What happens in the background of a 'sqlldr' execution? How does it connect to the database? Is it using ODBC?
sqlldr is Oracle’s data loader utility. In general, the SQL*Loader client utility loads data into a
database at the same release level or higher.
For learning purpose change/remove the PATH environmental variable and then run the sql loader.
Like sqlplus, expdp, impdp the sqlldr utility is an OCI (Oracle Call Interface) application that uses Oracle Net (formerly called "SQL*Net" or "Net8") to connect and communicate with the database. No odbc nor jdbc.
Related
Is there a way to work with SQL Loader for a PostgreSQL database or is it for Oracle Databases only?
SQL*Loader is an Oracle utility that uses an oracle client/oracle call interface to talk to an Oracle Database ONLY.
I have only used db links to get access to remote db so far. Now I have to find a way to use JDBC to connect to remote db and get data. Can someone guide me what all things would I need to ask the remote db admin in order to setup a jdbc connection, and once I have the connection, how do I query the database using java stored procedure, just like I am querying it over remote db right now with db link?
You've described a fairly complicated problem, but haven't given any information about your database or operating system. Are you connecting to a SQL Server database? MySQL? Are you running on Linux? Windows?
First, you'll need a driver. That's going to depend on the database, operating system and versions thereof that you're using. For example, here is the Microsoft ODBC Driver for SQL Server (Oops, looks like it's currently unavailable.)
Second, you need to set up Oracle Heterogenous Services. That's fairly complicated and not something I can answer here. You might start with the Database Gateway for ODBC User's Guide.
Oracle does have gateways for various other databases, but they're licensed additionally from the database itself.
What is the Difference Between Oracle lnstant Client and Oracle Client ? Could you explain me ? Thanks
Oracle client comes with an installer and a lot of executable like
sqlplus, tnsping, it's complete and huge.
Oracle Instant client is a basic lightweight client which can be
unzipped in a location without any installation, it contains only the
communication layer to be able to connect to oracle. It can be
extended by adding for example sqlplus which ships as a separate
executable. When using Instant Client, just unzip it to a location,
set your ORACLE_HOME environment variable to this location and you
are ready to go.
In the context of a mainframe rehosting project (from z/OS to Linux), we are planning to migrate DB2 z/OS to Oracle.
Currently, several Windows applications uses DB2 connect DDF/DRDA to access to DB2 z/OS data (through ODBC, JDBC).
Will it be necessary to use Oracle Database Provider for DRDA for these applications ?
Or can we simply use normal ODBC / JDBC Oracle drivers and adapt the code ?
Thanks.
You can use normal Oracle drivers (if you want your Windows odbc/jdbc applications) to access Oracle on Linux. Yes you may need to adapt some of the code and of course the connection strings. You don't need DB2-connect unless you want some applications to continue to use type-2 drivers to access DB2 on Z/OS.
I want to know if is there a way of change the driver used by Microsoft Access to extract data (only use select like querys) from Oracle 9i data base.
The Access to Oracle connection is made using an external data source (linked table) and usually the default Access driver is ODBC for ORACLE, but I want to change that and use a JDBC driver for ORACLE instead.
Thanks in advance.
The Access to Oracle connection is made using an external data source (linked table) and usually the default Access driver is ODBC for ORACLE, but I want to change that and use a JDBC driver for ORACLE instead.
I'm fairly certain that this is impossible. Access linked tables connect via Jet/ACE (for links to another Access database), or ODBC (for all other data sources). JDBC is not an option.