How To Create Dblink Between Two Different Databases In Oracle

Restriction on Creating Database Links You cannot create a database link in another user's schema, and you cannot qualify dblink with the name of a schema. (We note in passing that such a format also leads to ambiguities regarding the meanings of blank fields. From Oracle to SQL they call it DB link. The Oracle Names server has been deprecated. However, to access non-Oracle systems …. 1) So I can't run multiple queries at once? It seems to wait until I am finished with one query before the second kicks off, it would be nice to run stuff in tandem. I want to access the data in instance B from the instance A. People coming from SQL Server and MySQL often complain about how you can't query other databases from within a PostgreSQL database. So I wanted to create a link between MySql and Oracle bases (similar to dblink for oracle databases) To connect these two databases, I have installed mysql-connector-odbc-5. dll was not. Even though we focused on the DBCS configuration, these steps can be applied when setting up a database link between ADW and any other Oracle database. SQL> revoke create database link from ; 2) Using a procedure We could not drop other schema's database link with schema qulalifier Since dot is allowed in the database link name. How to join tables from different databases in SQL select statement? Apr 30, 2008 10:32 AM | funluckykitty | LINK I have a basic sql statement, where I have a usersID, and I want to joing that usersID to another table in another database to get the users first and last names. In my application, I've managed to downgrade the driver version to 10g, so it can connect to both databases. Ardiansyah's Blog don't be lazy to share knowledge :) Using a DBLink in Oracle 11gR2 to Connect to an IBM DB2 Database. grant create. Restriction on Creating Database Links You cannot create a database link in another user's schema, and you cannot qualify dblink with the name of a schema. There are different database. ora tns_admin global_names Replication Oracle Database Links global_name Replication. However, related fields must have the same data type unless the primary key field is an AutoNumber field. Both Data Pump and DBLINK offer great performance benefits, but Data Pump can upload data faster than. Periods are permitted in names of database links, so Oracle Database interprets the entire name, such as ralph. Nassyam Basha is a database administrator. Basically, Oracle now state that database links between Oracle 9. MySQL and Oracle Database are complementary databases best suited to different use cases. Net Framework using C#. I'll explain them in this. I am not a big fan of database links, mostly because of the way people abuse them. 4 issue: we have 2 indepandent databases A & B on 2 different sunboxes. When you select this. For example, for more information on SQL Server + Oracle, see the articles Migrating database schema from Microsoft SQL Server to Oracle using Entity Framework and Preparing for multiple databases. "Must Watch" How to Create a Dblink Between Two Oracle Database oracle12c/11g instance in different machine. • One or more queries (or views) that reference the Table UDF. Oracle Tutorial. Let's create a view based on multiple table. Third step is to apply an amplification function which amplifies the difference between each amplitude and those of the equal superposition states. then oracle create session from SRV1 instance to MYDB instance. The name of the DB Link should be same as the global name of the target database. Nigel Thomas Romeo Yes, there's no problem creating loop-back database links - very common (we used to use DB links to spread workload across multiple databases in Oracle 7 / 8; works fine in test with loopback then and now). Connect to PostgreSQL database from other applications. What Is The Create Table Command Used For? The SQL CREATE TABLE command is used to create a database table. computer programs or embedded libraries), mostly working in different and very unique ways. Every time you create an index (either explicitly with CREATE INDEX or implicitly with a UNIQUE or PRIMARY KEY declaration), you should (on the Stanford Oracle) follow the declaration by TABLESPACE INDX. > > >Apparently MySQL lacks this feature, but what feature is it lacking? >There's no equivalent to: > >SELECT * FROM database. Thanks for making this one. remember that u put the single quote in the connect string. COM USING 'ORCL'; Database link created. If your database initialization parameters include GLOBAL_ NAMES=TRUE, then the database link name must be the same as the name of the remote instance you are connecting to. We have two SQL 64-bit clusters in our organization: a four-node production cluster and a two-node dev/test cluster. Database - 1054 Database interview questions and 3331 answers by expert members with experience in Database subject. Before you can perform those actions, however, you must create at least one database connection an Oracle SQL Developer object containing the information needed to connect to a specific database as a. " "Oracle," "SQL Server," and "FoxPro" are examples of advanced database applications with programming languages that can be used to build custom business solutions in. R&D costs play a. I don't have admin right on ServerA but have different accounts to access on each databases on ServerA. under SYS schema. This article specifically talks about multiple applications sharing a database running on OpenShift using an example that you can follow step-by-step. When you have connected to your databases, Schema Compare for Oracle