What's the Best Way to Delete Millions of Rows in PostgreSQL by ID?

PostgreSQL database to efficiently delete millions of lines of data.

When removing millions of lines of data in the PostgreSQL database, there are many ways to choose from. The best way depends on the specific situation, including table size, concurrent access and external key constraints. Parallel writing access

If there is an interview with the compilation of the table, you must monopolize the lock table or find the alternative method.

Optimized strategy

Disable index:

Temporary deletion or disable index can significantly accelerate the deletion process. After that, the index was re -created. Remove the trigger:

If there is a trigger and can be safely disabled or deleted, this can improve performance.

• outer key management: determine whether there is a table that is referenced by the outer key, and consider temporarily deleting the external key constraint.
Vacuum and Analyze:
• run Vacuum Analyze before operation can improve efficiency.
Efficiently deleting technology
Trimching and re -inserting:
• For large tables suitable for memory, create a temporary table to save the remaining rows, cut off the main watch, and then reintegrate from the temporary table. It may be the fastest way. DELETE statement using sub -query:
If the table is relatively small, the simple delete statement using sub -query to identify the delete line may be more effective than Truncate.

Precautions

• Truncate limit: If the existing key reference or definition of the on delete trigger, Truncate cannot be used.
Affairs packaging:
• Packing the delete process in transactions can ensure the data integrity when the server collapses. Vacuum and Analyze:
After deleting, run Vacuum Analyze to recycle space and optimize performance.

The above is the detailed content of What's the Best Way to Delete Millions of Rows in PostgreSQL by ID?. For more information, please follow other related articles on the PHP Chinese website!