Oracle System Engineer Interview Questions and Answers

SAN and NAS are storage solutions that provide data access over a network, each with distinct architectures and use cases.

• SAN (Storage Area Network) connects storage devices to servers via a high-speed network, often using Fibre Channel.

• NAS (Network Attached Storage) is a dedicated file storage device that connects to a network, allowing multiple users to access files.

• SAN is typically used in enterprise environmen...read more

SAN (Storage Area Network) is a dedicated network that provides access to consolidated, block-level data storage.

• SANs connect multiple servers to a centralized storage system, improving data management.

• They use high-speed network technologies like Fibre Channel or iSCSI.

• Example: A SAN can support virtualized environments by providing shared storage for multiple virtual machines.

• SANs enhance data availability and d...read more

Linux booting process involves several stages from power on to user login.

• BIOS/UEFI firmware initializes hardware

• Bootloader (GRUB) loads kernel into memory

• Kernel initializes system processes and mounts root filesystem

• Init process starts user space processes and services

• User login prompt is displayed

Installing RAC involves configuring shared storage, network, and Oracle Grid Infrastructure.

• Prepare shared storage for Oracle Clusterware files

• Configure network settings for interconnect and public network

• Install Oracle Grid Infrastructure software on all nodes

• Run the Oracle Clusterware Configuration Wizard to create the cluster

• Install Oracle RAC software on all nodes

• Create the database using Database Configuratio...read more

To improve performance of a database or SQL, optimize queries, use indexes, normalize data, and consider hardware upgrades.

• Optimize queries by using proper indexing and avoiding unnecessary joins

• Normalize data to reduce redundancy and improve data integrity

• Consider hardware upgrades such as increasing RAM or using solid-state drives

• Monitor and analyze query performance using tools like SQL Profiler or EXPLAIN

Paging is a memory management scheme that allows the operating system to move data between RAM and disk storage.

• Paging involves dividing memory into fixed-size blocks called pages.

• When a program needs more memory than is available in RAM, the operating system swaps out less-used pages to disk to free up space.

• Paging helps in efficient memory management and allows for virtual memory usage.

• Examples include Windows u...read more

A program to find a palindrome word in a 2D matrix of strings.

• Iterate through each row and column of the matrix

• Check if each string is a palindrome using two pointers approach

• Return the first palindrome word found

Intercompany process in Oracle Projects involves transactions between different legal entities within the same organization.

• Intercompany process facilitates financial transactions between different legal entities within the organization.

• It ensures accurate recording of revenue, costs, and profits for each legal entity involved.

• Intercompany transactions are typically managed through intercompany billing and interco...read more