| TransactionalMapWrapper | OptimisticMapWrapper | PessimisticMapWrapper | |
|---|---|---|---|
|
Lost update |
Possible |
Not possible |
Not possible |
|
Dirty write |
Not possible |
Not possible |
Not possible |
|
Dirty read |
Not possible |
Not possible |
Not possible |
|
Lost update |
Possible |
Not possible |
Not possible |
|
Nonrepeatable read |
Possible |
Not possible |
Not possible |
|
Phantoms |
Possible |
Not possible |
Not possible |
|
Read Skew |
Possible |
Not possible |
Not possible |
|
Write Skew |
Possible |
Possible |
Not possible |
|
Readers block writers |
No |
No |
Yes |
|
Writers block readers |
No |
No |
Yes |
|
Writers block writers |
No |
No |
Yes |
|
Might deadlock |
No |
No |
Yes |
|
Commit might fail |
No |
Yes |
No |
|
Isolation Level |
Read Committed (with lost updates possible) |
Snapshot (Oracle would call it Serializable) |
Serializable |