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- This is a product information page, containing details of the information that BMC Discovery gathers about a product and how it is obtained.
- Product Name
- Publisher Page
- Relational Database Management Systems
- TKU 2017-Mar-1
- Change History
- PostgreSQL RDBMS - Change History
- Reports & Attributes
- PostgreSQL RDBMS - Reports & Attributes
- Publisher Link
Extended Discovery pattern which allows to model Database Detail Nodes being managed by the PostgreSQL Server is available for this product.
PostgreSQL is a powerful, open source relational database system. It has more than 15 years of active development and a proven architecture that has earned it a strong reputation for reliability, data integrity, and correctness. It runs on all major operating systems, including Linux, UNIX (AIX, BSD, HP-UX, SGI IRIX, Mac OS X, Solaris, Tru64), and Windows. It is fully ACID compliant, has full support for foreign keys, joins, views, triggers, and stored procedures (in multiple languages). It includes most SQL92 and SQL99 data types, including INTEGER, NUMERIC, BOOLEAN, CHAR, VARCHAR, DATE, INTERVAL, and TIMESTAMP. It also supports storage of binary large objects, including pictures, sounds, or video. It has native programming interfaces for C/C++, Java, .Net, Perl, Python, Ruby, Tcl, ODBC, among others, and exceptional documentation.
Software Pattern Summary
|Product Component||OS Type||Versioning||Pattern Depth|
|DatabaseServer||UNIX||Active (command), File, Path, Package||Instance-based or grouped on command-line args (data dependent)|
|Windows||WMI Query, Active (command), File, Path, Package|
Platforms Supported by the Pattern
The current pattern identifies an instance of PostgreSQL Server running on both Unix/Linux and Microsoft Windows platforms.
Software Instance Triggers
Simple Identification Mappings
The following components/processes are identified using the combination of pattern definitions and simple identity mappings.
|PostgreSQL Database Server||regex '\bpostmaster$'|
|EnterpriseDB Postgres Advanced Server||regex '\bedb\-postmaster$'|
|PostgreSQL Database Server Control process||regex '(?i)\bpg_ctl\.exe$'|
|PostgreSQL Database Server||regex '\bpostgres:$'|
|EnterpriseDB Postgres Advanced Server||regex '\bedb\-postgres$'|
|PostgreSQL Database Server||regex '(?i)\bpostgres\.exe$'|
|PostgreSQL Scheduling Agent||regex '(?i)\bpagent\.exe$'|
|Postgres Enterprise Manager||regex '(?i)\bpem\.exe$'|
Version information for the product is currently collected using one of three possible methods. We execute the methods in order based on their accuracy, depth and reliability. Once a result is obtained, the method lower in precedence is not attempted. In order of precedence the methods are
WMI Versioning (Windows Only)
On the Windows platform only, the pattern attempts to obtain version information by executing the following WMI query against the root\CIMV2 namespace:
- SELECT Version FROM CIM_DataFile where Name='<trigger_process_cmd>'
Active Versioning - Command Execution
We have been able to identify one method to actively version this product. It provides a good level of reliability on both platforms and does not require special permissions.
The first step for active versioning is to determine whether the path of the trigger process is an absolute path as only in that case will active versioning be attempted.
This is performed as follows:
- regular expression used to match against the trigger process command: '^/'
- regular expression used to match against the trigger process command: '^\w:'
The Unix specific version command is running postmaster command with the full path to it and "--version" parameter.
The Windows specific version command is running pg_ctl.exe command with the full path to it and "--version" parameter.
|Executed Command:||<abs_path_to_binary>/postmaster --version||Unix|
|Executed Command:||<abs_path_to_binary>\pg_ctl.exe --version||Windows|
The output is parsed using the following regular expression:
If we are unable to fetch the version from a previous versioning method we will attempt to read the PG_VERSION file in the <postgres_data_path> folder and parse its contents against the following regular expression:
If we are unable to fetch the version from a previous versioning method we will attempt to parse the process's command line to see if we can identify any installation version from path using the following regular expression:
This approach usually returns a version if path was not altered much during installation
If the pattern is unable to extract the version from a previous versioning method then it will attempt to query the package management system to obtain the product version.
The pattern supplies the package query with a set of regular expressions to be checked for.
|(?i)^Postgres Plus Advanced Server|
This usually returns a version if PostgreSQL was installed from package on Windows or Unix.
Application Model Produced by Software Pattern
Following its startup, the PostgreSQL server will launch a number of worker processes which handle the various DB server functions
Software Pattern Model
The pattern triggers on postmaster or pg_ctl process (or edb-postmaster or edb-postgres in the case of an EnterpriseDB installation) since these processes shows that PostgreSQL is running.
The pattern then attempts to determine the port the DB server is listening on and uses this as part of the SI key If the key cannot be obtained, the pattern will create a grouped SI using the trigger process command-line arguments.
Finally, the pattern creates association links with processes related to the trigger process (child processes started by the main process)
The current Windows pattern trigger assumes that PostgreSQL is running as a service (expected in production environment)
Obtaining detailed PostgreSQL Database, Schema and Table information
A separate pattern has been created to query the PostgreSQL Server in order to obtain database list and (optionally) database table details. For more information about this pattern, please refer to the relevant page.
Subject Matter Expertise
Subject Matter Expert input will be welcome on any other potential approaches not discussed to improving product versioning coverage of PostgreSQL RDBMS especially with regard to EnterpriseDB installations.
Testing to ensure the processes related to PostgreSQL Database Server have been correctly identified and that the product can be versioned has been performed using Discovery record data as well as live discovery of hosts running Solaris, Linux and Windows operating systems.
There are no known open issues with this pattern.