I am trying to create db link from Oracle 11g to SQL Server 2005 using DG4MSQL gateway.
After creating db link I am not able to query SQL Server system views (sys.services or sys.objects) using JDBC driver, but I am able to query all user tables using JDBC driver.
If I use sqlplus, I am able to query all tables including system tables. Since my project is Java project, I am bound to use JDBC driver.
One more observation I made is that, if I use DG4ODBC instead of DG4MSQL gateway, then I am able to query all SQL Server tables including system tables using JDBC driver.
Please let me know if there are any ways I can query SQL Server system tables using DG4MSQL and JDBC driver?
this one is a little bit tricky to explain
An Oracle Gateway performs 3 types of operations:
SQL translations (when you query regular tables, views etc)
Data Dictionary translations (when you query system views)
Data Type transformations (for example Microsoft's date to Oracle's date)
In case of JDBC, the JDBC-ODBC bridge makes the JDBC driver perfectly compatible with the drivers included in DG4ODBC. Therefore, JDBC plus DG4ODBC allows you to perform all the transformations above.
The problem is that DG4MSQL uses a proprietary driver and only SQL translations can be bridged to JDBC.
As a solution to your issue, you could try to create local views on your Oracle schema, based on the remote SQL server system views. Depending on your requirements, you can even create them as materialized views.
CREATE OR REPLACE VIEW sys_services
AS SELECT *
FROM sys.services#dblink;
and then query sys_services instead of directly querying sys.services#dblink
Related
Data was sent to our company with PostgreSQL, but we are prohibited to use the tools of PostgreSQL , permitted the use of only Oracle.
How to migrate data from PostgreSQL to Oracle without using a third party application(they are also prohibited)? You can only use the tools of Oracle.
I found this article https://support.oracle.com/knowledge/Oracle%20Database%20Products/2220826_1.html but we don't have Support Identifier
We have one .sql file. It weighs 8 Gigabytes.
It looks like you have so many impediments in your company. Regarding Oracle's SQL Developer Migration Workbench, unfortunately it does not support the migration of PostgreSQL databases. However, the following 3rd-party software tools are available and may assist in migration, but I am afraid you cannot use them as you said that those products are forbidden:
http://www.easyfrom.net/download/?gclid=CNPntY36vsQCFUoqjgodHnsA0w#.VRBHKGPVuRQ
http://www.sqlines.com/postgresql-to-oracle
Other options will only move the data from your Postgresql database to Oracle database, it means that you must have the DDLs of the tables before to run the import:
To move data only, you can generate a flat file of the the
PostgreSQL data and use Oracle SQL*Loader.
Another option to migrate data only is to use Oracle Database
Gateway for ODBC which requires an ODBC driver to connect to the
PostreSQL database, and copy each table over the network using
sqlplus "COPY" or "CREATE TABLE AS SELECT" commands via oracle
database link.
Also, Oracle has discussion forum for migrating non-oracle databases to Oracle.
http://www.oracle.com/technetwork/database/migration/third-party-093040.html
But, if you have only a sql file, you should look at it to see whether you have both DDLs ( create tables and indexes, etc ) and the data itself as insert statements. If so, you need to split it and treat the DDLs to convert the original data types to Oracle datatypes.
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.
We have two divisions in our company, one uses E1 on Oracle 11g the other uses SAP on Oracle 11g.
We also have a SQL Server system we use to data warehouse information once a night from both system to run our report server against.
The question I have is for pooled tables in SAP, such as A016, how would I get that information out of SAP?
Currently we have SSIS's setup with a linked server to the two Oracle servers which pull the data we need I just don't have the knowledge of SAP to find the Pooled tables.
if I can't pull the pooled tables because they don't physically exist is there a tool I can use in SAP to find out what tables the pooled table is getting it's information from? This way I can rebuild that table in SQL using a open query and some fun Joins.
Thanks
You have to access those tables using the application server. They can't be accessed directly from the database.
You'll probably want to write an ABAP program to extract the data you need go from there.
I have a PostgreSql database and I need to connect it to read data from oracle view and store that data in custom table
The PostgreSql database will connect to oracle everyday automatically to read the latest updates from oracle view
How to create it?
It sounds like you probably want a SQL/MED foreign data wrapper. Check out oracle_fdw. You could also use the generic odbc_fdw or jdbc_fdw wrappers via Oracle's ODBC or JDBC drivers.
Another option is DBI-Link.
Combine these with a cron job if you want to copy to a local view.
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.