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Complete guide to Green plum database administrator :

The below information explains the basic system administration tasks performed by a Greenplum Database administrator.

1.starting and stopping greenplum database:

The database server instances are started or stopped across all of the hosts in the system in such a way that they can act together as a unified Data base management system.Because a Greenplum Database system is shared across many machines, the process for starting and stopping a Greenplum database management system is different than the process for starting and stopping a regular Postgre SQL DBMS.

2.Accesing the database:

Using a PostgreSQL and compatible client program users can connect to Greenplum Database such as psql. Users and administrators connect to Greenplum Database through the master.The segments cannot accept client connections.

3.Configuring greenplum system:

It can be configured using server configuration parameters.Server configuration parameters affect the behavior of Greenplum Database. They are part of the PostgreSQL "Grand Unified Configuration" system, so they are sometimes called "GUCs."

4.Enabling high availability features:

When Greenplum Database High Availability is activated,primary and mirror are the two segments used in enabling the feature. Each primary segment has one corresponding mirror segment. A primary segment takes requests from the master inorder to change the segment's database and then replicates those changes to the corresponding mirror. If a primary segment gets unreachable then the database queries fail over to the mirror segment.

5.Backing up and restoring databases:

By Taking regular backups ensures that you can restore your data if data corruption or system failure occur. You can also use backups to transfer data from one Greenplum Database system to another system. Greenplum Database supports parallel and non-parallel backup and restore. Parallel backup and restore operations scale regardless of the number of segments in your system. Greenplum Database also supports non-parallel backup and restore utilities to activate migration from PostgreSQL to Greenplum

6.Expanding a greenplum system:

To scale up performance and storage capacity, you expand the system by adding hosts to the array. Perform the operations with the system offline. The greenplum expand utility stops the database during initialization if an administrator has not already done.

7.Migrating Data with Gp transfer:

The gptransfer migration utility transfers Greenplum Database metadata and data from one Greenplum database to another database, letting you to transfer the entire contents of a database or to another database

8.Monitoring a greenplum system:

Monitoring Greenplum system using different tools included with the system or available as add-ons. SNMP support allows Greenplum to be merged up with popular system management frameworks.Observing the Greenplum Database system day-to-day performance helps administrators understand the system behavior, plan workflow, and troubleshoot problems.

9.Routine system maintenance tasks:

The database must be frequently removed from expired data and the table statistics must be updated so that the query planner has precise information.Greenplum Database needs that certain tasks should be performed regularly to reach optimal performance. Therefore Greenplum Database system runs efficiently,

The tasks discussed here are needed, but database administrators can automate them by using UNIX tools like cron scripts. An administrator sets up the appropriate scripts and checks that they perform successfully.

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