______ is a set of transactions that have initiated, but have not still accomplished their validation stage
______ is a set of transactions that have initiated, but have not still accomplished their validation stage
In ______ phase, the serialisability of the schedule is verified by contrasting RS(T) and WS(T) to the read / write sets of the simultaneous transactions.
In ______ phase, the serialisability of the schedule is verified by contrasting RS(T) and WS(T) to the read / write sets of the simultaneous transactions.
The warning protocol is used to handle locks on a ______ of database elements.
The warning protocol is used to handle locks on a ______ of database elements.
._____signifies intention to request an S lock
._____signifies intention to request an S lock
The purpose of concurrency control is to guarantee the transactions serialisability in the environment of a______ database.
The purpose of concurrency control is to guarantee the transactions serialisability in the environment of a______ database.
A ______ timestamp is updated when the data of the object is changed
A ______ timestamp is updated when the data of the object is changed
If ______ transactions are proposed to read or write a sub element, an I lock is provided to both of them
If ______ transactions are proposed to read or write a sub element, an I lock is provided to both of them
Database ________ is concerned with the restoring of the database to an accurate state in the occurrence of a failure
Database ________ is concerned with the restoring of the database to an accurate state in the occurrence of a failure
.______ signifies intention to request an X lock
.______ signifies intention to request an X lock
____ is a set of transactions that have accomplished all the phases
____ is a set of transactions that have accomplished all the phases