How can I determine the size of a dump file prior to dumping?
Please run this query:
SELECT
Data_BB / POWER(1024,1) Data_KB,
Data_BB / POWER(1024,2) Data_MB,
Data_BB / POWER(1024,3) Data_GB
FROM (SELECT SUM(data_length) Data_BB FROM information_schema.tables
WHERE table_schema NOT IN ('information_schema','performance_schema','mysql')) A;
This will give you a ballpark figure. The column index_length
is not used because mysqldump does not dump indexes, only data. Just to be safe, you should always gzip it immediately:
mysqldump --all-databases --routines --triggers | gzip > MySQLData.sql.gz
Give it a Try !!!