AAE819], [AC08.AAE820], [AC08.AAE796], [AC08.AAE797], [AC08.AAE798], [AC08.AAE799], [AC08.AAE800], [AC08.AAZ625], [AC08.AAE150], [AC08.AAE066], [AC08.AAE748], [AC08.AAE822], [AC08.AAZ631], [AC08.AAZ650], [AC08.AAC323], [AC08.AAE013], [AC08.AAZ649], [AC08.AAE860], [AC08.AAE859], [AC08.AAE011], [AC08.AAZ692], [AC08.AAE036], [AC08.AAB034], [AC08.AAB360], [AC08.AAB359], [AC08.AAF018], [AC08.AAA431], [AC08.AAZ673], [AC08.AAA027], [AC08.AAA508], [AC08.AAA350]), filter(nil), is_single, dop13 - output([AC08.AAC001], [AC08.AAE140], [AC08.AAE792], [AC08.AAZ686], [AC08.AAZ648], [AC08.AAZ223], [AC08.AAZ159], [AC08.AAZ061], [AC08.AAB001], [AC08.AAB365], [AC08.AAE002], [AC08.AAE003], [AC08.AAA115], [AC08.AAE793], [AC08.AAE794], [AC08.AAA093], [AC08.AAC066], [AC08.AAC313], [AC08.AAC314], [AC08.AAE737], [AC08.AAB019], [AC08.AAB033], [AC08.AAE745], [AC08.AAC028], [AC08.AAC040], [AC08.AAB121], [AC08.AAE180], [AC08.AAE795], [AC08.AAE871], [AC08.AAE020], [AC08.AAE021], [AC08.AAE022], [AC08.AAE023], [AC08.AAE784], [AC08.AAE785], [AC08.AAE786], [AC08.AAE787], [AC08.AAE836], [AC08.AAE837], [AC08.AAE838], [AC08.AAE839], [AC08.AAE056], [AC08.AAE887], [AC08.AAE026], [AC08.AAE828], [AC08.AIC380], [AC08.AAE834], [AC08.AAE845], [AC08.AAE844], [AC08.AAB191], [AC08.AAE080], [AC08.AAE081], [AC08.AAE082], [AC08.AAE083], [AC08.AAE788], [AC08.AAE789], [AC08.AAE790], [AC08.AAE791], [AC08.AAE840], [AC08.AAE841], [AC08.AAE842], [AC08.AAE843], [AC08.AAE057], [AC08.AAE888], [AC08.AAE086], [AC08.AAE741], [AC08.AAE202], [AC08.AAA042], [AC08.AAA043], [AC08.AAA041], [AC08.AAA045], [AC08.AAZ616], [AC08.AAZ615], [AC08.AAE061], [AC08.AAE108], [AC08.AAB301], [AC08.AAB299], [AC08.AAE729], [AC08.AAE819], [AC08.AAE820], [AC08.AAE796], [AC08.AAE797], [AC08.AAE798], [AC08.AAE799], [AC08.AAE800], [AC08.AAZ625], [AC08.AAE150], [AC08.AAE066], [AC08.AAE748], [AC08.AAE822], [AC08.AAZ631], [AC08.AAZ650], [AC08.AAC323], [AC08.AAE013], [AC08.AAZ649], [AC08.AAE860], [AC08.AAE859], [AC08.AAE011], [AC08.AAZ692], [AC08.AAE036], [AC08.AAB034], [AC08.AAB360], [AC08.AAB359], [AC08.AAF018], [AC08.AAA431], [AC08.AAZ673], [AC08.AAA027], [AC08.AAA508], [AC08.AAA350]), filter([cast(cast(AC08.AAE140, VARCHAR2(3 BYTE)), NUMBER(-1, -85)) 120], [AC08.AAE792 IN (?, ?)]), access([AC08.AAC001], [AC08.AAE140], [AC08.AAE792], [AC08.AAZ686], [AC08.AAZ648], [AC08.AAZ223], [AC08.AAZ159], [AC08.AAZ061], [AC08.AAB001], [AC08.AAB365], [AC08.AAE002], [AC08.AAE003], [AC08.AAA115], [AC08.AAE793], [AC08.AAE794], [AC08.AAA093], [AC08.AAC066], [AC08.AAC313], [AC08.AAC314], [AC08.AAE737], [AC08.AAB019], [AC08.AAB033], [AC08.AAE745], [AC08.AAC028], [AC08.AAC040], [AC08.AAB121], [AC08.AAE180], [AC08.AAE795], [AC08.AAE871], [AC08.AAE020], [AC08.AAE021], [AC08.AAE022], [AC08.AAE023], [AC08.AAE784], [AC08.AAE785], [AC08.AAE786], [AC08.AAE787], [AC08.AAE836], [AC08.AAE837], [AC08.AAE838], [AC08.AAE839], [AC08.AAE056], [AC08.AAE887], [AC08.AAE026], [AC08.AAE828], [AC08.AIC380], [AC08.AAE834], [AC08.AAE845], [AC08.AAE844], [AC08.AAB191], [AC08.AAE080], [AC08.AAE081], [AC08.AAE082], [AC08.AAE083], [AC08.AAE788], [AC08.AAE789], [AC08.AAE790], [AC08.AAE791], [AC08.AAE840], [AC08.AAE841], [AC08.AAE842], [AC08.AAE843], [AC08.AAE057], [AC08.AAE888], [AC08.AAE086], [AC08.AAE741], [AC08.AAE202], [AC08.AAA042], [AC08.AAA043], [AC08.AAA041], [AC08.AAA045], [AC08.AAZ616], [AC08.AAZ615], [AC08.AAE061], [AC08.AAE108], [AC08.AAB301], [AC08.AAB299], [AC08.AAE729], [AC08.AAE819], [AC08.AAE820], [AC08.AAE796], [AC08.AAE797], [AC08.AAE798], [AC08.AAE799], [AC08.AAE800], [AC08.AAZ625], [AC08.AAE150], [AC08.AAE066], [AC08.AAE748], [AC08.AAE822], [AC08.AAZ631], [AC08.AAZ650], [AC08.AAC323], [AC08.AAE013], [AC08.AAZ649], [AC08.AAE860], [AC08.AAE859], [AC08.AAE011], [AC08.AAZ692], [AC08.AAE036], [AC08.AAB034], [AC08.AAB360], [AC08.AAB359], [AC08.AAF018], [AC08.AAA431], [AC08.AAZ673], [AC08.AAA027], [AC08.AAA508], [AC08.AAA350]), partitions(p0)4 - output([1]), filter(nil)5 - output([1]), filter(nil), dop16 - output([1]), filter(nil), access([VIEW1.B.AAZ686])7 - output([B.AAZ686]), filter(nil)8 - output([B.AAZ686]), filter(nil), access([B.AAZ686]), partitions(p[0-127])
从执行计划上看上面的SQL没有可以优化的地方了访问路径是对的表关联方式也是对的 对于一般的DBA来说可能放弃治疗了 注意观察执行计划ID 8 access([B.AAZ686]), partitions(p[0-127]) 访问了所有的分区 OB是分布式数据库会根据分区将数据打散到所有的数据节点 每次跑这个SQL都会访问所有的数据节点如果并发较高就会对整个OB带来压力 执行计划上没有优化的地方那就从SQL写法和业务逻辑入手 喵了一眼SQL写法也没问题现在只能从业务逻辑入手了查一下表和列的注释
AC08 养老保险人员实收明细表 AAC001 人员编号分区KEY AAE140 险种类型 AAE792 费用标志 AAZ686 人员缴费ID
看到这里就知道怎么优化了原始SQL语句中 NOT EXISTS 部分少加了个关联条件我们再来看一下原始SQL
SELECT * FROM AC08 WHERE (AAC001 ? AND AAE140 ? AND AAE792 IN (?,?) AND NOT EXISTS (SELECT ? FROM AC08 B WHERE AC08.AAZ686 B.AAZ686 AND B.AAE792 IN (?)))应该把SQL改成
SELECT * FROM AC08 WHERE (AAC001 ? AND AAE140 ? AND AAE792 IN (?,?) AND NOT EXISTS (SELECT ? FROM AC08 B WHERE AC08.AAZ686 B.AAZ686 AND AC08.AAC001B.AAC001 AND B.AAE792 IN (?)))因为人员缴费ID(AAZ686) 一般是与人员编号(AAC001) 一一对应的 加上AC08.AAC001B.AAC001过滤条件之后就能避免OB跨数据节点访问了 更改后的执行计划如下 |ID|OPERATOR |NAME |EST. ROWS|COST|
