Exadata Interview Questions Part -2

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• What is cell disk ?
• What is grid disk ?
• What is IORM ?
• What are the ways to migrate on Exadata ?
• Procedure to drop cell disk on Exadata.
• What is cellsrv and how it works ?
• Use of cellsrv service on Exadata storage cell.
• What is iDB protocol ?
• What is the purpose to use Exacheck tool ?
• What is the oswatcher and how it works ?
• What is RS services and how it works ?
• How to enable HCC on database table ?
• How many networks are available on Exadata ?
• How we can integrate OEM12c with Exadata ?
• What are the ways to install OEM12c agent on Exadata ?
• Which cell services are running on Exadata storage cell ?
• Purpose of MS(management service) on storage cell.
• How cell storage software backup happens ?
• Which OS supports by Exadata ?
• How to power off Exadata Machine ?
• How to do maintainance on Cell Storage and DB server?
• What is writet-through caching mode ?
• What is Write-back caching mode ?
• Explain the procedure to drop the Cell storage ?
• How to replace physical storage disk on cell storage ?

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Cell Storage Processes

There are three processes will be running on the cell stoarge servers.

cellsrv - Cell Server

It is mutlithreaded process. The primary storage software components. Responsible for disk I/O with the use of iDB protocol.It communicates with Oracle Database to serve simple block requests like database buffer cache reads and Sart Scan requests like tablespaces with projections and filters. CELLSRV also implements I/ORM and collect statistics relating to its operation

MS - Management Server

This is the intermediater between command line interface and cell storage. It provide the interface of storage for configuration and administration purpose. It works with cellcli.It is also responsible to send alerts and collect statistics.

RS - Restart Server

Restart service will monitor the cellsrv and MS processes. It restarts them if necessary.

Exadata Terms

HP - High Performance

HC - High Capacity

IOPS - IOs Per Second

LUN - Logical Unit Number

MS - Management Server

RS - Restart Server

Cellsrv – Cell Server

SATA - Serial Advanced Technology Attachment

SAS - Serial Attached SCSI

PDU - Power Distribution Unit

ILOM - Integrated Lights Out Manager

IB - InfiniBand

EHCC - Exadata Hybrid Columnar Compression

CU - Compression Unit

UDMs - User Defined Metrics

RDS - Reliable Data Socket protocol

SNMP - Simple Network Management Protocol

iDB - Intelligent Database protocol

EM - Enterprise Manager

EMGC - Enterprise Manager Grid Control

DBRM - Database Resource Manager