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Managing Multiuser Databases

Managing Multiuser Databases
In optimistic locking, the assumption is made that conflict will occur.

False
True

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Managing Multiuser Databases
Which of the following allows dirty reads, nonrepeatable reads and phantom reads to occur?

Read uncommitted
Serializable
Read committed
Repeatable read

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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
Consistent read
Dirty read

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Managing Multiuser Databases
Which of the following refers to a cursor type that when the cursor is opened, a primary key value is saved for each row in the recordset; when the application accesses a row, the key is used to fetch the current values of the row?

Static
Forward only
Dynamic
Keyset

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Managing Multiuser Databases
The size of a lock is called:

implicit lock
shared lock
exclusive lock
lock granularity

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Managing Multiuser Databases
Locks placed by the DBMS are called ________ .

exclusive locks
implicit locks
explicit locks
shared locks

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