Give me (a vague impression of ) SAFETY!

• Safety on the cheap (without transactions)

  • push change information onto an array
  • undo in reverse order, in place of rollback
  • consider signals etc.

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Classic example:

bank account transfer:

debit one account

credit another account

must be an ‘atomic’ operation.

Can’t allow debit without the credit.

Server-side errors: disk crash etc

Client side errors: program die()’s or is killed