Sign Up to our social questions and Answers Engine to ask questions, answer people’s questions, and connect with other people.
Login to our social questions & Answers Engine to ask questions answer people’s questions & connect with other people.
Lost your password? Please enter your email address. You will receive a link and will create a new password via email.
Please briefly explain why you feel this question should be reported.
Please briefly explain why you feel this answer should be reported.
Please briefly explain why you feel this user should be reported.
I have dumped a database using phpmyadmin and had 390MB
and then imported it using command line into new database, then it showed the size 360.
Why this imported database is smaller? Thanks.
When you delete data from a database, the records usually aren’t actually deleted from the database files, just marked as deleted – the space can be reused for new records later. When you export a database, these deleted records naturally aren’t exported, or recreated when you import the database.
This reuse saves a little time when records are added, because you don’t always have to make the file larger. And it saves a lot of time when deleting records – deleting something from the middle of a file involves shifting all the data that comes after it.