I have started working with mysql earlier, where different database meant completely different database, and I can create delete databases.
but when I started to working with oracle, the structure really confused me, the 'database' term means the same in Oracle as Mysql? If not whats the difference?
Thanks!
Oracle doc explain the difference (and migration tips):
2.2.5.1 Databases
When migrating MySQL databases to Oracle, SQL Developer maps each MySQL database to a tablespace in Oracle. Database objects, such as tables, indexes and views are stored in the respective tablespaces and are referenced from the Oracle schema for the user that owns them.
Related
We are migrating our database from SQL Server to Oracle using the SQL developer tool. While migration, the schema name in SQL Server is "schmdw". This schema is used in our datawarehouse or OLAP database AdvworksDW. After migration we were expecting the schema/user name in oracle will be schmdw. But it is coming as schmdw_AdvworksDW i.e. schemaname_databasename. How can we get rid of this and get the schema/user name in Oracle as schmdw only? Can anyone help me in this regard?
In Oracle, there's no supported way to rename a schema/user. The best solution for you is to create another user, SCHMDW in your case, and give it grants on all objects of the SCHMDW_ADVWORKSDW plus synonyms. Have a look at the second comment on this post, it gives a pl/sql script to automate that.
I noticed that my oracle db automatically creates tables with names such as #T10_sid:201349704_1_FiltFilte.
Does anyone know how these tables are created / what creates them? They are starting to clog up my table list so I would also like a way to automatically remove them (as long as they are not needed).
Can anyone help me there?
Edit:
I am using Oracle SQL Developer, if that makes any difference.
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 need to create interfaces between two different databases. I have an Oracle database and another Postgresql database.
The problem is that the schemas and structures of the databases are different.
I have performed migration / interface processes between two Postgresql databases before, but never with Oracle.
I think it is possible to do it with DBlink.
I need to keep both databases updated (bidirectional).
What do you suggest is a good alternative?
I have a Oracle SE1 11.2 instance running. It has one database in it. How can I create another database. I have been using Mysql so far and I am able to create as many databases with it but when tried with Oracle it gives an error.
Oracle is different from MySQL in how it terms databases, instances and schemas.
For Oracle each instance has only one database, but each database can have many schemas.
RDS provides only 1 instance(database), if you want many you pay for each instance you want by launching a new instance. However, each instance can support multiple schema's. On RDS you can create up to 30 schema's for Oracle. (see the RDS FAQ).
Because each user = a schema, and each schema has its own tables independent of other schema's you can have up to 30 "databases" by leveraging the schema model.