| Subject | English | Welsh |
| comp., MS | log entry | cofnod log (A record in a log file) |
| comp., MS | log file | ffeil cofnodi (A file that stores messages generated by an application, service, or operating system. These messages are used to track the operations performed. Log files are usually plain text (ASCII) files and often have a .log extension) |
| comp., MS | log level | lefel log (The amount of information that is stored in a log file for a transaction. Log levels can be represented by numbers or by words from the most to the least verbose) |
| comp., MS | Log Level Manager | Rheolwr Lefel Log (A Project Server logging infrastructure that improves efficiency by enabling admins to customize logging levels for project entities) |
| comp., MS | log off | ymadael (To terminate a session with a computer accessed through a communications line usually a computer that is both distant and open to many users) |
| comp., MS | log on | mewngofnodi (To gain access to a specific computer, program, or network by identifying oneself with a username and a password) |
| comp., MS | search query log report | adroddiad log ymholiadau chwilio (A report that is generated from query log information. For example, a search query log report might include the number of queries that were executed every day over the past thirty days) |
| comp., MS | tail-log backup | log gweddillion wrth gefn (A log backup taken from a possibly damaged database to capture the log that has not yet been backed up. A tail-log backup is taken after a failure in order to prevent work loss) |
| comp., MS | transaction log file | ffeil log trafodyn (A file that contains a record of the changes that were made to an Exchange database. All changes to the database are recorded in the transaction log files before they are written into the database files. If a database shuts down unexpectedly, unfinished transactions can be restored by replaying the transaction log files into the database) |