I have DB Oracle in two clients independently with the same structures.
and I want to transfer data from each client to Central DB Oracle with new PK and FK for each one With the consistency of data in each data base according to sequences in Central DB.
Is there any tools in oracle DB or solution to doing this.
Related
I create a DB(Supabase) and then I made tables on Supabase PostgreSQL DB and build their relations. Now we connect DB to budibase app.
Now we get data from DB but when we fetch data from DB. It Creates connections but it would not create relations between tables. Also, change column dataType.
Screen Short of Supabase DB Tables
Screen Short of Budibase where we fetch DB
I'm working with Neo4j for a family tree, It works fine but I just use the fake data, the real data is being stored in the Oracle database and I want to transfer data from Oracle to Neo4j. For each row in the Person table, there is a node in Neo4j.
Neo4j and APOC procedures support ingesting data via a JDBC driver. Check out more in the documentation. If you have lots of data you want to wrap the procedure in apoc.periodic.iterate for batching purpose like:
CALL apoc.periodic.iterate(
'CALL apoc.load.jdbc("jdbc:mysql://localhost:3306/northwind?user=root","company")',
'CREATE (p:Person) SET p += value',
{ batchSize:10000, parallel:true})
RETURN batches, total
Is there a way to replicate data(like triggers or jobs) from oracle tables to postgres tables and vice versa(for different set of tables) without using external tools? Just one way replication for both the scenarios.
Just a hint:
You can think of create a DB link from Oracle to Postgres which is called heterogeneous connectivity which makes it possible to select data from Postgres with a select statement in Oracle.
Then use materialized views to schedule and store the results of those selects.
As you don't want to use any external tool otherwise the solution should have been much simpler
for 20 tables I need to replicate data from oracle to postgres. For 40 different tables, I need to replicate from postgres to oracle.
I could imagine the following setup:
For the Oracles tables that need to be accessible from Postgres, simply create foreign tables inside the Postgres server. They appear to be "local" tables in the Postgres server, but the FDW ("foreign data wrapper") will forward any request to the Oracle server. So no replication required. Whether or not this will be fast enough depends on how you access the tables. Some operations (WHERE clause, ORDER BY etc) can be pushed down to the Oracle server, some will be done by the Postgres server after all the rows have been fechted.
For the Postgres tables that need to be replicated to Oracle you could have a similar setup: create a foreign table that points to the target table in Oracle. Then create triggers on the Postgres table that will update the foreign table, thus sending the changes to Oracle.
This could all be managed on the Postgres side.
I couldn't find a declarative way to store typical privs like SELECT, INSERT, UPDATE in table definition (in Relational Model) of Oracle SQL Developer Data Modeler 19.2. I can places SQL GRANT into Table Properties -> Scripts -> After Create, but prefer more suitable way.
You don't do it in the Relational Model, you do it in a physical model - to a specific kind of database, in this case, a 12c Release 2 database.
It's at the physical level that you start to worry about things like storage properties, encryption, compression, partitions, and security (grants).
I would like your opinion about usage of dblinks in oracle.Below are the points about my database architecture.
One centralized database [Database1]
Inside centralized database i have only 1 schema(central) ,which contains a table X
One OLTP database [Database2]
Inside Database2 , i have multiple schemas ,which contain same table X with different volumes of data.
I have create multiple private database link(non shared) from Database1 central schema to different schema(100 count) in Database2 to fetch data from table X(based on some sync flag) to central table X
I have written simple procedure that run every 10 seconds in central schema(Database1) to connect each schema in Database2 to copy X into central X table
Question -
I am closing Db links after each connection, but will this lead to any kind of db links issue, if the process does not complete in 10 seconds and another process starts for the refresh?
What will be the correct approach to implement this, as there might be other processes which use the DB link for some other purpose.
PS: MAX number of dblink in one session is 32