pga mastercard

Label:Oracle Database creates and uses memory structures for various purposes. For example, memoryStores program code being run, data, was shared among users, and private data areas for eachConnected user.Both basic memory structures is associated with an instance:•System Global Area (SGA): Group of shared memory structures, known as SGAcomponents, which contain Dataand control information for one Oracle Database instance.The SGA is a shared by all server and background processes. Examples of da

system to hold the secondary database and the data pump files.2) a full database backup must exist, or at least the system -related tablespace exists.the following restrictions apply to the Rman recovery table or partition:1) SYS User table or partition cannot be recovered. 2) tables or partitions stored in the Sysaux and system table spaces cannot be recovered.3) You cannot use the Remap option to restore a table that contains a NOT NULL constraint. limit

Oracle memory: memory architecture: oracle database allocates memory and background processes whenever the database instance is started, the following information is stored in the memory area: program code and connection session information, even if the session is not active." Information required during program execution, information about data sharing locks. Buffered data, data blocks, redo log records, and so on. You can check the figure above: A) The basic memory structure includes the follo

Instance and a database (data file, control file, and redo log file). The so-called Instance is the medium for user interaction with the database, you can operate a database by connecting to an instance. The instance is composed of a unified memory structure (SGA, PGA, UGA) and a batch of memory resident processes. The instance is identified by ORACLE_SID in the operating system and the INSTANCE_NAME parameter in Oracle. The values of the two instanc

managed and allocated, and 11g can automatically manage SGA, you can also automatically manage PGA and manage these two parts comprehensively to automatically adjust the size of all memory areas. The default value is 0 in 11g. Now let's list the syntax of these parameters. This is a static parameter that needs to be restarted to take effect. Alter systemset memory_max_target = 1000 m scope = spfile;Alter system set memory_target = 1000 m scope = spfi

In Oracle, the memory structure mainly includes two categories: SGA and PGA. SGA represents the system global zone, and PGA represents the program global zone. Oracle memory mainly stores execution processes In Oracle, the memory structure mainly includes two categories: SGA and PGA. SGA represents the system global zone, and

ORACLE Database Performance Optimization-) memory disk1. Memory Structure Optimization Overview 1.1 buffer zone Buffer zones that affect database performance include SGA that can be shared and pga that are private to server processes, sga also includes the Shared Pool, large pool, java pool, data buffer, stream pool, and redo log buffer.1.2 Automatic Memory Management Oracle generally uses automatic memory management to manage system memory. oracle au

bridging sensor signals that require extremely high-precision measurements, many electronic scaling vendors have used an extremely low noise gain level to zoom in on signals from bridging before digitization. The gain-level bandwidth is usually not a big problem when the weights on many electronic scales change slowly. However, the key is that the gain level can be very stable in both temperature and time changes. Most electronic scales only require regular calibration by the manufacturer or us

"Meet the Cursor sharing condition. It can be shared before it is out of age or flushed out of memory. If the same SQL statement is issued for the second time, Shared Cursor is Shared, which is called Soft Parse. Private Cursor corresponds to Shared Cursor. Private Cursor is resident in the PGA space of the Server Process. When we issue an SQL statement or manually create a Cursor, a Private Cursor object is created in the

process that corresponds to a user process Shared service process (multitreaded server process): A service processing corresponds to multiple user processes and takes turns serving the user process. The dedicated server mode means that each time the Oracle server is accessed, the listener of the system receives the access request and then creates a new process for the access to service. So, for each client access, will generate a new process for service, is a similar one-to-one mapping relation

required. Soft parsing also requires scanning the library to cache object handle chains to find reusable parse trees and execution plans, so there is inevitably contention for library cache latch. But compared to hard parsing, the first, soft-analytic library cache latch contention is much less, the library cache latch holding time will be relatively short.SummarizeIf soft parsing is widely used in OLTP-type systems when executing target SQL, the performance and scalability of the system will b