Exclusive Oracle database tool: SQL * Loader

SQL * Loader is a data migration tool provided by the Oracle database system. It provides a command line method that allows you to load a large amount of data into the Oracle database in batches. Although both the Oracle database and the SQL Server database provide graphical interface import tools, the graphical interface has a major disadvantage, that is, it cannot be directly referenced by foreground programs. The command line import module can be directly called by the foreground application. This is also one of the reasons why SQL * Loader becomes one of the most common tools in the Oracle database system.

SQL * Loader has the following advantages:

First, it can be directly called by the foreground application. For example, the open-source COMPIERE enterprise management application system uses the Oracle database system. In the COMPIERE application system, data import is a powerful function. It can not only import data according to the existing template, but also customize the import format. This is very useful when the system imports basic data. However, the development of this function is really simple, because it basically calls the SQL * Loader module in the background database system directly. The command line mode import module can be directly called by foreground applications, which is its biggest advantage.

Second, you can import a large amount of data from an existing file. Using the SQL * Loader tool, you can import a large number of records from an existing file, such as a comma delimiter file or a fixed-width file, to the Oracle database system according to certain rules. The import efficiency is much higher than the graphic interface.

Third, multiple data files can be merged into one file. We all know that in Oracle databases, the data required by a database application can be stored in multiple data files to achieve high database performance and high database security. However, sometimes we may need to combine these data files into one. At this time, we can use the SQL * Loader tool to merge them.

Fourth, repair and detach bad records. Sometimes, the data to be imported may conflict with the data table in the Oracle database system, resulting in data import failure. If the data field to be imported is too long and exceeds the maximum length limit of the data table, data import may fail. Using the SQL * Loader import tool, you can separate the records that do not comply with the rules and store them in an independent file. Data that meets the rules can be imported normally. In this way, the data import accuracy can be improved.

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