goes off and retrieves the schema information from both of those instances, builds up a picture of all the objects that are in the schemas and identifies any differences. There are two sets of Oracle Export/Import utilities: [Old] Original Export/Import (exp/imp); [New] Oracle Data Pump Export/Import (expdp/impdp); In general, you should use new Oracle Data Pump utilities (available since Oracle Database 10g) because they are superior. For example, tasks like backup and disaster recovery are performed at the container database level. Basically, I need to grap some data about products in different tables in the first database and re-arrange them for other tables in the second database. Net Framework using C#. To Create a Read-Only user you do the following two steps: Create user Alan_K identified by this_is_my_password; Grant connect to Alan_K;. Elevates performance levels by 20% and ensures consistent uptime Automates the task of calibrating system configurations, giving staff more time to. SQL> revoke create database link from ; 2) Using a procedure We could not drop other schema's database link with schema qulalifier Since dot is allowed in the database link name. Any help, highly appreciated. However, to access non-Oracle systems …. Connect without a DSN (using a connection string) To create 'examples' database on your MSSQL Server you should run the following script: CREATE DATABASE examples; USE examples; CREATE TABLE cars( id int UNIQUE NOT NULL, name varchar(40), year varchar(50), PRIMARY KEY(id) ); INSERT INTO cars VALUES(1,'Mercedes','2000'); INSERT INTO. The following is an outline and description of the database tables created during the standard installation of WordPress. The problem am facing is am in a situation where I can't create 2 distinct physical databases. Try to visit my site @ www. 0 Relational Databases This is the most common of all the different types of databases. While support for ISO/IEC 9075-9 bridges the gap between the two competing philosophies surrounding schemas, MySQL and Informix maintain an implicit association between databases while ISO/IEC 9075-9 requires that any such linkages be explicit in nature. Almost as fast - If your schemas are in different databases, check "Allow Toad to create a temporary DB Link from Target to Source". I am hoping that I can using another process to link between them using SQL without using a dblink. You can see a popup window Create New Databases asking for the database name for the new database. With Oracle APEX and low code, your organization can be more agile - develop solutions faster, for less cost, and with greater consistency. Verify the valid route between the DB instances by using your VPC routing tables and network access control list (ACL). 2 Advanced Use of RDBMSs. In addition, if you develop an application that uses an appropriate driver, the application can connect to the PostgreSQL database server as well. With TNS CREATE DATABASE LINK CONNECT TO IDENTIFIED BY USING '' Important: must be register in tnsname. Empower professional developers and everyone else in your organization to be a part of the solution. If this fails to work, rename Listener. In this case, Toad creates a private DB Link on the target database. In the course of developing an application, you create structures such as tables and indexes to store rows and speed their retrieval. Now we'll model the database accessed by the system. How to join tables from different databases in SQL select statement? Apr 30, 2008 10:32 AM | funluckykitty | LINK I have a basic sql statement, where I have a usersID, and I want to joing that usersID to another table in another database to get the users first and last names. To store an object in a relational database you need to flatten it – create a data representation of the object – because relational databases only store data. But sometimes you have to use old utilities. Periods are permitted in names of database links, so Oracle Database interprets the entire name, such as ralph. (Master 2) SQL> CREATE PUBLIC DATABASE LINK TEST. He has authored 12 SQL Server database books, 24. HowtoForge provides user-friendly Linux tutorials. Using an Oracle connection in a cross-connection query: To use an Oracle connection in a cross-connection query, you must install an Oracle ODBC driver. The last two steps are similar to the steps if APEX and EBS reside in same database, except that synonym is created via database link. Oracle) by setting up a linked server and doing something such as servername. In Microsoft SQL Server, there is a concept of querying across databases on the same server with dbname. Our SQL tutorial will teach you how to use commonly used SQL commands and you will be able to apply most of the knowledge gathered from this SQL tutorial to any of the databases above. would create temporary db link, then run the statement and, finally, drop the link. You can then transfer the file to the other machine and feed it as input to the mysql client. I need a solution how to connect 2 oracle databases using DBLink. I need to know how to perform the transfer going both ways - namely, from a SQL Server 2014 database to an Oracle 11g database as well as from Oracle 11g to SQL Server 2014. However, to access non-Oracle systems …. 025 per hour. Most good business applications contain a built-in reporting tool; this is simply a front-end interface that calls or runs back-end database queries that are formatted for easy application usage. Leslie Lim said I have found your blogs to be friendly and welcoming. The fix is obvious, but probably, the poor soul who has to fix this is not you, but someone else who has to figure out among possibly hundreds of columns, which ones don't match. The other database need not be an Oracle Database system. The host is the network location of your DBaaS instance. 