Contents
What is a control file in SQL Loader?
Control File Contents. The SQL*Loader control file is a text file that contains data definition language (DDL) instructions. DDL is used to control the following aspects of a SQL*Loader session: Where SQL*Loader will find the data to load.
What are the different types of files used in SQL Loader?
This release of SQL*Loader supports loading of four LOB types:
- BLOB: a LOB containing unstructured binary data.
- CLOB: a LOB containing character data.
- NCLOB: a LOB containing characters in a database national character set.
- BFILE: a BLOB stored outside of the database tablespaces in a server-side operating system file.
How do I create a control file in SQL Loader?
To create the SQL*Loader control file, use a text editor such as vi or xemacs. create. In general, the control file has three main sections, in the following order: Session-wide information.
What is replace in SQL Loader control file?
(c) REPLACE: Specifies that, we want to replace the data in the table before loading. Will ‘DELETE’ all the existing records and replace them with new. (d) TRUNCATE: This is same as ‘REPLACE’, but SQL*Loader will use the ‘TRUNCATE’ command instead of ‘DELETE’ command.
What is direct path load in SQL Loader?
The direct path loader (direct=true) loads directly into the Oracle data files and creates blocks in Oracle database block format. To prepare the database for direct path loads, the script $ORACLE_HOME/rdbms/admin/catldr. sql. sql must be executed.
What is CTL file in SQL?
SQL loader control file is used to load data from CSV or flat data file to Oracle tables. It usually has extension . ctl. In the control file, we define the structure for the data file and the target table in which we want to load data with some conditions.
What do you need to know about SQL loader control file?
The SQL*Loader control file is a text file that contains data definition language (DDL) instructions for a SQL*Loader job. Successfully using a SQL*Loader control file requires an understanding of the following topics: You can also use SQL*Loader without a control file; this is known as SQL*Loader express mode.
What is the DDL syntax for SQL loader?
SQL*Loader’s Data Definition Language (DDL) SQL*Loader’s Data Definition Language (DDL) Syntax Diagrams Expanded DDL Syntax SQL*Loader’s Control File: Load Configuration Control File Basics Comments in the Control File Specifying Command-Line Parameters in the Control File Specifying Filenames and Objects Names
Can a discard file be created in SQL * loader?
During execution, SQL*Loader can create a discard file for records that do not meet any of the loading criteria. You can specify a NULLIF clause at the table level. You can specify certain datetime formats at the table level in a SQL*Loader control file.
How to specify field order in SQL * loader?
Specifying Field Order You can use the FIELD NAMES clause in the SQL*Loader control file to specify field order. Specifying Data Files To specify a data file that contains the data to be loaded, use the INFILE keyword, followed by the file name and optional file processing options string.