Can you selectively load and modify the data as the database gets loaded?
Can one modify data as it loads into the database? Data can be modified as it loads into the Oracle Database. Note that this only applies for the conventional load path and not for direct path loads.
Which two statements are true about using SQL * Loader?
It can load data from external files by using the direct path only. C. It can load data into one table at a time.
What is SQL * Loader?
SQL*Loader loads data from external files into tables of an Oracle database. It has a powerful data parsing engine that puts little limitation on the format of the data in the datafile. You can use SQL*Loader to do the following: Load data across a network.
Why SQL Loader is faster than insert?
SQL*Loader is the more efficient method. It gives you more control. You have an option do DIRECT load and NOLOGGING , which will reduce redo log generation, and when indexes have been disabled (as part of direct loading), the loading goes faster. Downside, is if load is interupted, indexes are left unusable .
Is there a SQL * Unloader to download data to a flat file?
Unfortunately, the company doesn’t. Oracle does provide SQL*Loader, a utility that can load data into Oracle from almost any form of flat file, but there is no corresponding SQL*Unloader.
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.
What is CTL file in Oracle?
Every Oracle Database has a control file, which is a small binary file that records the physical structure of the database. … Names and locations of associated datafiles and redo log files. The timestamp of the database creation. The current log sequence number. Checkpoint information.
What is bad 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.
Is SQL Loader an ETL tool?
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.
How do I start 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.
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.