99 xpert Edition. CREATE DATABASE LINK mysql CONNECT TO "my_user" IDENTIFIED BY "my_password" USING 'mysql'; The user name and password should be valid within MySQL so that it can connect from the Oracle host. Comparing Diffs Between Two Oracle Database Schemas February 28th, 2011 When developing databases, we frequently need to check what changes were made to its schema, if any mistakes were made, and, if there are any, we should roll back to the working version saved in the source control system. And you can only do this on the primary key. Doing the below works when i have two databases (test & dev) on the same machine (server1) How can I do the same logic, but on different machines ? Example = dev is on server1 and test is Oracle -- Database LINK -- on two different servers. I will show with an example, how to connect the two different databases using Linked Servers in SQL Server 2008, 2012 step by step. Some databases allow you to make a distinction between these with separate create schema and create user commands. It can be used to create different types of. As such, it enables communication to an Oracle database through a WCF endpoint address. Once preparation is done for that database object, you can build report on that view using sql query say ' select * from ar_customers_v '. I mentioned in most cases when query can use both of the ways using. Hence all the tables are related to each other through several key fields. 2 to Oracle 11g. How to Compare Two Oracle Schemas. How To Set Up Oracle Streams The purpose of this document is to describe the procedures for setting up a streams environment, starting the various streams capture and apply processes and monitoring the streams functionality through OEM. 2 days ago · You often hear that data is the new oil. Oracle) by setting up a linked server and doing something such as servername. Database basics. You can create synonyms for the object names, view objects in different databases (across database links), and restrict access to the objects. Microsoft’s Access DBMS is used to work with databases in its own Microsoft Access Database format. As u mentioned in step 5 to enable supplemental logging for the table. I want the other way, reason being, I have 100's of oracle database and I need to pull data from these oracle databases and store into PostgreSQL. One option would be : SQL* Plus/ SQLCL - COPY command This is one of the least known feature provided by Oracle. afaik there is no direct "database link" in mysql like there is in oracle. column2 FROM table1, table2 WHERE table1. 2) - Oracle 12. Access Desktop Database Links. I utilise the three different relationship types found in relational databases which are one-to-one,one-to-many and many-to-many relationships then build SQL queries using table joins to retrieve our information. 1 day ago · Synthetic Database: SQL and Oracle VDI Full Clone and Linked Clone Traces Starting with peak random 4K read performance, the DataCore HCI-Flex Appliance started at 9,591 IOPS with a latency of 412μs and went on to peak at 91,091 IOPS at a latency of 44. If the segment is busy with an uncommitted distributed transaction Oracle will either have to create a new undo segment to hold new transactions or extend an existing one. How to See Two Tables at the Same Time in Oracle SQL Developer HOW TO OPEN MULTIPLE TABLES IN SQL DEVELOPER SIMULTANEOUSLY as you open a database object in. I am hoping that I can using another process to link between them using SQL without using a dblink. This article describes how to connect to container databases (CDB) and pluggable databases (PDB). However, to access non-Oracle systems …. We will attempt to describe these issues and solutions for both Oracle Express as well as MS SQL Express databases. Views and Queries translation between different databases. We are all familiar with the buffer cache, keep cache, library cache, shared pool, PGA/UGA and so on. SQL> revoke create database link from ; 2) Using a procedure We could not drop other schema's database link with schema qulalifier Since dot is allowed in the database link name. Now a=b=d and c is different and negative. • Manage many databases as one. both are connected via db link. So we’ll need to add a link to our User table into the Address table. Also, you must have the CREATE SESSION system privilege on the remote Oracle Database. x database will not cconnect to a 7. We aren't allowed to create database links between production. The database link is used to accomplish this, and as a result, the materialized view will refresh properly. The problem am facing is am in a situation where I can't create 2 distinct physical databases. I am not a big fan of database links, mostly because of the way people abuse them. This site was created as an online reference for various ADO and ADO. Hi All, I need to join two tables which reside in two different databases in the Source qualifier. mysql> USE menagerie Database changed. Use the CREATE DATABASE LINK statement to create a database link. Now a=b=d and c is different and negative. similar question with more info: Oracle Database Link - MySQL Equivalent?. See the documentation for your database for details. Connect to PostgreSQL database from other applications. Toad for Oracle is the de facto Oracle developer and database administration software tool for SQL development and tasks. In this article, I’m going to show you how to create database link step