What is the oracle import process?

Oracle database is a very popular relational database management system. It has an efficient data processing and storage engine and can be used to store, manage and process large amounts of data. For businesses and organizations, it is often necessary to import data from external data sources into Oracle databases for deeper analysis and operations. This article will introduce the import process in Oracle database to help users better understand the use of the database.

1. Data import type

Before proceeding with the import process, you need to determine the data type to be imported. In Oracle Database, you can import many types of data, including table structures, data, triggers, stored procedures, and other related objects. Therefore, before importing data, you need to clarify the data type to be imported in order to perform correct operations.

2. Preparations before importing

Before importing data, some preparations need to be done to ensure that the import process can proceed correctly. The following are some things to note:

1. Confirm the source of imported data and the data format.
2. Confirm the permissions required to import data.
3. Confirm the target database for data import.
4. Prepare the necessary import tools and database connection information.
5. Before importing data, you need to back up the database to avoid irreversible data loss.

3. Use SQL Developer to import data

Oracle DataBase 12c provides SQL Developer tools to import data quickly and easily. The specific steps are as follows:

1. Open the SQL Developer tool and connect to the database.
2. In the "Import" option bar, select the type of data to import (such as table structure, data, etc.).
3. Enter the file path to which data needs to be imported.
4. Click "Import" and wait for the import process to complete.

4. Use SQL Loader to import data

SQL Loader is a command line import tool that can be used to import large amounts of data. The following are the steps to use SQL Loader to import data:

1. Create a control file and specify the file path and data format to be imported.
2. Use the SQL Loader command to perform the import operation.

The following is an example of a control file:

load data

infile 'data.csv' --Specify the path to the data file

replace into table my_table --Specify the table name to be imported

fields terminated by ',' optionally enclosed by '"' --Specify the field delimiter of the data

trailing nullcols --Specify null Value processing method

(my_col1, my_col2, my_col3) --Specify the columns to be imported

Note: The field separator and null value processing method can be changed according to needs.

Next, run the following SQL Loader command to perform the import operation:

sqlldr username/password control=control_file_name.ctl

Note: username/password is the database login information, control_file_name.ctl is the previous step The name of the created control file.

5. Use Oracle Data Pump to import data

Oracle Data Pump is an efficient data import tool that can quickly and reliably import large amounts of data. The specific steps are as follows :

1. Use the expdp command to export the data to be exported to a file.

expdp username/password@connect_string tables=my_table directory=exp_dir dumpfile=my_file.dmp logfile =my_log.log

Note: username/password is the database login information, connect_string is the database connection information, tables specifies the table name to be exported, directory specifies the path where the export file is located, dumpfile specifies the file name of the export file, logfile specifies the log file name of the export process.

2. Use the impdp command to import the exported data into the database.

##impdp username/password@connect_string directory=exp_dir dumpfile= my_file.dmp logfile=my_log.log

Similarly, username/password is the database login information, connect_string is the database connection information, directory specifies the path where the export file is located, dumpfile specifies the file name of the import file, and logfile specifies the import process. The name of the log file.

6. Summary

Data import is one of the important operations of Oracle database, which can help enterprises and organizations better manage and analyze data. Before importing data, you need to determine the data type, make preparations, and select the corresponding import tool for the import operation to ensure the correctness of the operation and the integrity of the data. In daily work, you need to continuously learn and update your database operation skills and improve your skill level.

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