A core.sql.gz file is a compressed GZIP archive containing a SQL database dump, typically used for or transferring large databases . The ".gz" extension indicates it has been compressed using the Gzip algorithm .
: Gzip compression can reduce the size of plain text SQL files by up to 70–90% . This is particularly effective because SQL dumps contain many repetitive strings (like table names and column headers) that compress efficiently.
: Many web-based management tools like phpMyAdmin have strict file size limits for imports. Compressing a large .sql file into a .sql.gz often brings it under these limits, allowing for easy browser-based uploads.
Its primary "useful feature" is significantly reducing the file size of database exports, making them easier to store and faster to move over networks. Core Benefits