What is Sqlldr 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.
How do you write a control 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.
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.
What is control file syntax?
Syntax of control files. A control file consists of one or more paragraphs of fields. 2 The paragraphs are separated by empty lines. Each paragraph consists of a series of data fields. Each field consists of the field name followed by a colon and then the data/value associated with that field.
How do I skip the last line in a CTRL file?
You can skip the header rows using the SKIP clause but to skip the last records you will have to use the WHEN clause. Typically, your trailing records (last records) will not be identical to the other records in the file and there should be an indicator to specify that this is a trailer record.
How do I read a control file?
Answer: To see the controlfile contents, use these steps: SQL> alter database backup controlfile to trace; We can now view the controlfile contents (as a “create database” statement) by looking for the latest file in the user_dump_dest directory.
How do I create a control file without backup?
To create a new control file:
- Start the database in NOMOUNT mode.
- Create the control file with the CREATE CONTROLFILE statement, specifying the NORESETLOGS option (refer to Table 18-2 for options).
- Recover the database as normal (without specifying the USING BACKUP CONTROLFILE clause): RECOVER DATABASE.
What is log file in SQL Loader?
When SQL*Loader begins execution, it creates a log file. The log file contains a detailed summary of the load. Most of the log file entries are records of successful SQL*Loader execution.
How do I run a SQL Loader in PuTTY?
Log on to redstart using SSH or PuTTY. To run the control files use the following command at the prompt: [[email protected] username]$ sqlldr sxxxxxx/password, control=filename.
What is 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. The current log sequence number. Checkpoint information.
How do I skip a header in SQL Loader?
Oracle > SQL*Loader One can skip unwanted header records or continue an interrupted load (for example if you run out of space) by specifying the “SKIP=n” keyword. “n” specifies the number of logical rows to skip.
How do I run SQL Loader?
To execute the SQL*Load tool, you need at least three files:
- The input data file stores delimited or raw data.
- The parameter file stores the location of the input/output files.
- The control file contains the specification on how data is loaded.