Is it possible to connect multiple databases?

Question

Being able to connect to multiple database instances simultaneously offers many benefits, from being able to query multiple instances using the same SELECT statement, to easier migration. In fact, we explored How to Query across Multiple Databases in the previous tip. 12 июн. 2019 г.

How do I connect two databases?

The tables and databases will be created under the same server.1Step 1: Create the first database and table. ... 2Step 2: Create the second database and table. ... 3Step 3: Join the tables from the different databases in SQL Server. ... 4Step 4 (optional): Drop the databases created.

How do I connect to multiple mysql databases?

Connecting Multiple Databases with PHP MySQLi:1Step-1) Open the Mysql Connection. ... 2Step-2) Select and Retrieve Records from the First Database. ... 3Step-3) Select and Retrieve Records from the Second Database. ... 4Step-4) Closing the Connection. ... 5Step-1) Connect First Database with PDO. ... 6Step-2) Connect the Second Database.

Can I establish two database connections at a time?

Yeah, its smart to set up multiple connection using connection pool for many reasons. Using a connection/statement pool, you can reuse existing connections/prepared statements, avoiding the cost of initiating a connection, parsing SQL etc.

Expert · Answer