sql-execution-plan

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EXPLAIN and COUNT returning two different values

i am doing: explain select * from calibration; it says 52133456345632 rows when i do: select count(*) from calibration;[详细]

2023-01-01 19:58 分类：问答
Does Oracle re-hash the driving table for each join on the same table columns?

Say you\'ve got the following query on 9开发者_StackOverflow中文版i: SELECT /*+ USE_HASH(t2 t3) */[详细]

2023-01-01 17:03 分类：问答
MySQL, delete and index hint

I have to delete about 10K rows from a table that has more than 100 million rows based on some criteria. When I execute the query, it takes about 5 minutes. I ran an explain plan (the delete query con[详细]

2023-01-01 12:41 分类：问答
Same query, different execution plans

I am trying to find a solution for a problem that is driving me mad... I have a query which runs very fast in a QA Server but it is very slow in开发者_开发问答 production. I realized that they have d[详细]

2022-12-31 07:21 分类：问答
Oracle EXECUTE IMMEDIATE changes explain plan of query

I have a stored procedure that I am calling using EXECUTE IMMEDIATE.The issue that I am facing is that the explain plan is different when I call the procedure directly vs when I use EXECUTE IMMEDIATE[详细]

2022-12-29 19:07 分类：问答
Oracle: Difference in execution plans between databases

I am comparing queries my development and production database. They are both Oracle 9i, but almost every single query has a completely different execution plan depending on the database.[详细]

2022-12-28 04:32 分类：问答
Stored procs breaking overnight

We are running MS SQL 2005 and we have been experiencing a very peculiar problem the past few days. I have two procs, one that creates an hourly report of data.And another that calls it, puts its res[详细]

2022-12-28 00:06 分类：问答
滴滴车主App上线试行“司机收入报告”？

8月16日，滴滴网约车司机生态发展委员会发布公告称，滴滴车主App上线试行“司机收入报告”。在沈阳、长春、保定、秦皇岛、鞍山、淄博和安顺的滴滴司机可以率先体验。试行期间，滴滴司机生态委员会将继续收集司机的意[详细]

2022-12-27 17:40 分类：问答
王者荣耀评分刷新历史新低未成年防沉迷系统升级后引发学生不满？

对于未成年防沉迷系统的大规模实施，王者荣耀可以说是一开始就积极和实行这项政策的游戏，而王者荣耀的人气还有玩家规模是有目共睹的，尤其是未成年人的占比不说是否占据优势，起码数量上*是各大游戏中首屈一指的，而[详细]

2022-12-27 09:18 分类：问答
Poor execution plans when using a filter and CONTAINSTABLE in a query

We have an interesting problem that I was hoping someone could help to shed some light on.At a high level the problem is as below:[详细]

2022-12-26 23:28 分类：问答