Transfer data from one database to another database

sql

data-transfer

sql-server-management-studio

database-migration

byAnton Shumikhin·Nov 30, 2024

For a quick data transfer between databases within the same server, use the INSERT INTO SELECT combo. In SQL, you would run:

-- Like moving a file from one folder to another
INSERT INTO target_db.table SELECT * FROM source_db.table;

When the above is not applicable (read: different servers), consider specialized tools like SSIS for SQL Server, mysqldump/pg_dump for MySQL/PostgreSQL, or Oracle's database links for a seamless migration.

Still here? Let's explore SSMS's Export Data wizard for more specific data transfer or the Generate Scripts option for a full-scale operation. Keep in mind to check column mapping, permissions, and consider testing with a subset of your data. For an extra layer of caution, be aware of performance implications when dealing with sizeable datasets.

Practical steps using SSMS

Script generation for data transfer

SSMS has a built-in tool, Generate Scripts, set aside for mass operations that include both schema and data transfer. How? Just follow these steps:

Right-click the database you want to script.
Select Tasks > Generate Scripts.
Follow the wizard to select objects, output format and options like script data creation.
When scripting tables, ensure particular options are set to TRUE under Table/View Options.

"Well, it doesn't produce a magic wand, but it's pretty close!" 😉

Data export wizard

Within SSMS, you can use the Export Data wizard to move data across databases:

Right-click the database to export from and select Tasks > Export Data.
The wizard will guide you to select source and destination databases.
Select the specific tables/views you want to export.
Finalize the process to export the data; it's like ordering a pizza!

"USE [database] statements are the onions of the scripting pizza, avoid unless you like onions, or strange database contexts!" 😜

Fun Fact: Azure life can be easier because it provides additional tools for managing cloud databases.

Widespread methods for efficient data transfer

Row-by-row transfer: "insert into select"

When operating in the same SQL instance, you can perform a precise data copying operation using:

-- Making copies faster than the office printer!
INSERT INTO target_db.schema.table SELECT * FROM source_db.schema.table;

Cloning tables: "select * into"

To easily clone a table between databases on the same SQL server, use this:

-- Spooky cloning action at a distance!
SELECT * INTO target_db.new_table FROM source_db.original_table;

Large-scale migration with SSIS

For SQL Server users, SQL Server Integration Services (SSIS) provides advanced extraction and transformation capabilities suitable for large-scale migrations

"Unlike the Transformers movies, SSIS keeps getting better with each release!" 😉

Systematic approach via SQL scripting

For those who prefer automation, you can run sysobjects cursors in your script to facilitate multiple table copies systematically.

"Are we still moving data or are we launching spaceships?" 🚀

Double-check, please!

Don't forget to check your access rights to both source and destination databases and assure the compatibility of server version and collation settings.

Post-transfer tasks and considerations

Ensure data integrity

Post-transfer, do verify your data integrity. You can use Visual Studio's 'New Data Comparison' for a detailed comparison of the source and destination data.

"Like checking if you forgot any socks after laundry!" 🧦

Handle sensitive data with care

Transferring sensitive data? Make sure you abide by all security measures and data protection regulations during the transfer process

"Remember: With great data, comes great responsibility!" 🕷️

Large volume transfers

Remember that transferring large datasets can impact server performance. Time your operations during off-peak hours or batch the data migration to minimize the performance effect.