What is bad file in SQL Loader?

Specifying the Bad File. When SQL*Loader executes, it can create a file called a bad file or reject file in which it places records that were rejected because of formatting errors or because they caused Oracle errors.

What is filler in SQL Loader?

SQL LOADER lets to skip unwanted fields in the data file by using the “FILLER” clause. Filler was introduced in Oracle 8i. SQL LOADER also lets you load the same field into two different columns of the table. SQL LOADER again reads the first delimited field and skips it as directed by “FILLER” keyword.

What is a 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 command is used to invoke SQL Loader?

The command to invoke SQL*Loader is operating system-dependent. The examples in this chapter use the UNIX-based name, sqlldr . See your Oracle operating system-specific documentation for the correct command for your system.

What is the difference between bad file and discard file?

Bad file: The bad file contains rows that were rejected because of errors. 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.

How do I skip middle records in SQL Loader?

3 Answers. 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 ignore columns in SQL Loader?

1 Answer. Define the column you want to skip as FILLER. Keep in mind the order of the columns in the control file is typically the order they are in the datafile. If the name matches a column in the table, that’s where it will go.

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.

How do I increase errors in SQL Loader?

ERRORS (errors to allow) The default is 50. To permit no errors at all, set ERRORS=0. To specify that all errors be allowed, use a very high number. On a single table load, SQL*Loader terminates the load when errors exceed this error limit.

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.

How do I load a file using SQL Loader?

Following is procedure to load the data from Third Party Database into Oracle using SQL Loader.

  1. Convert the Data into Flat file using third party database command.
  2. Create the Table Structure in Oracle Database using appropriate datatypes.

What’s the maximum number of errors SQL * loader can allow?

ERRORS specifies the maximum number of insert errors to allow. If the number of errors exceeds the value of ERRORS parameter, SQL*Loader terminates the load. The default is 50. To permit no errors at all, set ERRORS=0. To specify that all errors be allowed, use a very high number.

Why is SQL loader complaining about the length of the field?

You have more than 4000 characters in the field, but you specify that it is 4000. This is why SQLLOADER is complaining. Extend the value of STR,STR2 and STR3 in the control file to exceed the maximum length of the field. SQLLOADER first loads the field and thereafter he tries the operator (your SUBSTR).

Why do we need a multitable loader in SQL?

SQL*Loader maintains the consistency of records across all tables. Therefore, multitable loads do not terminate immediately if errors exceed the error limit.

What does ” bad ” mean in SQL * loader?

BAD specifies the name of the bad file created by SQL*Loader to store records that cause errors during insert or that are improperly formatted. If a filename is not specified, the default is used. A bad file filename specified on the command line becomes the bad file associated with the first INFILE statement in the control file.