How to import data from oracle database

Methods to import data into an Oracle database include: Using the SQL*Loader utility: Create a control file to define data format and load options. Use the SQL*Loader command to perform the import. Use the INSERT statement to insert data line by line.

Oracle Database Data Import

Importing data into an Oracle database is a critical task in data management to populate the database, update records, or repair corrupted data. There are several ways to import data, the most common method is to use the SQL*Loader utility or the INSERT statement.

Using SQL*Loader

SQL*Loader is a fast disk-based utility for batch loading data from flat files into a database. It uses control files to define data file formats and load parameters.

step:

1. Create control files, define data file layout and load options.

2. Use the SQL*Loader command to execute the import:

    <code>sqlldr userid=db_user/db_password control=control_file_name data=data_file_name</code>

   Use INSERT statements

The INSERT statement is used to insert data row by row into a database table. It provides more flexibility to insert dynamic values ​​or perform complex transformations.

step:

1. Create a target table to store data.

2. Write an INSERT statement that specifies the column name and the value to be inserted. Example:

    <code>INSERT INTO table_name (column1, column2) VALUES ('value1', 'value2');</code>

Other precautions

• Data type compatibility: Ensure that the data types in the data file are compatible with the column data types of the target table.
• Constraints and triggers: Oracle executes table constraints and triggers when importing data.
• Transaction: To ensure the integrity of the data, it is recommended to use transactions during the import process.
• Performance optimization: For large data sets, you can consider using multithreaded loading or parallel import techniques to improve performance.

The above is the detailed content of How to import data from oracle database. For more information, please follow other related articles on the PHP Chinese website!