What is the best and fast way to insert 2 million rows of data into SQL Server?

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Aryan Kumar · Answer

Inserting a large number of rows into a SQL Server database efficiently involves optimizing the process to minimize the impact on performance. Here are some best practices for inserting a large amount of data:

Use Bulk Insert:

The most efficient way to insert a large number of rows is to use the BULK INSERT statement. This is a SQL command specifically designed for high-performance bulk data-loading scenarios.

Consider Batch Inserts:

Break down the data into smaller batches and perform multiple smaller inserts instead of a single large one. This helps to manage transaction log growth and reduces contention.

Disable Indexes and Constraints:

Temporarily disable non-clustered indexes and constraints before the insert and re-enable them afterward. This can significantly speed up the insertion process.

Use the TABLOCK Hint:

Adding the TABLOCK hint to your INSERT statement can improve performance by reducing contention.

Consider Using Table Partitioning:

If applicable, consider using table partitioning. This can enhance the performance of large data inserts, especially if the table is partitioned appropriately.

Adjust Database Recovery Model:

If you are working with a production database, consider changing the database recovery model to SIMPLE during the data insertion and reverting it afterward. This reduces the amount of transaction log activity.

Use SQL Server Import/Export Wizard:

SQL Server Management Studio (SSMS) provides an Import/Export Wizard that can help streamline the process of bulk data insertion. This wizard generates efficient bulk insert statements.

Optimize Disk I/O:

Ensure that your disk subsystem is optimized for high I/O performance to handle the large amount of data being inserted.

Remember to thoroughly test any changes or optimizations in a non-production environment before applying them to a production database. Additionally, consider working with your database administrator to ensure that these actions align with your organization's policies and procedures.

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