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ODBC monitoring corresponds to the Database monitor item type in the Zabbix frontend.
ODBC is a C programming language middle-ware API for accessing database management systems (DBMS). The ODBC concept was developed by Microsoft and later ported to other platforms.
Zabbix may query any database, which is supported by ODBC. To do that, Zabbix does not directly connect to the databases, but uses the ODBC interface and drivers set up in ODBC. This function allows for more efficient monitoring of different databases for multiple purposes - for example, checking specific database queues, usage statistics and so on. Zabbix supports unixODBC, which is one of the most commonly used open source ODBC API implementations.
The suggested way of installing unixODBC is to use the Linux operating system default package repositories. In the most popular Linux distributions unixODBC is included in the package repository by default. If it's not available, it can be obtained at the unixODBC homepage: http://www.unixodbc.org/download.html.
Installing unixODBC on RedHat/Fedora based systems using the yum package manager:
shell> yum -y install unixODBC unixODBC-devel
Installing unixODBC on SUSE based systems using the zypper package manager:
# zypper in unixODBC-devel
A unixODBC database driver should be installed for the database, which will be monitored. unixODBC has a list of supported databases and drivers: http://www.unixodbc.org/drivers.html. In some Linux distributions database drivers are included in package repositories. Installing MySQL database driver on RedHat/Fedora based systems using the yum package manager:
shell> yum install mysql-connector-odbc
Installing MySQL database driver on SUSE based systems using the zypper package manager:
zypper in MyODBC-unixODBC
ODBC configuration is done by editing the odbcinst.ini and odbc.ini files. To verify the configuration file location, type:
shell> odbcinst -j
odbcinst.ini is used to list the installed ODBC database drivers:
[mysql] Description = ODBC for MySQL Driver = /usr/lib/libmyodbc5.so
|mysql||Database driver name.|
|Description||Database driver description.|
|Driver||Database driver library location.|
odbc.ini is used to define data sources:
[test] Description = MySQL test database Driver = mysql Server = 127.0.0.1 User = root Password = Port = 3306 Database = zabbix
|test||Data source name (DSN).|
|Description||Data source description.|
|Driver||Database driver name - as specified in odbcinst.ini|
|Server||Database server IP/DNS.|
|User||Database user for connection.|
|Password||Database user password.|
|Port||Database connection port.|
To verify if ODBC connection is working successfully, a connection to database should be tested. That can be done with the isql utility (included in the unixODBC package):
shell> isql test +---------------------------------------+ | Connected! | | | | sql-statement | | help [tablename] | | quit | | | +---------------------------------------+ SQL>
To enable ODBC support, Zabbix should be compiled with the following flag:
--with-unixodbc[=ARG] use odbc driver against unixODBC package
Configure a database monitoring item.
All mandatory input fields are marked with a red asterisk.
Specifically for database monitoring items you must enter:
|Type||Select Database monitor here.|
The unique description will serve to identify the item in triggers etc.
The data source name (DSN) must be set as specified in odbc.ini.
|User name||Enter the database user name (optional if user is specified in odbc.ini)|
|Password||Enter the database user password (optional if password is specified in odbc.ini)|
|SQL query||Enter the SQL query|
|Type of information||It is important to know what type of information will be returned by the query, so that it is selected correctly here. With an incorrect type of information the item will turn unsupported.|
ODBC error messages are structured into fields to provide detailed information. For example:
Cannot execute ODBC query: [SQL_ERROR]:[ERROR: syntax error at or near ";"; Error while executing the query] └───────────┬───────────┘ └────┬────┘ └──┬──┘└┬┘└─────────────────────────────┬─────────────────────────────────────┘ │ │ │ └─ Native error code └─ Native error message │ │ └─ SQLState └─ Zabbix message └─ ODBC return code
Note that the error message length is limited to 2048 bytes, so the message can be truncated. If there is more than one ODBC diagnostic record Zabbix tries to concatenate them (separated with
|) as far as the length limit allows.