MySQL Database Operations

MySQL Database Operations

Easy Questions

MYSQL

MySQL Subquery
MySQL Character Set
MySQL Views
Mysql Basic
Mysql Setup
Mysql Foreign Keys
Mysql Query Optimization
Interacting With MySQL
Server SQL Mode
MySQL Events
MySQL UNION
MySQL Full-Text Search
MySQL Command Line Tool
Mysql Error handling
Mysql Compound Statements
MySQL Stored Procedures
MySQL Stored Functions
MySQL Triggers
MySQL Connectors and APIs
Connection
MySQL Functions
MySQL Operators
MySQL Table Operations
MySQL Internationalization and Localization
MySQL Database Operations
MySQL Access Control and Security
MySQL Type Conversion in Expression Evaluation
MySQL Scheduling and Locking Issues
MySQL ORDER BY
MySQL HAVING
MySQL GROUP BY
MySQL Optimization
Managing MySQL Users
MySQL Programs
Access Control for MySQL Stored Programs and Views
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
  1. Usage of aggregates in WHERE clause is not allowed.










  1. View Hint View Answer Discuss in Forum

    NA

    Correct Option: B

    The usage of aggregates inside ‘WHERE’ clauses is not allowed. For example, the following statement will not work : ‘SELECT * FROM my_table WHERE attribute_name = MAX(attribute_name)’, because the MAX value is not known yet.

  1. The logging option to enable binary log index file is ______________.










  1. View Hint View Answer Discuss in Forum

    NA

    Correct Option: D

    The ‘–log-bin-index’ is the logging option that enables the binary log index file. ‘–log-error’ enables the error log file. Similarly, –log enables the general log file.

  1. The default value in seconds in the system variable ‘long_query_time’ is ______________.










  1. View Hint View Answer Discuss in Forum

    NA

    Correct Option: D

    The server maintains a ‘long_query_time’ system variable that defines slow queries (10 seconds by default). If a query takes more than these seconds of real time it is considered slow.

  1. The log that identifies statements that may be in need of being rewritten for better performance is ______________.










  1. View Hint View Answer Discuss in Forum

    NA

    Correct Option: B

    The purpose of the slow-query log is to help the identification of statements that may be in need of being rewritten for better performance. This helps in query optimizations.

  1. The log that contains a record of server startups and shutdowns and the messages about exceptional conditions is ______________.










  1. View Hint View Answer Discuss in Forum

    NA

    Correct Option: C

    The error log contains a record of server startups and shutdowns and the messages about problems or exceptional conditions. If the server fails to start this log provides the help.