Oracle imp and exp commands

Normally when i have to take a backup of of a database on unix, i do,

exp DBUSER/DBPSW@INST file=xxx.dmp

or load from a dump

imp DBUSER/DBPSW@INST file=xxx.dmp

my question here i开发者_运维技巧s :

1. how can we take a backup of a single table
2. how can we import the data backup from the dump into a single table.
3. how can we disable the constraints when taking a backup

I rarely do these when required.some times i need to do the above mentioned things but instead because i donot know i take the complete backup of all the table and load it. does anybody know how we can do it?

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You can list tables you want to export or import in your command line as 'tables=...' Or run exp/imp interactively and it will ask you for list of tables. Here is a good FAQ