Which of the following is true about log files? select one: a. they aid in database roll back b. they should be stored on the same physical disk as data files c. there can be only one log file per database d. log files are optional for each database

answer:

c hope this

explanation:

to change your username, you must:

1) make sure what the username you want to change to is allowed in this community

2) contact a administrator (for example, jaysl)

3) through pm, tell the admin what you want to change to

4) if the username is allowed, it will be changed in a matter of seconds (minutes at most)

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