Where immovable property is still registered in the name of a judgment debtor at the time of attachment, a judgment creditor is entitled to attach and sell that property in execution, notwithstanding any prior unregistered sale to a third party. The purchaser's rights under an unregistered sale are merely personal rights which are subservient to the real rights evidenced by registration in the deeds office. While a court has discretion to set aside an attachment where special circumstances exist, the mere fact of a prior purchase and payment of the purchase price, without more, and particularly where there is an unexplained delay in registering transfer, does not constitute special circumstances sufficient to justify setting aside a judicial attachment. The attachment creates a pignus praetorium in favor of the judgment creditor who is entitled to rely on the deeds office records. The efficacy and integrity of the deeds registration system should not be compromised by readily allowing unregistered personal rights to prevail over registered real rights.