---------------------------------------------------------------------
|0 |EXCHANGE IN REMOTE | |1 |337 |
|1 | EXCHANGE OUT REMOTE | |1 |330 |
|2 | NESTED-LOOP ANTI JOIN| |1 |330 |
|3 | TABLE SCAN |AC08(IDX_AC08EES_AAC001) |1 |294 |
|4 | SUBPLAN SCAN |VIEW1 |1 |46 |
|5 | TABLE SCAN |B(IDX_AC08_AAZ686_AAE792)|1 |46 |
Outputs filters:
-------------------------------------0 - output([AC08.AAZ648], [AC08.AAZ223], [AC08.AAZ686], [AC08.AAC001], [AC08.AAZ159], [AC08.AAZ061], [AC08.AAB001], [AC08.AAB365], [AC08.AAE140], [AC08.AAE002], [AC08.AAE003], [AC08.AAA115], [AC08.AAE793], [AC08.AAE794], [AC08.AAA093], [AC08.AAC066], [AC08.AAC313], [AC08.AAC314], [AC08.AAE737], [AC08.AAB019], [AC08.AAB033], [AC08.AAE745], [AC08.AAC028], [AC08.AAC040], [AC08.AAB121], [AC08.AAE180], [AC08.AAE795], [AC08.AAE871], [AC08.AAE020], [AC08.AAE021], [AC08.AAE022], [AC08.AAE023], [AC08.AAE784], [AC08.AAE785], [AC08.AAE786], [AC08.AAE787], [AC08.AAE836], [AC08.AAE837], [AC08.AAE838], [AC08.AAE839], [AC08.AAE056], [AC08.AAE887], [AC08.AAE026], [AC08.AAE828], [AC08.AIC380], [AC08.AAE834], [AC08.AAE845], [AC08.AAE844], [AC08.AAB191], [AC08.AAE080], [AC08.AAE081], [AC08.AAE082], [AC08.AAE083], [AC08.AAE788], [AC08.AAE789], [AC08.AAE790], [AC08.AAE791], [AC08.AAE840], [AC08.AAE841], [AC08.AAE842], [AC08.AAE843], [AC08.AAE057], [AC08.AAE888], [AC08.AAE086], [AC08.AAE741], [AC08.AAE202], [AC08.AAA042], [AC08.AAA043], [AC08.AAA041], [AC08.AAA045], [AC08.AAZ616], [AC08.AAZ615], [AC08.AAE061], [AC08.AAE108], [AC08.AAB301], [AC08.AAB299], [AC08.AAE729], [AC08.AAE819], [AC08.AAE820], [AC08.AAE796], [AC08.AAE797], [AC08.AAE798], [AC08.AAE799], [AC08.AAE800], [AC08.AAZ625], [AC08.AAE792], [AC08.AAE150], [AC08.AAE066], [AC08.AAE748], [AC08.AAE822], [AC08.AAZ631], [AC08.AAZ650], [AC08.AAC323], [AC08.AAE013], [AC08.AAZ649], [AC08.AAE860], [AC08.AAE859], [AC08.AAE011], [AC08.AAZ692], [AC08.AAE036], [AC08.AAB034], [AC08.AAB360], [AC08.AAB359], [AC08.AAF018], [AC08.AAA431], [AC08.AAZ673], [AC08.AAA027], [AC08.AAA508], [AC08.AAA350]), filter(nil)1 - output([AC08.AAZ648], [AC08.AAZ223], [AC08.AAZ686], [AC08.AAC001], [AC08.AAZ159], [AC08.AAZ061], [AC08.AAB001], [AC08.AAB365], [AC08.AAE140], [AC08.AAE002], [AC08.AAE003], [AC08.AAA115], [AC08.AAE793], [AC08.AAE794], [AC08.AAA093], [AC08.AAC066], [AC08.AAC313], [AC08.AAC314], [AC08.AAE737], [AC08.AAB019], [AC08.AAB033], [AC08.AAE745], [AC08.AAC028], [AC08.AAC040], [AC08.AAB121], [AC08.AAE180], [AC08.AAE795], [AC08.AAE871], [AC08.AAE020], [AC08.AAE021], [AC08.AAE022], [AC08.AAE023], [AC08.AAE784], [AC08.AAE785], [AC08.AAE786], [AC08.AAE787], [AC08.AAE836], [AC08.AAE837], [AC08.AAE838], [AC08.AAE839], [AC08.AAE056], [AC08.AAE887], [AC08.AAE026], [AC08.AAE828], [AC08.AIC380], [AC08.AAE834], [AC08.AAE845], [AC08.AAE844], [AC08.AAB191], [AC08.AAE080], [AC08.AAE081], [AC08.AAE082], [AC08.AAE083], [AC08.AAE788], [AC08.AAE789], [AC08.AAE790], [AC08.AAE791], [AC08.AAE840], [AC08.AAE841], [AC08.AAE842], [AC08.AAE843], [AC08.AAE057], [AC08.AAE888], [AC08.AAE086], [AC08.AAE741], [AC08.AAE202], [AC08.AAA042], [AC08.AAA043], [AC08.AAA041], [AC08.AAA045], [AC08.AAZ616], [AC08.AAZ615], [AC08.AAE061], [AC08.AAE108], [AC08.AAB301], [AC08.AAB299], [AC08.AAE729], [AC08.AAE819], [AC08.AAE820], [AC08.AAE796], [AC08.AAE797], [AC08.AAE798], [AC08.AAE799], [AC08.AAE800], [AC08.AAZ625], [AC08.AAE792], [AC08.AAE150], [AC08.AAE066], [AC08.AAE748], [AC08.AAE822], [AC08.AAZ631], [AC08.AAZ650], [AC08.AAC323], [AC08.AAE013], [AC08.AAZ649], [AC08.AAE860], [AC08.AAE859], [AC08.AAE011], [AC08.AAZ692], [AC08.AAE036], [AC08.AAB034], [AC08.AAB360], [AC08.AAB359], [AC08.AAF018], [AC08.AAA431], [AC08.AAZ673], [AC08.AAA027], [AC08.AAA508], [AC08.AAA350]), filter(nil)2 - output([AC08.AAZ648], [AC08.AAZ223], [AC08.AAZ686], [AC08.AAC001], [AC08.AAZ159], [AC08.AAZ061], [AC08.AAB001], [AC08.AAB365], [AC08.AAE140], [AC08.AAE002], [AC08.AAE003], [AC08.AAA115], [AC08.AAE793], [AC08.AAE794], [AC08.AAA093], [AC08.AAC066], [AC08.AAC313], [AC08.AAC314], [AC08.AAE737], [AC08.AAB019], [AC08.AAB033], [AC08.AAE745], [AC08.AAC028], [AC08.AAC040], [AC08.AAB121], [AC08.AAE180], [AC08.AAE795], [AC08.AAE871], [AC08.AAE020], [AC08.AAE021], [AC08.AAE022], [AC08.AAE023], [AC08.AAE784], [AC08.AAE785], [AC08.AAE786], [AC08.AAE787], [AC08.AAE836], [AC08.AAE837], [AC08.AAE838], [AC08.AAE839], [AC08.AAE056], [AC08.AAE887], [AC08.AAE026], [AC08.AAE828], [AC08.AIC380], [AC08.AAE834], [AC08.AAE845], [AC08.AAE844], [AC08.AAB191], [AC08.AAE080], [AC08.AAE081], [AC08.AAE082], [AC08.AAE083], [AC08.AAE788], [AC08.AAE789], [AC08.AAE790], [AC08.AAE791], [AC08.AAE840], [AC08.AAE841], [AC08.AAE842], [AC08.AAE843], [AC08.AAE057], [AC08.AAE888], [AC08.AAE086], [AC08.AAE741], [AC08.AAE202], [AC08.AAA042], [AC08.AAA043], [AC08.AAA041], [AC08.AAA045], [AC08.AAZ616], [AC08.AAZ615], [AC08.AAE061], [AC08.AAE108], [AC08.AAB301], [AC08.AAB299], [AC08.AAE729], [AC08.AAE819], [AC08.AAE820], [AC08.AAE796], [AC08.AAE797], [AC08.AAE798], [AC08.AAE799], [AC08.AAE800], [AC08.AAZ625], [AC08.AAE792], [AC08.AAE150], [AC08.AAE066], [AC08.AAE748], [AC08.AAE822], [AC08.AAZ631], [AC08.AAZ650], [AC08.AAC323], [AC08.AAE013], [AC08.AAZ649], [AC08.AAE860], [AC08.AAE859], [AC08.AAE011], [AC08.AAZ692], [AC08.AAE036], [AC08.AAB034], [AC08.AAB360], [AC08.AAB359], [AC08.AAF018], [AC08.AAA431], [AC08.AAZ673], [AC08.AAA027], [AC08.AAA508], [AC08.AAA350]), filter(nil), conds(nil), nl_params_([AC08.AAZ686])3 - output([AC08.AAC001], [AC08.AAE140], [AC08.AAE792], [AC08.AAZ686], [AC08.AAZ648], [AC08.AAZ223], [AC08.AAZ159], [AC08.AAZ061], [AC08.AAB001], [AC08.AAB365], [AC08.AAE002], [AC08.AAE003], [AC08.AAA115], [AC08.AAE793], [AC08.AAE794], [AC08.AAA093], [AC08.AAC066], [AC08.AAC313], [AC08.AAC314], [AC08.AAE737], [AC08.AAB019], [AC08.AAB033], [AC08.AAE745], [AC08.AAC028], [AC08.AAC040], [AC08.AAB121], [AC08.AAE180], [AC08.AAE795], [AC08.AAE871], [AC08.AAE020], [AC08.AAE021], [AC08.AAE022], [AC08.AAE023], [AC08.AAE784], [AC08.AAE785], [AC08.AAE786], [AC08.AAE787], [AC08.AAE836], [AC08.AAE837], [AC08.AAE838], [AC08.AAE839], [AC08.AAE056], [AC08.AAE887], [AC08.AAE026], [AC08.AAE828], [AC08.AIC380], [AC08.AAE834], [AC08.AAE845], [AC08.AAE844], [AC08.AAB191], [AC08.AAE080], [AC08.AAE081], [AC08.AAE082], [AC08.AAE083], [AC08.AAE788], [AC08.AAE789], [AC08.AAE790], [AC08.AAE791], [AC08.AAE840], [AC08.AAE841], [AC08.AAE842], [AC08.AAE843], [AC08.AAE057], [AC08.AAE888], [AC08.AAE086], [AC08.AAE741], [AC08.AAE202], [AC08.AAA042], [AC08.AAA043], [AC08.AAA041], [AC08.AAA045], [AC08.AAZ616], [AC08.AAZ615], [AC08.AAE061], [AC08.AAE108], [AC08.AAB301], [AC08.AAB299], [AC08.AAE729], [AC08.AAE819], [AC08.AAE820], [AC08.AAE796], [AC08.AAE797], [AC08.AAE798], [AC08.AAE799], [AC08.AAE800], [AC08.AAZ625], [AC08.AAE150], [AC08.AAE066], [AC08.AAE748], [AC08.AAE822], [AC08.AAZ631], [AC08.AAZ650], [AC08.AAC323], [AC08.AAE013], [AC08.AAZ649], [AC08.AAE860], [AC08.AAE859], [AC08.AAE011], [AC08.AAZ692], [AC08.AAE036], [AC08.AAB034], [AC08.AAB360], [AC08.AAB359], [AC08.AAF018], [AC08.AAA431], [AC08.AAZ673], [AC08.AAA027], [AC08.AAA508], [AC08.AAA350]), filter([cast(cast(AC08.AAE140, VARCHAR2(3 BYTE)), NUMBER(-1, -85)) 120], [AC08.AAE792 