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Here s a brief summary of how Oracle s transactions most commonly use the Oracle locking features: The transaction that contains a DML statement acquires exclusive row locks on the rows modified by a statement within the transaction. Until this transaction commits or rolls back, other transactions can t update or delete these rows. A query in a transaction can see only committed changes made by earlier statements in the same transaction, but won t be able to see data committed by other transactions after it started. In addition to the exclusive row locks, a transaction that contains a DML statement acquires at least a row exclusive table lock on the table that contains the rows. If it s already holding a more restrictive table-level DML lock, it retains the more restrictive lock. Oracle offers other kinds of table locks besides the row exclusive lock described previously, but they are not important for our purposes here. All you need to understand is that Oracle uses rowlevel locking for updates, inserts, and deletes, and that it also automatically imposes a row exclusive table lock during these operations.

Under automatic SGA memory management, the primary parameter for sizing the autotuned components is SGA_TARGET, which may be dynamically sized while the database is up and running, up to the setting of the SGA_MAX_SIZE parameter (which defaults to be equal to the SGA_TARGET, so if you plan on increasing the SGA_TARGET, you must have set the SGA_MAX_ SIZE larger before starting the database instance). The database will use the SGA_TARGET value, minus the size of any of the other manually sized components such as the DB_KEEP_CACHE_ SIZE, DB_RECYCLE_CACHE_SIZE, and so on, and use that amount of memory to size the default buffer pool, Shared pool, Large pool, and Java pool. Dynamically at runtime, the instance will allocate and reallocate memory between those four memory areas as needed. Instead of returning an ORA-04031 Unable to allocate N bytes of shared memory error to a user when the Shared pool runs out of memory, the instance could instead choose to shrink the buffer cache by some number of megabytes (a granule size) and increase the Shared pool by that amount. Over time, as the memory needs of the instance are ascertained, the size of the various SGA components would become more or less fixed in size. The database also remembers the sizes of these four components across database startup and shutdown so that it doesn t have to start all over again figuring out the right size for your instance each time. It does this via four double-underscore parameters: __DB_CACHE_SIZE, __JAVA_POOL_SIZE, __LARGE_POOL_SIZE, and __SHARED_POOL_SIZE. During a normal or immediate shutdown, the database will record these values to the stored parameter file and use them upon startup to set the default sizes of

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As you ve seen, Oracle automatically places DML locks on tables that are in the process of having some of their rows modified by a transaction. In addition, such a transaction simultaneously holds a table-level DDL lock on the table, which will prevent other transactions from altering or dropping the table while its DML transactions aren t yet completed. You can also place DDL locks on tables when you are conducting a purely DDL operation, without any accompanying DML transaction.

When changes occur in the model, a change notification is broadcast to all viewers In response, the latter usually refresh all or part of a window Viewers have no knowledge of each other and are controlled by the model s notifications..

Latches are internal mechanisms that protect shared data structures in the SGA. For example, data dictionary entries are accessed in the buffer by many processes, and latches control the processes access to these memory structures. The data structures that list the blocks currently in memory are also frequently consulted during the running of the Oracle instance, and server and background processes that need to change or read the data in critical data structures such as these would acquire a very short lock (called a latch, in this instance) on the object. The implementation of latches, including the specification of how long a process will wait for it, is usually specific to the operating system. Data dictionary locks are used by Oracle whenever the dictionary objects are being modified. Distributed locks are specialized locking mechanisms used in a distributed database system or in the Oracle Real Application Clusters (RAC) environment. Internal locks are used by Oracle to protect access to structures such as data files, tablespaces, and rollback segments.

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