What term is used to record successful and unsuccessful access attempts

What are compression artifacts? 1) visible defects in the picture caused by the nature of the compression algorithm. 2) numbers that tell a web server how much to compress a picture for faster transmission. 3) invisible defects in the picture preserved by lossless compression. 4) numbers that tell a photo editing program how much to compress a picture for faster transmission.

What are procedures that keep a data base current

If a client wants to make minor edits, what should he/she use?