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Annegret Mclean
New command line option --lo_import. By default Ora2Pg imports Oracle BLOB as bytea, the destination column is created using the bytea data type. If you want to use large object instead of bytea, just add the --blob_to_lo option to the ora2pg command. It will create the destination column with data type Oid and will save the BLOB as a large object using the lo_from_bytea() function. The Oid returned by the call to lo_from_bytea() is inserted in the destination column instead of a bytea. This option can only be used with actions SHOW_COLUMN, TABLE and INSERT, action COPY is not supported. If you want to use COPY or have huge size BLOB ( > 1GB ) than can not be imported using lo_from_bytea() you can add option --lo_import to the ora2pg command. This will allow to import data in two passes:
2) Execute all scripts lo_import-TABLENAME.sh after setting the environment variables PGDATABASE and optionally PGHOST, PGPORT, PGUSER, etc. if they do not correspond to the default values for libpq. You might also execute manually a VACUUM FULL on the table to remove the bloat created by the table update.
Limitation: the table must have a primary key, it is used to set the WHERE clause to update the Oid column after the large object import. Importing BLOB using this second method (--lo_import) is very slow so it should be reserved to rows where the BLOB > 1GB for all other rows use the option --blob_to_lo. To filter the rows you can use the WHERE configuration directive in ora2pg.conf.
I am using ora2pg tool for database migration(oracle to PostgreSQL). I have to exclude some object from export, For that i have made changes accordingly in ora2pg config file(add comma separate list in exclude directive).But when i execute this ora2pg config file it will export all object for me(Not exclude object that i added in exclude directive).Other directives working fine. Please help me to solve this problem.
The main technical consideration, and focus, in any migration should be the code. Whether its T-Sql or plsql, conversion to plpgsql is not trivial, and in some cases impossible. Therefore, as this post is an introduction to ora2pg, it will focus on a relatively simple schema migration.
You should now have an ora2pg_dist.conf file in your ora2pg installation folder. Use it as a template to connect to different oracle databases by creating a *.conf file for each by copying the file under a new name, e.g. ora2pg_oradb_name.conf. You should at least change the following values in this file:
The executable (ora2pg.bat) file is located under C:\ora2pg\ora2pg-21.0\blib\script. So to run a conversion, first create a folder to store the converted scripts and then open a command prompt, navigate to C:\ora2pg\ora2pg-21.0\blib\script and run:
@dab @dorian_yugabyte
Excuse me, I have some questions about compatibility with oracle and mysql.
May I ask you?
Now yugabyte is only compatible with pgsql, cql and redisright ?
How is yugabyte compatible with oracle and mysql ?
I understand that ora2pg is only a migration tool that can migrate data from mysql and oracle to pgsql.
However, the key point I focus on is how yugabyte is compatible with mysql and oracle, just like pgsql, csql and redis, and is available to users.
Thank you very much.
An important part of performing a migration from Oracle to PostgreSQL isselecting the right tool for helping with the conversion between systems. Whenpeople ask me how they can get the migration process started, I like torecommend a powerful open source utility called"ora2pg".
For this demo on how to install ora2pg, we are using a Centos 7.7 Environmentwith Oracle 12.1 installed. We will also be using ora2pg 20.0. ora2pg can eitherbe run on the PostgreSQL server or you can run it on the Oracle server. ora2pgwas run on my Oracle server. In this demo I used a virtual box to create myenvironment, I will assume that you have your Oracle environment already setup.
If you don't want to install ora2pg on the Oracle server and instead on thePostgreSQL server there are a couple of extra steps that need to be done. Firstyou will need to have PostgreSQL installed. If you need help installingPostgreSQL please look at thepreviously published blog post.
Before getting started there were some prerequisites my environment needed inorder to build DBD::Oracle and ora2pg. I needed to install a couple of perlmodules in order to get everything up and running. I did so by running:
Before we build/install ora2pg you need to build/install the Perl moduleDBD::Oracle. DBD::Oracle is a Perl module that works with the DBI module toprovide access to Oracle databases. If you would like to learn more about itplease click the following link ::Oracle.
After you have installed DBD::Oracle, you will then need to build/installora2pg. The steps below are similar to the steps in the documentation of ora2pgwhich you can find in this link The onlydifference is the first step, where you need to wget the tar file from ora2pgGithub archive.
