When is the redo log buffer written to the redo log file?
a. a transaction changes data.
b. the redo log buffer becomes one-third full.
c. a redo log group is archived.
d. the database starts up.

B)The redo log buffer becomes one-third full.

Explanation:Redo log buffer is the type of buffer file that is present for storing the changes that have been done in data. Database changes are the made goes in the records of the redo entries.the change of the buffer to the redo files is done when the buffer contains change records which are full till the one-third section, thus conversion takes place from the redo buffer to the redo files.

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explanation:

a macro is a tool that allows you to automate tasks and add functionality to your forms, reports, and controls. for example, if you add a command button to a form, you associate the button's onclick event to a macro, and the macro contains the commands that you want the button to perform each time it is clicked.