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The multiversion concurrency control system used by Oracle enables you to get by with the less-stringent readcommitted mode of isolation instead of having to use the slower but safer serializable isolation level Here are some important features of Oracle locking: Oracle implements locks by setting a bit in the data item being locked The locking information is stored in the data block where the row lives Locks are held for the entire length of a transaction and are released when a COMMIT or a ROLLBACK statement is issued..

Before we examine the rest of the processes, let s discuss why there are three main connection modes and when one might be more appropriate than the other.

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Oracle doesn t use lock escalation. Oracle doesn t need to escalate locks, as it stores the locking information in the individual data blocks. Lock escalation for example, an escalation from the row level to the table level reduces concurrency. Oracle does use lock conversion, which involves changing the restrictiveness of a lock while keeping the granularity of the lock the same. For example, a row share table lock is converted into a more restrictive row exclusive table lock when a SELECT FOR UPDATE statement starts updating the previously locked rows in the table. I explain locking granularity and Oracle locking types in more detail in the following sections. In the next few sections, you ll learn more about the locking methods and lock types used by Oracle s concurrency control mechanism.

Note When using ASSM or MSSM, you ll find rows end up in different places. The underlying space

Oracle uses locks to control access to two broad types of objects: user objects, which include tables, and system objects, which may include shared memory structures and data dictionary objects. Oracle follows a pessimistic locking approach, which anticipates potential conflicts and will block some transactions from interfering with others in order to avoid conflicts between concurrent transactions. Granularity, in the context of locking, is the size of the data unit locked by the locking mechanism. Oracle uses row-level granularity to lock objects, which is the finest level of granularity (exclusive table locking is the most coarse level). Several databases, including Microsoft SQL Server, provide only page-level, not row-level, locking. A page is somewhat similar to an Oracle data block, and it can have a bunch of rows, so page-level locking means that during an update, several rows in addition to the rows of interest are locked; if other users need the locked rows that are not part of the update, they have to wait for the lock on the page to be released. For example, if your page size is 8KB, and the average row length in a table is 100 bytes, about 80 rows can fit in that one page. If one of the rows is being updated, a block-level lock limits access to the other 79 rows in the block. Locking at a level larger than the row level would reduce data concurrency.

As noted previously, in dedicated server mode there is a one-to-one mapping between client connection and server process. This is by far the most common method of connection to the Oracle database for all SQL-based applications. It is the simplest to set up and provides the easiest way to establish connections. It requires little to no configuration. Since there is a one-to-one mapping, you do not have to be concerned that a long-running transaction will block other transactions. Those other transactions will simply proceed via their own dedicated processes. Therefore, it is the only mode you should consider using in a non-OLTP environment where you may have long-running transactions. Dedicated server is the recommended configuration for Oracle, and it scales rather nicely. As long as your server has sufficient hardware (CPU and RAM) to service the number of dedicated server processes your system needs, dedicated server may be used for thousands of concurrent connections. Certain operations must be done in a dedicated server mode, such as database startup and shutdown, so every database will have either both or just a dedicated server set up.

Remember, the coarser the locking granularity, the more serializable the transactions, and thus the fewer the concurrency anomalies. The flip side of this is that the coarser the granularity level, the lower the concurrency level. Oracle locks don t prevent other users from reading a table s data, and by default, queries never place locks on tables.

management routines are very different, and the same operations executed against a table in ASSM and MSSM may well result in different physical order. The data will logically be the same, but it will be stored in different ways.

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