by step. This is my third blog post about DB Link encryption/decryption. It is not the database itself; rather, it is the software used to create the database. The “BYOL” model is designed for customers who prefer to use existing Oracle database licenses or purchase new licenses directly from Oracle. Your database needs to be created only once, but you must select it for use each time you begin a mysql session. A database link (DBlink) is a definition of how to establish a connection from one Oracle database to another. As a developer he has limited privileges on Unix machines so he can't edit and save tnsnames. how to take Database link metadata some cases, we may need to take metadata of DB links and re-create them with few changes on the same db or other DB. The Microsoft BizTalk Adapter for Oracle Database is a Windows Communication Foundation (WCF) custom binding. How could I make a relationship between two different tables from two different databases in Oracle? If you have two schemas in the SAME database, S1 and S2, you can do a FOREIGN KEY constraint BETWEEN S1. To create a public database link, you must have the CREATE PUBLIC DATABASE LINK system privilege. How to join tables from different databases in SQL select statement? Apr 30, 2008 10:32 AM | funluckykitty | LINK I have a basic sql statement, where I have a usersID, and I want to joing that usersID to another table in another database to get the users first and last names. Doing the below works when i have two databases (test & dev) on the same machine (server1) How can I do the same logic, but on different machines ? Example = dev is on server1 and test is Oracle -- Database LINK -- on two different servers. When any process wants to write, it must lock the entire database file for the duration of its update. Linked servers are a way to link to different OLEDB compatible data sources from within SQL Server. Can we create a DB link between the two database servers? If yes then your query will look this this SELECT … FROM x_local_table, [email protected]_link WHERE…. When the two forms are linked together properly, you will be able to browse. This is akin to database links in Oracle which we had covered…. 1 day ago · Clinical trials are an expensive stage in a pharmaceutical product’s development. Once Oracle Names was deprecated the feature was moved to the replacement LDAP Naming. linktosales , as the name of a database link in your schema rather than as a. Here is an example. This is akin to database links in Oracle which we had covered…. i dont want to use export/import utility. Step 6: You can now use the database link to a foreign database: select * from [email protected] Keep the following points in mind if installing multiple PeopleSoft databases within one Oracle database instance: • When supporting multiple databases in one Oracle instance, increase maxdatafiles from the default of 32 when you create the database. I was quite surprised to find out that EF didn’t support making one edmx file span multiple databases, and so came up with this solution to get around that using SQL Synonyms. If owned by PUBLIC the database link may be accessed by all users on the database. How to Create a Foreign Key on a Table in Oracle SQL There are two ways to create a foreign key on a table in Oracle: the inline method and the out-of-line method. In this article, I’ll walk-through several ways of copying a table(s) between SQL databases, helping you to see the benefits and trade-offs of each option. • One or more queries (or views) that reference the Table UDF. On the database server, a listener process is configured by way of the listener. If you have experience creating databases, setting up an online database is a very similar process: You obtain a database server account and use software tools to set up a new database and create data structures in it. SonTB and S2. But the sample database-copy classes you'll find here provide a basic template for nearly every type of copy you need to perform. dll was not. Comparison of different SQL implementations. In this post I want to describe how to create a PDB by cloning a remote existing pluggable database: at the end of this process you should have a new PDB (in my case PDB103) contained in a target CDB (CDB001) cloned from a source PDB (PDB003) contained in a remote different CDB (CDBTEST). The connected user in the local database who uses the database link determines the remote schema. How to create database link, A database link is a schema object in one database that enables you to access objects on another database. Even though we focused on the DBCS configuration, these steps can be applied when setting up a database link between ADW and any other Oracle database. The username is the OS user on the DBaaS server you are connecting to via SSH. My goal, today. column2 FROM table1, table2 WHERE table1. It is working properly when I connect from the Oracle for Windows to Oracle for Linux, but there is a problem to connect from Oracle for Linux to Orcale for Linux/Windows. schema B1 in database B updates data based on selected data from database A, shchema A1 some thing like. From Oracle to SQL they call it DB link. Hi All, I need to join two tables which reside in two different databases in the Source qualifier. would create temporary db link, then run the statement and, finally, drop the link. This is part of the table definition, so you need to re-create the table to do this. The only database supported by WordPress is MySQL version 5. It can only replicate data (not procedures, indexes, etc), replication is always one-way, and snapshot copies are read only. Just