IN (?, ?)]), access([AC08.AAC001], [AC08.AAE140], [AC08.AAE792], [AC08.AAZ686], [AC08.AAZ648], [AC08.AAZ223], [AC08.AAZ159], [AC08.AAZ061], [AC08.AAB001], [AC08.AAB365], [AC08.AAE002], [AC08.AAE003], [AC08.AAA115], [AC08.AAE793], [AC08.AAE794], [AC08.AAA093], [AC08.AAC066], [AC08.AAC313], [AC08.AAC314], [AC08.AAE737], [AC08.AAB019], [AC08.AAB033], [AC08.AAE745], [AC08.AAC028], [AC08.AAC040], [AC08.AAB121], [AC08.AAE180], [AC08.AAE795], [AC08.AAE871], [AC08.AAE020], [AC08.AAE021], [AC08.AAE022], [AC08.AAE023], [AC08.AAE784], [AC08.AAE785], [AC08.AAE786], [AC08.AAE787], [AC08.AAE836], [AC08.AAE837], [AC08.AAE838], [AC08.AAE839], [AC08.AAE056], [AC08.AAE887], [AC08.AAE026], [AC08.AAE828], [AC08.AIC380], [AC08.AAE834], [AC08.AAE845], [AC08.AAE844], [AC08.AAB191], [AC08.AAE080], [AC08.AAE081], [AC08.AAE082], [AC08.AAE083], [AC08.AAE788], [AC08.AAE789], [AC08.AAE790], [AC08.AAE791], [AC08.AAE840], [AC08.AAE841], [AC08.AAE842], [AC08.AAE843], [AC08.AAE057], [AC08.AAE888], [AC08.AAE086], [AC08.AAE741], [AC08.AAE202], [AC08.AAA042], [AC08.AAA043], [AC08.AAA041], [AC08.AAA045], [AC08.AAZ616], [AC08.AAZ615], [AC08.AAE061], [AC08.AAE108], [AC08.AAB301], [AC08.AAB299], [AC08.AAE729], [AC08.AAE819], [AC08.AAE820], [AC08.AAE796], [AC08.AAE797], [AC08.AAE798], [AC08.AAE799], [AC08.AAE800], [AC08.AAZ625], [AC08.AAE150], [AC08.AAE066], [AC08.AAE748], [AC08.AAE822], [AC08.AAZ631], [AC08.AAZ650], [AC08.AAC323], [AC08.AAE013], [AC08.AAZ649], [AC08.AAE860], [AC08.AAE859], [AC08.AAE011], [AC08.AAZ692], [AC08.AAE036], [AC08.AAB034], [AC08.AAB360], [AC08.AAB359], [AC08.AAF018], [AC08.AAA431], [AC08.AAZ673], [AC08.AAA027], [AC08.AAA508], [AC08.AAA350]), partitions(p0)4 - output([1]), filter(nil), access([VIEW1.B.AAZ686])5 - output([B.AAZ686]), filter([B.AAC001 1026005878]), access([B.AAC001], [B.AAZ686]), partitions(p0)
执行计划中的PX消失了(你可以理解为跨界点访问)说明数据访问关联都在一个节点完成 最终SQL由每次0.5秒-2秒优化到每次0.05秒性能提升了10倍 算上每天跑20w次平均耗费20%的CPU资源那么这一个点的优化就可以将CPU资源从20%降低到2%
最后有些小伙伴会有疑问你咋知道SQL的NOT EXISTS应该加AC08.AAC001B.AAC001过滤条件原因有2个
1. 业务逻辑反推(得有开发业务思维纯运维DBA可能没这个思维) 2. AAC001是分区key
还有些小伙伴可能还有疑问如果没有开发业务思维怎么办 也可以写个SQL检查AAC001与AAZ686的对应关系
select *from (select AAZ686, count(*) cntfrom (select AAZ686, AAC001 from ac08 group by AAZ686, AAC001)group by AAZ686order by 2 desc)where rownum 10;
如果CNT都是1就证明了我们的逻辑反推如果CNT1得和业务确认看看表中数据是否有问题
讲到这里还遇到点插曲最开始查询的时候确实是1过了2周我准备写博客了再去查询发现CNT变成2了把我吓了一跳 最终找到开发商和业务确认数据有错误。搞优化的同时帮开发商发现了数据质量问题这尼玛...
