What you're doing is "loading data in memory" ... And you're not committing the changes you've made.
This is explained clearly in the docs DBD::AnyData
In reply to Re: DBD::AnyData delete rows
by ahmad
in thread DBD::AnyData delete rows
by Perly Eyed
| For: | Use: | ||
| & | & | ||
| < | < | ||
| > | > | ||
| [ | [ | ||
| ] | ] |