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What is isolation level?
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Answer / vignesh
DB2 Provides different levels of protection, To isolate data
1. UN COMMITTED READ
2. CURSOR STABILITY
3. READ STABILITY
4. REPEATABLE READ
| Is This Answer Correct ? | 2 Yes | 0 No |
Answer / narasimharao
it specifies level of locking is calling isolation
| Is This Answer Correct ? | 2 Yes | 0 No |
Answer / pandurangan
DB2 ensures concurrency through ISOLATION levels, which
determines how data that is accessed or modified by one
transaction is isolated from other transaction.
There are 4 levels of isolation
1) Repeatable Read - if a transaction scans 1000 rows to
retrieve 20 rows, lock is acquired and held on all 1000 rows
until the transaction is complete.
2) Read Stability - If 10 rows are retrieved then lock will
be on 10 rows only till the completion of transaction.
3) Cursor Stability - Only locks the row that is referenced
by a cursor that was declared and owned by the transaction.
4) Uncommitted Read - Its just like read, since you haven't
committed you can see others making changes to it while you
are still on it.
For more details go to http://db2guide.blogspot.ie/
| Is This Answer Correct ? | 0 Yes | 1 No |
Answer / narasimharao
there are three types
1.cursor stability
2.rerepeatable read
3.uncommited read or dirty read
| Is This Answer Correct ? | 0 Yes | 2 No |
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4. A DB2 application is bound with uncommitted Read isolation level.It issues a request that retrieves 20 rows out of 200000 in the table. Which of the following descrbes the rows that are locked as a result of this request? a. None of the rows are locked. B.The retrieved rows are locked. C.The last row of the result set is locked. D.The rows not previously updated by another application are locked.
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