exp utility

When we user exp utility. It is asking for user name and password.
Could you tell me what is that? How can I create  or obain?
Thanks
nobleitAsked:
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OP_ZaharinConnect With a Mentor Commented:
if you are using sys user you need put the sysdba and put a single quotes around it:

c:> exp 'sys/sys as sysdba'
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MrNedCommented:
Its the username/password of the user you want to connect with to perform the export. Default users are SYS or SYSTEM, or you can create your own users with access to specific tables. To create users: http://download.oracle.com/docs/cd/B19306_01/server.102/b14200/statements_8003.htm#SQLRF01503
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nobleitAuthor Commented:
For some reason I cannot to exp user name and password are prompted.
user sys has password sys.
I tried it did not work out.
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nobleitAuthor Commented:
Is is asking like this:

Enter array fetch buffer size:4096  >
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MrNedCommented:
It is asking you for settings to use during the export. I suggest you read the document: http://download.oracle.com/docs/cd/B19306_01/server.102/b14215/exp_imp.htm
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OP_ZaharinCommented:
Enter array fetch buffer size:4096  >

nobleit - thats mean u already connected to the export utility using the command I supplied. next you need to choose carefully your options:

- array buffer – to specifies the size (in bytes) for the buffer used to fetch the rows. the default is 4096, and you can simply press <enter> to accept and continue.

- file - type the full path where you want the dump file to be created. eg: c:\temp\orabckp.dmp

- compress – if “Y”, export will mark the table to be loaded as one extent. i would simply choose Y

- constraints – [Y] specifies exporting constraints. key-in Y.

- grants - [Y] exporting grants into the export file. key-in Y.

- alternatively, you can specify the options in one line:
exp sys/sys FULL=y FILE=c:\temp\dba.dmp LOG=c:\temp\dba.log CONSISTENT=y

- read more here: http://download.oracle.com/docs/cd/B10501_01/server.920/a96652/ch01.htm
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johnsoneSenior Oracle DBACommented:
Be careful when choosing COMPRESS=Y.  In a large database it probably will not work when you try to import it.

Take this example.  You have a table where the sum of all extents is 40G.  With COMPRESS=Y, when the imp process tries to create that table it will try to create it with an initial extent of 40G.  You probably don't have a single datafile with that much free space in it, so the create will fail.

Also, if there are a lot of free space that will be taken out of the table when imported, the COMPRESS=Y will leave a lot of free space in the allocated extent.  You can deal with this and remove that extra space, but you need to be aware it can happen.
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