Answer:to add a column to existing table.
to rename any existing column.
to change datatype of any column or to modify its size.
to drop a column from the table.
Explanation:
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Answer:
Explanation:
When you have a single copy, a large number of concurrent updates that are supposed to go to a file may result in the user obtaining incorrect information. This incorrect information obtained them leads to the file being left in an incorrect state. When you have a lot of or multiple copies, then storage waste exist and the various copies might happen not to be consistent with respect one other. In summary, what happens is that
a) Using one copy saves space, but also the change might have an effect on all the users.
b) Using multiple copies avoids eliminates the change problem, while creating its own problems, using more space.
<u>Attempt to connect via Telnet or SSH for enable mode:</u>
- Normally telnet and SSH ism to used login to network socket. Basically to login user is prompted with password and verified.
- Secret password is one more level to login to access the network.
- It is used to login copy files to web server so that website pages are update. End user can copy or move the files from web server or cloud computer or UNIX servers.
- Enable secret password if it is configured, end user login with encrypted technology and plain text format is displayed.
- Different between enable secret and enable password is enable secret is encrypted and enable password is not encryption and plain text.
