I want to try TiDB and I am working on data migration. Is there any way of migrating data from DB2 or Oracle to TiDB?
If using OGG to sync data to TiDB, you should set global tidb_constraint_check_in_place = 1 to disable the lazy-constraint-check in TiDB.
To migrate all the data or migrate incrementally from DB2 or Oracle to TiDB, you can use one of the following solutions:
Use the official migration tool of Oracle, such as OGG, Gateway, CDC (Change Data Capture).
Develop a program for importing and exporting data.
Export Spool as text file, and import data using Load infile.
Use a third-party data migration tool.
Currently, it is recommended to use OGG.
Oracle SQL Developer will capture and convert your LUW DB2 database and create it in an existing Oracle Database as new schema(s). It will move the data for you too.
Here's where you can go to learn more
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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 to pull some data from oracle and update the data in snowflake. And ofcourse the size of the data is 5gb.
Is there any procedure to connect to oracle database from snowflake? OR
Do I need to connect them using a programming language as python?
You'll need to unload the data from Oracle and load into Snowflake, as there are no "direct connect" options I've ever heard about.
I'd use SQL*Loader to unload, push the files to AWS S3 (or your cloud vendor's storage), and issue Snowflake COPY INTO TABLE commands, it should be fairly straightforward.
There is no equivalent to Oracle database links in Snowflake. You would need an external process to move the data from Oracle to S3. Then you can configure a Snowpipe task to load from S3 into Snowflake. See Loading Continuously Using Snowpipe for more information.
I would suggest to use python programming to extract and load data from oracle to snowflake. Since your oracle table is being updated daily write python program to generate merge statement dynamically to load your incremental data from oracle to snowflake.
Snowflake supports Java script based stored procedure so you can use stored procedure to generate merge statement dynamically by passing table name as parameter and you can call it via python.
Initial load from oracle to snowflake may take time as you have 5GB data from your source system.
There is one scenario where in our target is to migrate oracle database to Azure SQL DB.
Currently I am evaluating multiple options to migrate the existing Oracle Db to the Azure SQL DB, for the same reason I could not decide how to handle this situation where in the source DB i.e. Oracle is having transaction data which is a kind of incremental load.
Should this can be handled with mere replication of DB? or performing some data migration steps would help me ? Here i can think of earlier approach as easier approach where in i need not to worry about the transaction updates happening inside the data.
Considering this which utility i should use to perform this kind of activity?
You can replicate your Oracle database to Azure using Oracle Golden Gate as a way to migrate your Oracle database to Azure SQL. Striim seems to be another good tools to move your database to Azure SQL.
I think you may use the SQL Server Migration Assistant (SSMA) for Oracle.
SQL Server Migration Assistant (SSMA) for Oracle consists of a client application that you use to perform a migration from Oracle to SQL Server and Azure SQL DB. It also contains an extension pack that supports data migration and the use of Oracle system functions in your migrated databases.
SSMA can converts the transaction processing:
For more details, you can see:SQL Server Migration Assistant (SSMA) for Oracle
Hope this helps!
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 have a Microsoft SQL Server database(tables, relationships and data).
But now I want an exact same copy of this database in Oracle.
I was thinking there may be some sort of a tool or converter that could generate Oracle sql scripts that I could run to create and populate my new Oracle database.
Is this kind of thing possible?
And how can I achieve this ?
Your best bet is to use a DB modelling tool which can reverse engineer your SQL Server database and then generate a script to recreate it in Oracle.
DB Designer Fork can do this for you and is Open Source.