1 row in set (0.00 sec) (root@yayun-mysql-server) [test]> c. range:索引范围扫描,对索引的扫描开始于某一点,返回匹配值域的行。显而易见的索引范围扫描是带有between或者where子句里带有<, >查询。当mysql使用索引去查找一系列值时,例如IN()和OR列表,也会显示range(范围扫描),当然性能上面是有差异的。
Because the number of items in an order could be different each time, I pass in the data as an XML file, and get SQL Server to iterate through the elements and insert each item one by one. So far this works very well.If the stored procedure failed and had to roll back, I also ...
In the tree view of the Preferences window, select Data > Visual Explain. On the Visual Explain page, set the following options: Specify whether to launch the Visual Explain wizard when you right-click an SQL statement, view, stored procedure, or user-defined function and select Visual ...
Automapper and creating DTO class from stored procedure AutoMapper and Task Type Automated Web button click in WebBrowser control Automatic backup of a database using C#.net Automatically insert last row as Total in DatagridView C# Automatically run my exe when startup my computer in C# Avoid ...
Debugging stored procedures in PostgreSQL can present challenges, particularly due to the lack of integrated debugging tools. Developers may encounter difficulties when dealing with complex code structures, such as nested loops and dynamic SQL, especially when addressing performance issues...
After the statement has executed, you can display the plan by querying the V$SQL_PLAN view. V$SQL_PLAN contains the execution plan for every statement stored in the cursor cache. Its definition is similar to the PLAN_TABLE. See “PLAN_TABLE Columns”. ...
If this was a data-modifying stored procedure, the user may be surprised to find that EXPLAIN had a data-manipulation side-effect.[8 Oct 2007 22:43] Philip Stoev An example with a stored function that performs an INSERT: mysql> CREATE TABLE `log` ( `f1` int(11) NOT NULL AUTO_...
This is useful if you want to be able to have multiple execution plans stored in the plan table at once—giving each execution plan a distinct name enables you to determine which rows in the plan table belong to which execution plan. The EXPLAIN PLAN statement runs quickly because all ...
Cause: Either the materialized view does not reference the base tables found in the query or it was found to be ineligible by query rewrite. Action: No action required. QSM-01011 when heuristic rewrite not set, rewrite hint required Cause: When using a stored outline, a rewrite hint is ...
To access the section actuals, you perform a section explain using the EXPLAIN_FROM_ACTIVITY stored procedure. Analysis of section actuals information in explain output Section actuals, when available, are displayed in different parts of the explain output. Where to find section actuals information...