How to ensure data validity when the MYSQL table type is myisan

When the MYSQL table type is myisan, how does one ensure the data validity? When MYSQL does not support transactions, the PHP program operates on multiple tables in the database. how can we ensure data validity? & Nbsp; the MYSQL table type is uncontrollable because it is not an independent server. in this case, how can you ensure the data validity of multiple tables? For DZ and DEDECMS, when the MYSQL table type is myisan, how can we ensure the data validity?
When MYSQL does not support transactions, the PHP program operates on multiple tables in the database. how can we ensure data validity?
Because it is not an independent server, the MYSQL table type is uncontrollable. in this case, how can we ensure the data validity of multiple tables?
For example, DZ and DEDECMS also involve multi-table correlation operations. Their table types are also myisan, and I don't know how they solve them.

------ Solution --------------------
For databases that do not support transactions, you can write program code by yourself based on the principles of transaction processing. Nothing complicated

There are two solutions to describe your #3
1. if the master table record is deleted, it will be deleted. if the table deletion fails, it will continue to be deleted until it is successfully deleted.
You can also regularly check records without a master for deletion.
2. when the primary table record is deleted, the deleted record is cached first, and the deleted record is cleared after the table record is deleted successfully.
Otherwise, write the deleted record again.