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A database may use one or more methods to implement concurrency of use These include locking mechanisms to guarantee exclusive use of a table by a transaction, time-stamping methods that enable serialization of transactions, and the validation-based scheduling of transactions Locking methods are called pessimistic because they assume that transactions will violate the serializable schedules unless they re prevented explicitly from doing so The time-stamping and validation methods, on the other hand, are called optimistic because they don t assume that transactions are bound to violate the serializable schedules As you might guess, locking methods cause more delays than the optimistic methods because they keep conflicting transactions waiting for access to the locked database objects On the positive side, however, locking methods don t have to abort transactions because they prevent potentially conflicting transactions from interacting with other transactions.

The optimistic methods usually have to abort transactions when they might violate a serializable schedule Time-stamping methods assign time stamps to each transaction and enforce serializability by ensuring that the transaction time stamps match the schedule for the transactions Validation methods maintain a record of transaction activity Before committing a transaction, the database validates the changed data against the changed items of all currently active transactions to eliminate any unserialized schedules Oracle uses a combination of the available methods It uses locks along with what is called the multiversion concurrency control system (a variation of the time-stamping method) to manage concurrency Oracle locks prevent destructive interaction between transactions that are trying to access the same resource The resource could be an application table or row, or it could be a shared system data structure in memory It could also be a data dictionary table or row.

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Note If you see the temporary table generating more redo than the permanent table with the INSERT statement,

The following sort of behavior (that rows have no order) will be observed on tables of all sizes, in databases with any blocksize: ops$tkyte@ORA10GR1> create table t 2 ( a int, 3 b varchar2(4000) default rpad('*',4000,'*'), 4 c varchar2(3000) default rpad('*',3000,'*') 5 ) 6 / Table created ops$tkyte@ORA10GR1> insert into t (a) values ( 1); 1 row created ops$tkyte@ORA10GR1> insert into t (a) values ( 2); 1 row created ops$tkyte@ORA10GR1> insert into t (a) values ( 3); 1 row created..

Locks ensure data consistency while allowing data concurrency by letting multiple users simultaneously access the database Oracle does its locking implicitly; you don t have to worry about which table to lock or how to lock it, as Oracle will automatically place locks on your transaction s behalf when necessary By default, Oracle uses row-level locking, which involves the least restrictive amount of locking, thus guaranteeing the highest amount of concurrency By default, Oracle stores the locked row information in the data blocks Also, Oracle never uses lock escalation that is, it doesn t go from a lowerlevel granularity like row-level locking to a higher level of granularity like table-level locking.

you are observing a product issue in the database that is fixed in at least Oracle 9.2.0.6 and 10.1.0.4 patch releases and above.

Oracle s multiversion concurrency control system is a variation of the time-stamp approach to concurrency control; it maintains older versions of table data to ensure that any transaction can read the original data even after it has been changed by other transactions Unlike locking, no waits are involved here; transactions use different versions of the same table instead of waiting for other transactions to complete When transactions want to update a row, Oracle first writes the original beforeimage to an undo record in the undo tablespace Queries then have a consistent view of the data, which provides read consistency they only see data from a single point in time Using the same mechanism, Oracle is also capable of providing transaction-level read consistency, meaning that all the separate statements in a transaction see data from a single point in time.

ops$tkyte@ORA10GR1> delete from t where a = 2 ; 1 row deleted. ops$tkyte@ORA10GR1> insert into t (a) values ( 4); 1 row created. ops$tkyte@ORA10GR1> select a from t; A ---------1 4 3 Adjust columns B and C to be appropriate for your blocksize if you would like to reproduce this. For example, if you have a 2KB blocksize, you do not need column C, and column B should be a VARCHAR2(1500) with a default of 1,500 asterisks. Since data is managed in a heap in a table like this, as space becomes available, it will be reused.

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