Below, I have prepared a list of the most common database modeling interview questions, along with their correct answers. These questions give you an idea of how to prepare for an interview. But let me warn you first: while thoroughly studying this list of questions and answers helps you sh...
Use the buffer cache advisory over a given workload and then query the v$db_cache_advice table. If a change was necessary then I would use the alter system set db_cache_size command.Read More 25 :: Explain an ORA-01555 You get this error when you get a snapshot too ...
Why are you interested in being a database administrator for our company? A competent candidate will research the company and understand the job description fully before arriving at the interview. The goal of the question is to determine the candidate's preparation for the interview process. What ...
Self-join is query used to join a table to itself. Aliases should be used for the same table comparison. 25. What is Cross Join? Cross Join will return all records where each row from the first table is combined with each row from the second table. Database Views Interview Questions 26...
contrast, virtual ports are also present on your computer. Virtual ports give computers the ability to run applications and “listen” for connections from external computers. Virtual ports are used by SQL Server to run your database query and listen for application and external computer connections...
Create Database Drop Database Select Database Data Types Create Tables Insert Query Select Query Mysql miscellaneous Where Clause Update Query Delete Query Sorting Results Using Join NULL Values Transactions Alter Command Indexes Database Info Using Sequences Which...
1. Please write a query based on T1 and T2 which produces: ColA ColB 1 10 2 20 3 20 3 30 4 30 4 40 5 30 5 50 6 30 6 60 (Hint: the result set is produced from merging T1 and T2 together, without duplicate values)
SQL Server Long Running Query How to check SQL Server Performance issues || SQL Server Long Running Query || SQL Server Query Running Slow SELECT […] MS SQL Server Notes 1. SQL Server Versions: SQL Server 1.0 SQL Server 4.0 SQL Server 6.0 SQL Server 7.0 SQL Server 8.0 (SQL […] How...
Instead of re-sorting for each query, the system can access records in the order specified by the index. Although indexes speed up data retrieval, they can slow down inserting, updating, and deleting, since the index has to be rebuilt whenever a record is changed. A view is simply a ...
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