This diagram visually explains the concept of peer-to-peer replication. See Configure replication to maintain multiple peer databases for more information.
SharePlex uses the following environment variables, which you may need to set in certain situations. Usually you must perform additional steps before or after setting a variable, so refer to the recommended instructions before setting a SharePlex variable.
|EDITOR||Sets the default ASCII text editor for sp_ctrl commands that use one, for example the create config command. See Set a default editor for sp_ctrl.|
|HOST||Sets a host name for all locally run sessions of sp_ctrl. To set a per-session host, see Execute commands in sp_ctrl.|
|SP_COP_TPORT||Sets a non-default port number for an instance of SharePlex. The default port number is 2100. You may need to set a different port number if you are setting up additional instances of sp_cop (see Run multiple instances of SharePlex) or if a different port number than 2100 must be used (see Set the SharePlex port number).|
|SP_SYS_HOST_NAME||Sets the virtual IP address (also known as the global cluster package name) on a clustered system, such as Oracle RAC. This variable must be set on all cluster nodes. For more information about configuring SharePlex in a cluster, see the SharePlex Installation Guide.|
|SP_SYS_VARDIR||Sets the full path to the SharePlex variable-data directory so that sp_cop can locate the configuration data, queues, logs and other information. If there is only one instance of sp_cop on the local system, this variable is set by default*. If there are multiple instances of sp_cop on the local system, always set this variable to point to the correct variable-data directory of an instance before setting any other SharePlex variables for that instance. For more information, see Run multiple instances of SharePlex.|
Suppresses the output of the compare and repair SQL log file for all compare and repair runs while the current instance of SharePlex is running. This variable must be set before starting SharePlex, so if the sp_cop process is running it must be restarted after setting this variable. When sp_cop is run with this environment variable, the compare and repair commands will not put data into SQL files and the Post process will not put data into the SharePlex error log.
* On Unix and Linux, the variable-data directory is set in the proddir/data/defaults.yaml file. On Windows, it is set in the Windows Registry.
To set an environment variable in Unix or Linux
setenv variable_name value
setenv SP_SYS_VARDIR full_path_of_variable-data_directory
To set an environment variable on Windows
Set the environment variable by adding it to the SharePlex node of the Windows Registry.
Important! Incorrect Registry settings can adversely affect the operation of SharePlex. Consult a System Administrator if you need help with this procedure.