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Large memory allocations, however, tended to get a chunk of memory, use it, and then were done with it there was no need to cache this memory What Oracle needed was something similar to the Recycle and Keep buffer pools implemented for the block buffer cache This is exactly what the Large pool and Shared pool are now The Large pool is a Recycle-style memory space, whereas the Shared pool is more like the Keep buffer pool if people appear to be using something frequently, then you keep it cached Memory allocated in the Large pool is managed in a heap, much in the way C manages memory via malloc() and free() As soon as you free a chunk of memory, it can be used by other processes In the Shared pool, there really was no concept of freeing a chunk of memory.

The PRODUCT_COMPONENT_VERSION view shows you at a glance the version numbers of all the major components of your Oracle database. Following is a typical query on this view: SQL> SELECT * FROM PRODUCT_COMPONENT_VERSION; PRODUCT VERSION STATUS -----------------------------------------------------------NLSRTL 10.2.0.0.0 Beta Oracle Database 10g Enterprise Edition 10.2.0.0.0 Beta PL/SQL 10.2.0.0.0 Beta TNS for Linux: 10.2.0.0.0 Beta SQL>

1. Ted Faison, Interaction Patterns for Communicating Processes (proceedings of PLoP98, Pattern Languages of Programs, Monticello, IL, August 1998, http://citeseer.ist.psu.edu/faison98interaction.html).

The DBA_REGISTRY view provides information about the different Oracle components that are installed, along with their version number, schemas, and other details. Listing 23-1 shows the contents of the DBA_REGISTRY view.

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You would allocate memory, use it, and then stop using it After a while, if that memory needed to be reused, Oracle would age out your chunk of memory The problem with using just a Shared pool is that one size doesn t always fit all..

Listing 23-1. Querying the DBA_REGISTRY View SQL> 2 3 4 5 SELECT comp_id, comp_name, version, status FROM DBA_REGISTRY ; VERSION ---------10.2.0.0.0 10.2.0.0.0 10.2.0.0.0 10.2.0.0.0 10.2.0.0.0 10.2.0.0.0 10.2.0.0.0 10.2.0.0.0 10.2.0.0.0 10.2.0.0.0 10.2.0.0.0 10.2.0.0.0 10.2.0.0.0 10.2.0.0.0 10.2.0.0.0 10.2.0.0.0 10.2.0.0.0 10.1.0.2.0 STATUS ------VALID VALID VALID VALID VALID VALID VALID VALID VALID VALID VALID VALID VALID VALID VALID VALID VALID VALID

The Large pool is used specifically by Shared server connections, to allocate the UGA region in the SGA Parallel execution of statements, to allow for the allocation of interprocess message buffers, which are used to coordinate the parallel query servers Backup for RMAN disk I/O buffers in some cases As you can see, none of these memory allocations should be managed in an LRU buffer pool designed to manage small chunks of memory With shared server connection memory, for example, once a session logs out, this memory is never going to be reused, so it should be immediately returned to the pool Also, shared server UGA memory allocation tends to be large If you review the earlier examples with the SORT_AREA_RETAINED_SIZE or PGA_ AGGREGATE_TARGET, the UGA can grow very large and is definitely bigger than 4KB chunks.

COMP_ID COMP_NAME ---------- ---------------------------------CATALOG Oracle Database Catalog Views CATPROC Oracle Database Packages and Types OWM Oracle Workspace Manager JAVAVM JServer JAVA Virtual XML Oracle XDK CATJAVA Oracle Database Java Packages EXF Oracle Expression Filter ORDIM Oracle interMedia ODM Oracle Data Mining CONTEXT Oracle Text XDB Oracle XML Database RUL Oracle Rules Manager OLAP Analytic Workspace XOQ Oracle OLAP API AMD OLAP Catalog SDO Spatial WK Oracle Ultra Search EM Oracle Enterprise Manager 18 rows selected. SQL>

Much of the work on software patterns centers on the structure, relationship, and organization of objects and classes The emphasis is on characterizing what objects do and what structure they have, especially in relationship to one another This inclination toward function and structure is due to the influence of Alexander s work 20 years ago,2 regarding the patterns adopted in the architecture of buildings and cities But software systems are more than collections of objects with a purpose They are rather like a group of people that accomplish a task by conversing or exchanging messages with one another Studying the dynamics of conversations can be useful, because it reveals that there are patterns in the way we communicate Implied assumptions, expectations, understandings, and goals drive entities to communicate.

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