What is SQL Loader control file?
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. How SQL*Loader expects that data to be formatted.
What is bad file and discard file in SQL Loader?
Bad file: The bad file contains rows that were rejected because of errors. These errors might include bad datatypes or referential integrity constraints. Discard file: The discard file contains rows that were discarded because they were filtered out because of a statement in the SQL*Loader control file.
What is flat file in SQL Loader?
SQL Loader is the one which is very use full to load the data into the database from flat files (.txt, .csv, etc..,) and UTL_FILE is the one which is very use full to write the data from database to flat file (.txt, .csv, etc…,)
What is SQL Loader with example?
SQL Loader. SQL LOADER utility is used to load data from other data source into Oracle. For example, if you have a table in FOXPRO, ACCESS or SYBASE or any other third party database, you can use SQL Loader to load the data into Oracle Tables. SQL Loader will only read the data from Flat files.
Is SQL Loader an ETL tool?
But these tools typically can’t take advantage of the high-performance capabilities of the ETL tools, or the brand-specific loading tools, like Oracle’s SQL*Loader utility. They just do traditional database inserts either via ODBC or JDBC.
Why SQL Loader is faster than insert?
A direct path load is faster than the conventional path for the following reasons: Partial blocks are not used, so no reads are needed to find them, and fewer writes are performed. SQL*Loader need not execute any SQL INSERT statements; therefore, the processing load on the Oracle database is reduced.
What is log file in SQL Loader?
The log file contains a detailed summary of the load. Most of the log file entries are records of successful SQL*Loader execution. However, errors can also cause log file entries. For example, errors found during parsing of the control file appear in the log file.
What does Infile * Indicate in the control file?
The INFILE clause specifies the name of a datafile containing data that you want to load. See Specifying Datafiles. The BADFILE clause specifies the name of a file into which rejected records are placed.
How do I read a text file in PL SQL?
You can load the text file as:
- – SQL*Loader: This will read the text, line by line.
- – External Table: See these notes on Oracle external tables:
- – Use a program: You can read Oracle data with a Pro*C program.
- – Use utl_file: You can read a text file and load it into a table using PL/SQL with utl_file.
How do I get SQL Loader?
- Unzip and click on setup.exe.
- Select Type of installation as custom.
- “Use Windows built-in Account” Account option for Oracle Home user Selection Step.
- Select Installation Location as per your requirement.
- From Component Name please select Oracle Database Utilities.
- Complete the installation.
What is CTL file in Oracle?
Every Oracle database has a control file. A control file is a small binary file that records the physical structure of the database and includes: The database name. Names and locations of associated datafiles and online redo log files.
How do I create a CTL file?
Complete the following steps to create a new control file.
- Make a list of all datafiles and redo log files of the database. …
- Shut down the database. …
- Back up all datafiles and redo log files of the database.
- Start up a new instance, but do not mount or open the database: STARTUP NOMOUNT.