for information, I am able to connect to sqlplus from the DB on linux to the db on Windows. I need a solution how to connect 2 oracle databases using DBLink. How to compare the content of two databases?. How to install ORACLE 10g R2 on Linux 5. With TNS CREATE DATABASE LINK CONNECT TO IDENTIFIED BY USING '' Important: must be register in tnsname. This step is used to capture a snapshot of the current. As such, it enables communication to an Oracle database through a WCF endpoint address. My target is to automate data extraction process from MySql databases from different server. dmp logfile=expdp. Users and PL/SQL subprograms in any database can use a global link to access objects in the corresponding remote database. Tricking EF to span Multiple Databases I was working on a project recently that used Entity Framework and had to span multiple databases. I've got two database on different network. PeopleSoft does not use database links between databases because they are a database platform specific technology. I have 2 oracle databases (db1 and db2) on different machines, lets suppose: db1 on 192. ora file and after that create a dblink using a name given to db2 in tnsnames. A database link (DBlink) is a definition of how to establish a connection from one Oracle database to another. I've got two database on different network. 0 Relational Databases This is the most common of all the different types of databases. Being in Business Intelligence Support we deal with plenty of connectivity issues and this is one topic of connectivity that does not get touched on a lot. I need to link to SQL Server as part of a band-aid before migrating everything to Oracle. The syntax on these pages is based on Oracle version 9. The syntax for the BETWEEN condition in Oracle/PLSQL is: expression BETWEEN value1 AND value2; Parameters or Arguments expression A column or calculation. The other database need not be an Oracle Database system. then oracle create session from SRV1 instance to MYDB instance. 0) - 64bit? I'm creating a new database using 12c and I want to be able to get my data from the current 9i database to the 12c database. ora? Please help me. The listener routes the incoming request to the target database instance (either dev11g or db01) and establishes the initial connection handshake between the database instance and client. ora files for its configuration; the database administrator (DBA) manages it by using the lsnrctl command-line utility. Database link are used to connect to database which is on different host and different instance, where you cannot use schema. Can anyone help on this, I have two sql servers 2008, Server A is located on Domain A, and the Server B is located on Domain B. One simple way to query multiple tables is to use a simple SELECT statement. You can create synonyms for the object names, view objects in different databases (across database links), and restrict access to the objects. But sometimes you have to use old utilities. When you have connected to your databases, Schema Compare for Oracle goes off and retrieves the schema information from both of those instances, builds up a picture of all the objects that are in the schemas and identifies any differences. Below is a simple example of this in action, connecting to a MySQL database using the new sakila sample database:. by thatjeffsmith. Here is an example. thanks in advance. Some databases allow you to make a distinction between these with separate create schema and create user commands. I need to know how to perform the transfer going both ways - namely, from a SQL Server 2014 database to an Oracle 11g database as well as from Oracle 11g to SQL Server 2014. 3 • One or more foreign DBMS’ to intereact with. The other database need not be an Oracle Database system. In this case, Toad creates a private DB Link on the target database. For example, for more information on SQL Server + Oracle, see the articles Migrating database schema from Microsoft SQL Server to Oracle using Entity Framework and Preparing for multiple databases. Most resources can be moved between compartments. When using a given database link, the database containing the edb_dblink entry defining this database link is called the local database. Restriction on Creating Database Links You cannot create a database link in another user's schema, and you cannot qualify dblink with the name of a schema. He started working with dBase and FoxPr and has participated in several projects with FoxPro and Oracle Database starting from Oracle 7. I have a Oracle 11G db running on Linux server(64bit). Best regards, Vishal. I am not a big fan of database links, mostly because of the way people abuse them. Currently use DB LINK to migrate many databases from 8. But sometimes you have to use old utilities. To retrieve the object you would read the data from the database and then create the object,. AWS RDS Oracle database support datadump as a mean to export/import data. I don't know if it is a known issue or not or if it depends of different Oracle version or Operating System. You can call more than one table by using the FROM clause to combine results from multiple tables. I have to implement data synchronization between two big databases which have completely different structures. If it is a table of products and the PRODUCT ID is the primary key, no two records can have the same ID. Just for information, I am able to connect to sqlplus from the DB on linux to the db on Windows. I will show with an example, how to connect the two different databases using Linked Servers in SQL Server 2008, 2012 step by step. AWS Documentation » Amazon Relational Database Service (RDS) » User Guide » Oracle on Amazon RDS » Importing Data into Oracle on Amazon RDS The AWS Documentation website is getting a new look! Try it now and let us know what you think. I decided to create this demo because the question of how to select multiple records in a multi-record data block is a fairly common topic in the Oracle Technology Network (OTN) Forms discussion forum. Many home and small business owners create simple databases such as customer contact and mailing lists with easy to use software such as Microsoft "Access" and "FileMaker Pro. how to take Database link metadata some cases, we may need to take metadata of DB links and re-create them with few changes on the same db or other DB. As a developer he has limited privileges on Unix machines so he can't edit and save tnsnames. 