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Managing Multiuser Databases

Managing Multiuser Databases
Two transactions that run concurrently and generate results that are consistent with the results that would have occurred if they had run separately are referred to as serializable transactions.

True
False

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Managing Multiuser Databases
Which of the following locks the item from access of any type?

Shared lock
Explicit lock
Exclusive lock
Implicit lock

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Managing Multiuser Databases
Which of the following occurs when a transaction rereads data it has previously read and finds modification or deletions caused by a committed transaction?

Nonrepeatable read
Dirty read
Phantom read
Consistent read

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Managing Multiuser Databases
When two transactions are being processed against the database at the same time they are termed concurrent transactions.

True
False

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Managing Multiuser Databases
Which of the following occurs when a transaction rereads data and finds new rows that were inserted by a command transaction since the prior read?

Phantom read
Nonrepeatable read
Dirty read
Consistent read

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Managing Multiuser Databases
Which of the following refers to a cursor type where changes of any type and from any source are visible?

Static
Dynamic
Forward only
Keyset

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