The Dump Unload/Load utility, dul, saves and restores system dump tables.
If an Advanced SQL Engine failure occurs, the system automatically saves the contents of the affected AMP and its associated PE in a system-generated “dump table.” The information in these tables can be used to determine the cause of a system failure. Use dul to load the dump tables to disk.
Before you can use dul, the associated packages must be installed on Advanced SQL Engine.
The dul utility:
- Transfers dump information from Advanced SQL Engine to file. This unload operation is normally performed at the customer site, where the crash dump information is transferred to the Teradata Support Center for analysis.
- Is used by Teradata Support Center personnel to restore the dump information to a Support system for analysis.
- Can be used to drop tables and obtain summary information about dumps without performing a load or unload operation.
Tables containing crash dump information are named according to the following syntax:
- Year, month, and day.
- Hour, minute, and second.
- Sequence number, which is increased by one for each dump saved.
Dul can unload dump tables having any name.
Dul automatically saves unloaded dumps to a file with a compressed, gzip file format, and adds a .gz extension to the dump file name. When loading dumps, dul looks for the specified file name including a .gz extension. If that file is not found, dul looks for the specified file name without a .gz extension.