THIS IS A TEST INSTANCE. ALL YOUR CHANGES WILL BE LOST!!!!

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If a transaction T wants to read (respectively, modify) an object, it first requests a shared (respectively, exclusive) lock on the object - same to S2PL2PL.
Write locks held by a transaction are released when the transaction is completed.

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If a transaction T wants to read (respectively, modify) an object, it first requests a shared (respectively, exclusive) lock on the object - same to S2PL2PL.
All locks (read + write) held by a transaction are released when the transaction is completed.

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