Introduction What's JDBC JDBC stands for Java Database Connectivity, which is a standard Java API for database-independent connectivity between the Java programming language and a wide range of databases. JDBC library (includes APIs)的主要用途包括 Making a…
QUESTION 13 View the Exhibit.Examine the following command that is executed for the TRANSPORT table in the SH schema:SQL> SELECT DBMS_STATS.CREATE_EXTENDED_STATS('sh', 'customers_obe', '(country_id,cust_state_province)') FROM dual;Which statement des…
SQL Server 中什么情况会导致其执行计划从索引查找(Index Seek)变成索引扫描(Index Scan)呢? 下面从几个方面结合上下文具体场景做了下测试.总结.归纳. 1:隐式转换会导致执行计划从索引查找(Index Seek)变为索引扫描(Index Scan) Implicit Conversion will cause index scan instead of index seek. While implicit conversions occur in SQL Serve…
DEBUGGING STORED PROCEDURES Over the past several weeks, we’ve been working on debugging a stored procedure bug for a client. Coming from a software development background, I looked at the procedure like any piece of code — how can I debug the progra…
[PHP];;;;;;;;;;;;;;;;;;;; About php.ini ;;;;;;;;;;;;;;;;;;;;; PHP's initialization file, generally called php.ini, is responsible for; configuring many of the aspects of PHP's behavior.; php的初始化文件,通常叫做php.ini,负责配置php很多层面的行为; PHP attempts to find an…
[PHP] ;;;;;;;;;;;;;;;;;;; ; About php.ini ; ;;;;;;;;;;;;;;;;;;; ; This file controls many aspects of PHP’s behavior. In order for PHP to ; read it, it must be named ‘php.ini’. PHP looks for it in the current ; working directory, in the path designate…
引用自:http://rusanu.com/2013/08/01/understanding-how-sql-server-executes-a-query/ Understanding how SQL Server executes a query August 1st, 2013 If you are a developer writing applications that use SQL Server and you are wondering what exactly happens…