sql-execution-plan
Oracle explain plan estimates incorrect cardinality for an index range scan
I have an Oracle 10.2.0.3 database, and a query like this: select count(a.id) from LARGE_PARTITIONED_TABLE a[详细]
2023-01-05 21:04 分类：问答PostgreSql: different query plans with identical columns
I have a table with 2 foreign keys, lets call them fk1 and fk2. Both have identical types, and identical indices. But when I \"explain\" a simple select query, I get completely different query p开发者[详细]
2023-01-05 14:09 分类：问答What is the significance of the order of statements in mysql explain output?
This is mysql explain plan for one of the query I am looking into. +----+开发者_如何学运维-------------+--------+-------+---------------+---------+---------+------+------+-------+[详细]
2023-01-04 16:33 分类：问答Are execution plan for functions cached in SQL server?
Can any body help me in understanding if the execution plan for functions cached in SQL server? Any online reso开发者_如何学编程urce for this?The accepted answer is inaccurate / misleading, primarily[详细]
2023-01-04 12:41 分类：问答Different Parameter Value Results In Slow Query
I have an sproc in SQL Server 2008. It basically builds a string, and then runs the query using EXEC():[详细]
2023-01-04 04:56 分类：问答Query Execution Plan Tool - Java [closed]
Clo开发者_运维技巧sed. This question does not meet Stack Overflow guidelines. It is not currently accepting answers.[详细]
2023-01-03 23:42 分类：问答Easy comparing MySQL plans in Django
is there a way to print out query for example from this line of code Model.objects.all().order_by(sort_headers.get_order_by())[详细]
2023-01-03 18:16 分类：问答Different execution plan for similar queries
I am running two very similar update queries but for a reason unknown to me they are using completely different execution plans.Normally this wouldn\'t be a problem but they are both updating exactly[详细]
2023-01-02 12:59 分类：问答What does SQL Server execution plan show?
There is the following code: declare @XmlData xml = \'<Locations> <Location rid=\"1\"/> </Locations>\'[详细]
2023-01-02 08:58 分类：问答SQL data execution plan
Does SELECT TOP 1000 * FROM TABLE return the same data execution plan as SELECT * FROM TABLE? Please also let me know if this should 开发者_如何学Pythonbe moved to ServerFault.[详细]
2023-01-02 04:44 分类：问答
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