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Creating a Transaction Log (TLOG) in the MACHINES Section
To create a TLOG, complete the following tasks:
The Universal Device List (UDL) is a map of the BEA Tuxedo file system. The UDL gets loaded into shared memory when an application is booted. The TLOG refers to a log in which information about transactions is kept until the transaction is completed. To create an entry in the UDL for the TLOG device, create a UDL on each machine using global transactions. (If the TLOGDEVICE is mirrored between two machines, it is unnecessary to do this on the paired machine.) The Bulletin Board Liaison (BBL) then initializes and opens the TLOG during the boot process.
To create a UDL, enter the following command before the application is booted.
tmadmin -c crdl -z config -b blocks
Note: The command fails if the device already exists.
The value of config must be the full path name of the device on which you create the UDL. It should match the value of the TLOGDEVICE parameter in the MACHINES section of the configuration file. The value of blocks must be the number of blocks to be allocated on the device.
Note: If the value of blocks is less than the value of TLOGSIZE, you risk a performance degradation. Therefore, you should specify a value for blocks that is greater than that of TLOGSIZE. For example, if TLOGSIZE is specified as 200 blocks, specifying -b 500 does not cause a degradation.
For more information about storing the TLOG, see Installing the BEA Tuxedo System.
Defining Transaction-related Parameters in the MACHINES Section
To define a global transaction log (TLOG), you must set several parameters in the MACHINES section of the UBBCONFIG file.
For one of these parameters, TLOGDEVICE, you must manually create a device list entry for the TLOGDEVICE on each machine where a TLOG is needed. You can do this either before or after TUXCONFIG has been loaded, but you must complete this step before the system is booted.
The following table describes the transaction-related parameters in the MACHINES section.
Creating the Domains Transaction Log
Before starting a Domains gateway group, you must create a Domains transaction log. Specifically, you must create a Domains transaction log for the named local domain on the current machine (that is, the machine on which DMADM is running). To create a log, enter the following command.
dmadmin crdmlog crdlog -d local_domain_name
The command uses the parameters specified in the DMCONFIG file. This command fails if the named local domain is active on the current machine or if a log already exists. If a transaction log has not been created, the Domains gateway group creates one when that group starts.
See Also
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