After you have ora2pg built and installed you can now configure theora2pg.conf to work with your Oracle server. The settings that you see beloware the settings in my environment. The ora2pg.conf file has manyconfiguration settings that you can change. Below are the configuration changesthat you will need to apply to your ora2pg.conf in order to be able to useora2pg. Please keep in mind that you will need to change the settings to matchyour environment. If you would like to learn more about the other configurationsplease look at the documentation:
For those in the Windows world, you get some articles/videos on setting up Ora2pg, including Steps to Install ora2pg on Windows and Linux.pdf from Data SQL Ninja Engineering Team of Microsoft. And, none of them seemed to work. Malarkannan and I needed to set Ora2pg quickly.
Open the file C:\ora2pg\ora2pg.conf. Since we plan to use a DDL file as input, there's no need for Oracle or other details inside. Remove everything there. Just type this one line. Yes, just one-line.
Now we need to install DBI/DBD stuff that is required during the ora2pg Makefile phase, especially the DBD::Oracle. The DBD:Pg is optional, only if you need to dump data/schema live rather than offline to file.
PostgreSQL is one of world's most advanced open-source databases. This article describes how to use the free ora2pg tool to migrate an Oracle database to PostgreSQL. You can use ora2pg to migrate an Oracle database or MySQL database to a PostgreSQL-compatible schema.
The ora2pg tool connects your Oracle database, scans it automatically, and extracts its structure or data. Then ora2pg generates SQL scripts that you can load into your PostgreSQL database. You can use ora2pg for tasks such as reverse-engineering an Oracle database, migrating a huge enterprise database, or simply replicating some Oracle data into a PostgreSQL database. The tool is easy to use and requires no Oracle database knowledge besides the ability to provide the parameters needed to connect to the Oracle database.
Estimating the cost of a migration from Oracle to PostgreSQL isn't easy. To assess the migration cost, ora2pg checks all database objects, functions, and stored procedures for objects and PL/SQL code that it can't automatically convert.
The ora2pg tool can convert SQL and PL/SQL code from Oracle syntax to PostgreSQL. So after the database is analyzed, ora2pg can estimate the code difficulties and the time necessary to migrate a full database.
In this step of the migration, the Oracle code and DDL scripts are converted or translated to PostgreSQL. The ora2pg tool exports the Oracle objects in a PostgreSQL format automatically. Some of the generated objects can't be compiled in the PostgreSQL database without manual changes.
To understand which elements need manual intervention, first compile the files generated by ora2pg against the PostgreSQL database. Check the log, and then make any necessary changes until the schema structure is compatible with PostgreSQL syntax.
We recommend using the migration template that ora2pg provides. When you use the options --project_base and --init_project, ora2pg creates a project template with a work tree, a configuration file, and a script to export all objects from the Oracle database. For more information, see the ora2pg documentation.
After the project structure is created, a generic config file is created. Define the Oracle database connection and the relevant config parameters in the config file. For more information about the config file, see the ora2pg documentation.
In a delta/incremental migration that uses ora2pg, for each table, use a query that filters (cuts) by date, time, or another parameter. Then finish the migration by using a second query that migrates the remaining data.
Ideally, if the source and target databases have a networking path, ora2pg should be used for data validation. You can use the TEST action to ensure that all objects from the Oracle database have been created in PostgreSQL.
I want to export the content of the Oracle HR schema into the hr schema in PostgreSQL and set the owner of all objects to the user : gilles. I also want to preserve the case of the Oracle object name. For this purpose, i have set the following configuration in the ora2pg.conf file.
Before starting the data migration, we need to schema to be created in the PostgreSQL database. Ora2Pg can be used to perform the schema migration from Oracle to PostgreSQL. The Oracle schema as extracted using the ORACLE_DSN and the configuration specified in the ora2pg.conf file will be converted to a PostgreSQL specific syntax, with an appropriate data type mapping. In this example, we will just export the tables definition and create the same tables in PostgreSQL. We can create a directory in which the converted PostgreSQL DDL can be stored.
This is done just by giving a name for the foreign server to be created. Everything will be automatic based on the configuration we have already set. In ora2pg.conf just set the following configuration -
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