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This is generally considered the most restrictive level of transaction isolation, but it provides the highest degree of isolation. A SERIALIZABLE transaction operates in an environment that makes it appear as if there are no other users modifying data in the database. Any row we read is assured to be the same upon a reread, and any query we execute is guaranteed to return the same results for the life of a transaction. For example, if we execute Select * from T; Begin dbms_lock.sleep( 60*60*24 ); end; Select * from T; the answers returned from T would be the same, even though we just slept for 24 hours (or we might get an ORA-01555, snapshot too old error, which is discussed in 8). The isolation level SERIALIZABLE assures us these two queries will always return the same results. Side effects (changes) made by other transactions are not visible to the query regardless of how long it has been running. In Oracle, a SERIALIZABLE transaction is implemented so that the read consistency we normally get at the statement level is extended to the transaction.

This query is compiled once, and then the query plan is stored in a shared pool (the library cache), from which it can be retrieved and reused The difference between the two in terms of performance and scalability is huge dramatic, even From the previous description, it should be fairly obvious that parsing a statement with hard-coded variables (called a hard parse) will take longer and consume many more resources than reusing an already parsed query plan (called a soft parse) What may not be so obvious is the extent to which the former will reduce the number of users your system can support This is due in part to the increased resource consumption, but an even larger factor arises due to the latching mechanisms for the library cache.

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In this code snippet, a join point for a field s write access encompasses an assignment to _accountNumber in the constructor. Exception handler execution join points The exception handler execution join points represent the handler block of an exception type. Think of these join points as the catch blocks associated with an exception type. These join points are useful in enforcing certain policies regarding exception handling. This code shows the execution join points:

ONLY. It has all of the qualities of the SERIALIZABLE isolation level, but it prohibits modifications. It should be noted that the SYS user (or users connected as SYSDBA) can t have a READ ONLY or SERIALIZABLE transaction. SYS is special in this regard.

When you hard-parse a query, the database will spend more time holding certain low-level serialization devices called latches (see 6 for more details) These latches protect the data structures in the shared memory of Oracle from concurrent modifications by two sessions (otherwise Oracle would end up with corrupt data structures) and from someone reading a data structure while it is being modified The longer and more frequently you have to latch these data structures, the longer the queue to get these latches will become You will start to monopolize scarce resources Your machine may appear to be underutilized at times, and yet everything in the database is running very slowly The likelihood is that someone is holding one of these serialization mechanisms and a line is forming you are not able to run at top speed.

Instead of results being consistent with respect to the start of a statement, they are preordained at the time you begin the transaction. In other words, Oracle uses the undo segments to reconstruct the data as it existed when our transaction began, instead of just when our statement began. That s a pretty deep thought there: the database already knows the answer to any question you might ask it, before you ask it. This degree of isolation comes with a price, and that price is the following possible error: ERROR at line 1: ORA-08177: can't serialize access for this transaction You will get this message whenever you attempt to update a row that has changed since your transaction began.

try { account.debit(amount); } catch (InsufficientBalanceException ex) { postMessage(ex); OverdraftManager.applyOverdraftProtection(account, amount); }

Note Oracle attempts to do this purely at the row level, but you may receive an ORA-08177 error even when the

It only takes one ill-behaved application in your database to dramatically affect the performance of every other application A single, small application that does not use bind variables will cause the SQL of other well-designed applications to get discarded from the shared pool over time That will cause the welldesigned applications to have to hard-parse their SQL all over again as well You only need one bad apple to spoil the entire barrel..

row you are interested in modifying has not been modified. The ORA-08177 error may happen due to some other row(s) being modified on the block that contains your row.

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