1 and db2 on 192. The port forward screen allows you to accept traffic from port 22 to the DBaaS Listener port of 1521. Database Report: A database report is the formatted result of database queries and contains useful data for decision-making and analysis. Let's say A and B are two instances. NET SQL database connection strings. Exporting MySQL database to a dump file. This is part of the table definition, so you need to re-create the table to do this. 0) - 64bit? I'm creating a new database using 12c and I want to be able to get my data from the current 9i database to the 12c database. Syntax: CREATE public DATABASE LINK CREATE DATABASE LINK 3. How could I make a relationship between two different tables from two different databases in Oracle? If you have two schemas in the SAME database, S1 and S2, you can do a FOREIGN KEY constraint BETWEEN S1. The purpose of this step is to perform LEFT OUTER join between the results from the first and the second step. There can be dependencies between various schema objects, as a schema object can include references to other schema objects. By default, only the person who create a table may access it. Learn how to create tables, what the syntax is, and see some examples in this article. > production system to a temporary table on the test system and then use. Comparing Diffs Between Two Oracle Database Schemas February 28th, 2011 When developing databases, we frequently need to check what changes were made to its schema, if any mistakes were made, and, if there are any, we should roll back to the working version saved in the source control system. If you specify SHARED, you must also specify the dblink_authentication clause. The dblink is correct and it work between same Oracle Database version and OS. For example, for more information on SQL Server + Oracle, see the articles Migrating database schema from Microsoft SQL Server to Oracle using Entity Framework and Preparing for multiple databases. Eventually undo space could be exhausted, but prior to this it is likely that data would have to be discarded before the undo_retention period has expired. For example, you can create a query that joins managers from a SQL Server database to their employees in an Oracle database. SQL> CREATE PUBLIC DATABASE LINK USING ; SQL> CREATE PUBLIC DATABASE LINK redwood USING orcl ; Any user connected to the local database can use the redwood dblink. Step 6: You can now use the database link to a foreign database: select * from [email protected] Oracle check for a dblink with the given in under the same schema >drop database link perf_mon. About designing a database. Pages covering the newer functionality (RAC, Data Guard etc) may appear in the future. AWS RDS Oracle database support datadump as a mean to export/import data. However, based on my information non-CDB mode will be available only in 12c release 1 for compatibility reasons and. Leslie Lim said I have found your blogs to be friendly and welcoming. In this article, I'm going to show you how to create database link step by step. Oracle Net must be installed on both the local and remote Oracle Databases. This article discusses some of the general points about database links, as well as highlighting the common mistakes associated with their use. Please help with how to create database link from oracle to sql server. In the course of developing an application, you create structures such as tables and indexes to store rows and speed their retrieval. Create a connection to the Oracle Database. 1) The multitenant option introduced in Oracle Database 12c allows a single container database (CDB) to host multiple separate pluggable databases (PDB). Global Database links were introduced in earlier versions of Oracle when the Oracle Names Server was in use. Tricking EF to span Multiple Databases I was working on a project recently that used Entity Framework and had to span multiple databases. My question was, as both schemas are on the same physical database, is it possible to create a database link between schema A and Schema B, dear Kamran. This article discusses some of the general points about database links, as well as highlighting the common mistakes associated with their use. In cases where you need to migrate, SQL Developer is a free and fully supported product that provides tools and utilities to migrate from MySQL to Oracle. OraPowerTools is a collection of native oracle database utilities. For most cases, these two settings will not need to be modified. What can be done that when I connect to remote database I get the procedures & packages of the remote database in SQL Developer console tree. Folks use dblinks all the time. He has authored 12 SQL Server database books, 24. Need to create a public database link first: (Master 1) SQL> CREATE PUBLIC DATABASE LINK ORCL. Syntax: SELECT table1.