Unless we are talking millions of rows and table of size 500+mb, nothing happens - it will be very fast,
Normally when you start running alters on your table it will get locked for a while, but unless the table is really big you wont notice anything. The performance of those operations depends on how much memory your system has and how mysql is configured, so i cant tell you exactly, but lets say 50k rows is a small dataset. -- You received this message because you are subscribed to the Google Groups "sqlalchemy" group. To view this discussion on the web visit https://groups.google.com/d/msg/sqlalchemy/-/CYdFcH0cADkJ. To post to this group, send email to sqlalchemy@googlegroups.com. To unsubscribe from this group, send email to sqlalchemy+unsubscr...@googlegroups.com. For more options, visit this group at http://groups.google.com/group/sqlalchemy?hl=en.
