Table of Contents

13 Configurazione del database Oracle

13 Configurazione del database Oracle

Overview

This section contains instructions for creating Oracle database and configuring connections between the database and Zabbix server, proxy, and frontend.

Database creation

We assume that a zabbix database user with password password exists and has permissions to create database objects in ORCL service located on the host Oracle database server. Zabbix requires a Unicode database character set and a UTF8 national character set. Check current settings:

sqlplus> select parameter,value from v$nls_parameters where parameter='NLS_CHARACTERSET' or parameter='NLS_NCHAR_CHARACTERSET';

Now prepare the database:

shell> cd /path/to/zabbix-sources/database/oracle
       shell> sqlplus zabbix/password@oracle_host/ORCL
       sqlplus> @schema.sql
       # stop here if you are creating database for Zabbix proxy
       sqlplus> @images.sql
       sqlplus> @data.sql

Please set the initialization parameter CURSOR_SHARING=FORCE for best performance.

Connection set up

Zabbix supports two types of connect identifiers (connection methods):

Easy Connect
Net Service Name

Connection configuration parameters for Zabbix server and Zabbix proxy can be set in the configuration files. Important parameters for the server and proxy are DBHost, DBUser, DBName and DBPassword. The same parameters are important for the frontend: $DB["SERVER"], $DB["PORT"], $DB["DATABASE"], $DB["USER"], $DB["PASSWORD"].

Zabbix uses the following connection string syntax:

{DBUser/DBPassword[@<connect_identifier>]}

<connect_identifier> can be specified either in the form of "Net Service Name" or "Easy Connect".

@[[//]Host[:Port]/<service_name> | <net_service_name>]

Easy Connect

Easy Connect uses the following parameters to connect to the database:

Host - the host name or IP address of the database server computer (DBHost parameter in the configuration file).
Port - the listening port on the database server (DBPort parameter in the configuration file; if not set the default 1521 port will be used).
<service_name> - the service name of the database you want to access (DBName parameter in the configuration file).

Example:

Database parameters set in the server or proxy configuration file (zabbix_server.conf and zabbix_proxy.conf):

DBHost=localhost
       DBPort=1521
       DBUser=myusername
       DBName=ORCL
       DBPassword=mypassword

Connection string used by Zabbix to establish connection:

DBUser/DBPassword@DBHost:DBPort/DBName

During Zabbix frontend installation, set the corresponding parameters in the Configure DB connection step of the setup wizard:

Database host: localhost
Database port: 1521
Database name: ORCL
User: myusername
Password: mypassword

Alternatively, these parameters can be set in the frontend configuration file (zabbix.conf.php):

$DB["TYPE"]                     = 'ORACLE';
       $DB["SERVER"]                   = 'localhost';
       $DB["PORT"]             = '1521';
       $DB["DATABASE"]                 = 'ORCL';
       $DB["USER"]                     = 'myusername';
       $DB["PASSWORD"]                 = 'mypassword';

Net service name

Since Zabbix 5.4.0 it is possible to connect to Oracle by using net service name.

<net_service_name> is a simple name for a service that resolves to a connect descriptor.

In order to use the service name for creating a connection, this service name has to be defined in the tnsnames.ora file located on both the database server and the client systems. The easiest way to make sure that the connection will succeed is to define the location of tnsnames.ora file in the TNS_ADMIN environment variable. The default location of the tnsnames.ora file is:

$ORACLE_HOME/network/admin/

A simple tnsnames.ora file example:

ORCL =
         (DESCRIPTION =
           (ADDRESS = (PROTOCOL = TCP)(HOST = localhost)(PORT = 1521))
           (CONNECT_DATA =
             (SERVER = DEDICATED)
             (SERVICE_NAME = ORCL)
           )
         )

To set configuration parameters for the "Net Service Name" connection method, use one of the following options:

Set an empty parameter DBHost and set DBName as usual:

DBHost=
       DBName=ORCL

Set both parameters and leave both empty:

DBHost=
       DBName=

In the second case, the TWO_TAKS environment variable has to be set. It specifies the default remote Oracle service (service name). When this variable is defined, the connector connects to the specified database by using an Oracle listener that accepts connection requests. This variable is for use on Linux and UNIX only. Use the LOCAL environment variable for Microsoft Windows.