Provides the information required to build the EDB PostgreSQL RM switch module.
Restriction: This topic applies only when the Enterprise Server feature is enabled.
Note: This is a technology preview feature only. It is being made available to allow you to test and provide feedback on this new
capability; however, this feature is not intended for production use and it is not supported as such. Furthermore, Micro Focus
does not guarantee that this feature will be delivered at a GA level and if it is, then the functionality provided might differ
considerably from this technology preview.
The EDB PostgreSQL module provides two-phase commit support using PostgreSQL-provided SQL calls, and ensures that any database
connections made using this switch module all participate in a single XA transaction.
PostgreSQL Server configuration for XA
Important: Before you can use the EDB PostgreSQL RM Switch Module, you must configure the PostgreSQL Server by changing the value of
the max_prepared_transactions property from its default value of 0 (zero) to a value greater than 0. After making this change,
you must restart the server before proceeding. For additional details about the max_prepared_transactions configuration property,
see your PostgreSQL documentation.
- Source Code
- The EDB PostgreSQL RM switch module COBOL source file,
ESPGSQLXA.CBL is located by default in the
$COBDIR/src/enterpriseserver/xa directory.
Note: If you prefer to supply user credentials programatically rather than in the xa_open string, instructions for doing so are
provided in the COBOL source file in the
Customization section.
- Build Requirements
- The build script uses the current effective working mode to determine how to build the switch module.
- Building the Switch Module
- The
$COBDIR/src/enterpriseserver/xa directory contains the
build script file that you can use to build the switch module.
- Copy all files from the
$COBDIR/src/enterpriseserver/xa directory (default location) to any location where you have WRITE permission.
- Change to the directory containing the copied files.
- Enter
build pg
- Build Output
- The build process produces four binary RM switch module files from the
ESPGSQLXA.CBL COBOL source file:
| ESPGSQLXA.so |
32-bit |
dynamic |
| ESPGSQLXA64.so |
64-bit |
dynamic |
| ESPGSQLXA_S.so |
32-bit |
static |
| ESPGSQLXA64_S.so |
64-bit |
static
|
You can register an RM switch module with
Enterprise Server dynamically, or register it statically depending on which binary file you use. We recommend that you use the dynamic switch
module option, as this ensures that only active databases used in the global transaction participate in the TM/RM XA flow.
- Additional Resources
- For more information on using the EDB PostgreSQL RM switch module, including the xa_open string definition, see
EDB PostgreSQL xa_open string.