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9. A relation can only have one primary key 10. Durability in transaction managemens relers t ao die run as if there are no o

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9. A relation can have only one primary key ---- > TRUE

Explain - - A Primary Key can be defined on a single or multiple columns but it is unique always hence there can be only one primary key for a relation.

10. Durability in a transaction management refers to the requirement that a transaction should run as if there are no other concurrent transactions -----> FALSE

Explain -- Above definition is for Isolation property of a transaction , not Durability. Durablitity refers to the requirement that transactions which have been committed will survive forever.

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