11g RAC R2 Architecture---Grid

Source: Internet
Author: User

Agent-based Management method

Starting with the concept of multiuser in Oracle 11.2, Oracle began using a set of multi-threaded daemon to support the use and management of resources for multiple users at the same time, daemon called agents. These agents are memory-resident processes.

Classification of agents
    • Oracle Grid 11.2 has multiple agents, of which two are the most important of the Oracle Agnet and Oracle root agent.
    • Oracle Agnet is run as an Oracle user (this Oracle user is a generic, may be grid or Oracle depending on the occasion)
    • The Oracle root agent is the name of the process that runs the operating system of this two agent as the root user: Oraagent and Orarootagent
    • The Ohas stack will start a set of Oracle Agnet and Oracle root agents. Oracle Agnet initiated by Ohas is run as a grid installation user.
    • The CRS stack also initiates a set of Oracle Agnet and Oracle root agents. If the user who installs the grid is not Oracle, it is a grid. The two Oracle agnet will be started.
Diagram of Agent and resource

corresponding log structure (by hierarchy of tree graph)

First floor

    • OHASD logs are located at: $Grid _home/log/

The second layer: (OHASD agent)

    • Cssdagent logs are located at: $Grid _home/log/
    • Cssdmonitor logs are located at: $Grid _home/log/
    • Orarootagent logs are located at: $Grid _home/log/
    • Oraagent logs are located at: $Grid _home/log/

Third tier (resources)

    • CSSD logs are located at: $Grid _home/log/
    • CRSD logs are located at: $Grid _home/log/
    • CTSSD logs are located at: $Grid _home/log/
    • DiskMon logs are located at: $Grid _home/log/

OHASD the corresponding log of the resources managed by Oraagent:

    • ORA.EVMD logs are located at: $Grid _home/log/
    • ORA.MDNSD logs are located at: $Grid _home/log/
    • ORA.GPNPD logs are located at: $Grid _home/log/
    • ORA.GIPCD logs are located at: $Grid _home/log/

Fourth floor (agent of CRSD)

    • Orarootagent logs are located at: $Grid _home/log/
    • Oraagent (GRID) logs are located at: $Grid _home/log/
    • Oraagent (Oracle) logs are located at: $Grid _home/log/

11g RAC R2 Architecture---Grid

Contact Us

The content source of this page is from Internet, which doesn't represent Alibaba Cloud's opinion; products and services mentioned on that page don't have any relationship with Alibaba Cloud. If the content of the page makes you feel confusing, please write us an email, we will handle the problem within 5 days after receiving your email.

If you find any instances of plagiarism from the community, please send an email to: info-contact@alibabacloud.com and provide relevant evidence. A staff member will contact you within 5 working days.

A Free Trial That Lets You Build Big!

Start building with 50+ products and up to 12 months usage for Elastic Compute Service

  • Sales Support

    1 on 1 presale consultation

  • After-Sales Support

    24/7 Technical Support 6 Free Tickets per Quarter Faster Response

  • Alibaba Cloud offers highly flexible support services tailored to meet your exact needs.