DC/UCF Concepts

LOG DATABASE Parameter
idms
To direct the system log to the DDLDCLOG area of the data dictionary, specify LOG DATABASE in the system generation SYSTEM statement.
Benefits of Using the DDLDCLOG Area
Logging to the DDLDCLOG area provides the following benefits:
  • The online version of the print log utility (online PLOG) can be used to display the current contents of the DDLDCLOG area at a terminal. Online PLOG is described in the
    CA IDMS System Operations section
    .
  • All or selected portions of the log can be printed while the DC/UCF system is executing.
  • The log can be archived while the DC/UCF system is executing.
  • A partially full log does not need to be archived when the system is shut down. The DC/UCF system begins writing to the unused portion of the DDLDCLOG area at each system startup.
Archiving the Log Area
Use the ARCHIVE LOG utility statement to archive the log from the DDLDCLOG area and the PRINT LOG utility statement to print all or selected portions of the log. Instructions on using the ARCHIVE LOG and PRINT LOG utility statements are provided in the
CA IDMS Utilities section
.
Monitoring Available Space in the Log Area
When logging to the DDLDCLOG area, the DC/UCF system monitors the available space in the area. When the amount of unused space in the area halves, the system sends a message to the operator's console indicating the percentage of used space in the area. The message is issued, for example, when the log is 50% full, 75% full, 88% full, and so forth.
Users can check the percentage of used space in the log at any time by issuing a DCMT DISPLAY LOG command. DCMT commands are described in the
CA IDMS System Tasks and Operator Commands section
.
When the DDLDCLOG area is 100% full, the system halts execution and waits for the log to be archived. Typically, the WTOEXIT user exit is used to automate the archiving of the system log. User exits are described in the
CA IDMS System Operations section
.