Oracle Server supports two different forms of replication: Basic and Advanced replication. Explain difference between these.

Correct Answer: The following are the areas of concern for tuning: - Memory Usage - Data Storage - Data Manipulation - Physical Storage - Logic Storage - Network Traffic Tuning Memory Usage: In Oracle 10g, we can use the Automatic Workload Repository (AWR) toolset to gather and manage statistical data but in case of Oracle 11g, we can use new initialization parameters such as MEMORY_TARGET to further control the overall memory used by Oracle It helps us to tune the database automatically when we don?t have time to read the AWR report Tuning Data Manipulation: There are two ways to tune Data manipulation in Oracle one way is through Conventional Path mode and second is Direct Path mode Tuning Physical Storage: We need to tune the physical storage because it limits the disk in database This can be done by: Distributing I/O, Striping and Mirroring

Correct Answer: We need to first login to the data base as: SQLPLUS followed by user_name/password Then we need to execute the following query: CREATE USER user_name IDENTIFIED BY abcd; in this query a user_name suggest the user that is created which has a password abcd which is required for login in database

Correct Answer: An index is a object which is used to improve performance during retrieval of records CREATE [UNIQUE] INDEX index_name ON employee[emp_id, emp_name,dept_id] [COMPUTE STATISTICS] The UNIQUE keyword is used when combined values of the index should be unique The COMPUTE STATISTICS during the creation of index optimizes the plan of execution of the SQL statement and improves performance

Correct Answer: The CACHE option means how many sequences will be stored in memory for access by the application objects The performance is faster However in case of the database is down the data is memory is lost for the sequence The NO CACHE option means values are not stored in memory So there might be some performance issue

Correct Answer: A sequence is a database object that is used to generate sequential number CREATE SEQUENCE seqname [increment] [minimum value][maximum value][start][cache][cycle] Nextval and currval lets us get the next value and current value from the sequence

Correct Answer: Oracle HTTP Server is the Web server component of Oracle Database It is based on the Apache HTTP Server It is robust and reliable server due to following features: - Provide high availability infrastructure integration with Oracle Process Manager and Notification Server (OPMN), for process management, death detection and failover for Oracle HTTP Server processes - Provide Dynamic Monitoring Services (DMS) metrics that give runtime performance statistics for Oracle HTTP Server processes - Enable securing of transactions with Secure Sockets Layer (SSL) technology - Execute Perl scripts in the same process as the Oracle HTTP Server, or as CGI script

Correct Answer: Oracle HTTP Server is managed by OPMN which stands for Oracle Process Manager and Notification Server With the use of opmnctl utility we can start, stop and restart Oracle HTTP Server If we don?t use this utility the configuration management infrastructure cannot detect or communicate with the Oracle HTTP Server processes, and problems may occur The startproc command for the case of Windows is: ORACLE_HOME\opmn\bin> opmnctl [verbose] startproc ias-component=HTTP_Server To stop Oracle HTTP Server, use the stopproc command: Windows: ORACLE_HOME\opmn\bin> opmnctl [verbose] stopproc ias-component=HTTP_Server

Correct Answer: We use SQLPASSTHROUGH options when we need applications to access data both in the front-end and back-end data servers with a single connection SQL statements that cannot be executed in the solidDB front-end server are passed over to the back end SQLPASSTHROUGH mode can be set as per session or per transaction The connection between the front end and back end is made with a back-end compatible ODBC driver which is loaded dynamically in solidDB server

Correct Answer: Personal Oracle lite is single user database for distributed and mobile computing It supports a full range of Java database features as well as advanced replication Or in other words it is Oracle's lightweight, fully-functional, single-user object- relational database A small, zero administration embedded database Some of the features supported: - Java Support - Java Store Procedure Support - Java triggers Supported - Multi-column indexing and outer joins - Easy to use graphical user interface - Supports both object and relational database models - Simultaneous viewing of classes and relational tables

Correct Answer: The backup strategies that are provided by Oracle are as follows: - Logical backup using Exports and import - Physical file system backup - RMAN Recovery Manger which is also known as incremental files system backup