All language subtitles for [SubtitleTools.com] Data Pump Import - Learning Oracle 12c [Video]

In this lesson, we're going
to look at data migration

using Data Pump Import.

So Data Pump Import
is the partner tool

to Data Pump Export.

So data is exported, or
taken out of the database,

into files using Export.

And Import will take
it from the file

back into a table
in the database.

So again, we used
to use an older tool

to import data, the
imp command line

tool, that could import
data that had been exported

using the exp tool.

But starting in 10g,
Oracle recommends

the use of Data Pump Import.

And primarily, because it
has a number of different

features, and it can be up to 15
times faster in importing data.

It also has a
number of features,

such as compression, encryption,
some important things that we

can use that are important
when we migrate data

from one place to another.

It's also important to note that
Data Pump Import and Export are

also integrated with tools such
as Oracle Enterprise Manager

and can be accessed from
the GUI using those tools.

So let's take a look
at what we have here.

We already have
some exported files.

In order to run
Data Pump Import,

we're going to
create a parameter

file that will specify how
we want the data imported.

So to verify
something here first,

let's log in as Scott and
select star from dept_copy.

So we have no table called
dept_copy at this point.

What we're going to do is
we're going to import data

from the dump file that was
dumped out of the DEPT table

into a table called dept_copy.

So we need to construct
our import parameter file.

I'm just going to create a text
file here called dept_imp.par.

So let's add some commands here.

User ID will be Scott.

The directory object we're
using will be dept_external.

The dump file we'll
specify as dept_exp01.dump.

Notice that we have
that file right here.

It contains the data
from the DEPT table.

Logfile will be dept_imp.log.

And here's the key.

We're going to say remap_table
equals scott.dept:dept_copy.

Every reference there
is in this dump file

to the scott.dept
table will now be

mapped to a new table
called dept_copy.

Save and close this.

And in order to invoke our Data
Pump Import tool, we use impdp.

parfile will be dept_imp.par.

So that is our dept_imp
parameter file, and hit Enter.

And notice that it imports the
scott.dept_copy table and puts

four rows.

So let's take a look,
if we can see the data.

Select star from dept_copy,
which if you recall

did not exist before
we ran our import.

And there is the data.

Let's look at one more thing.

What would happen if
we ran this again,

if it was our intent to load the
same data into the table again?

Notice that it says,
completes with 1 error.

And it says the table
scott.dept_copy exists.

And so it says any
dependent metadata

and data will be skipped.

So if we want to do
something like that, as load

the data again, we need to make
a modification to our parameter

file.

We're just going to
add, table_exists_action

equals append.

So there is a number of
different table_exists_action

commands that we can
use-- append, truncate,

a number of different ones.

So we want to append that
data into the table again.

We'll save it, and run our
Data Pump Import again.

Again, we're importing data from
that dump file into the table.

It says it's completed
successfully.

Let's log in as Scott, do a
select star from dept_copy.

And then notice that the
data was imported again.

So that's how we
can use Data Pump

Import to leverage data
migration in an Oracle

database.