A database instance (Server) is a set of memory structure and background processes that access a set of database files. The process can be shared by all users. The
Latest Answer : Database instance(server) is the combination of memory structure and background process. It's a way to connect to the oracle database. ...
Latest Answer : The basic memory structures associated with Oracle include: • System Global Area (SGA), which is shared by all server and background processes and holds the following: o Database buffer cache o Redo log buffer o Shared ...
Latest Answer : PGA Program global area Contains Session variables ,Stack space,Cursor status ,Sort Areas ...
Latches are low level serialization mechanisms used to protect shared data structures in the SGA. The implementation of latches is operating system dependent, particularly in regard to whether a process
Latest Answer : Latches are simple, low-level serialization mechanisms to protect shared data structures in the system global area (SGA). For example, latches protect the list of users currently accessing the database and protect the data structures describing the blocks ...
Enqueues are another type of locking mechanism used in Oracle. An enqueue is a more sophisticated mechanism which permits several concurrent processes to have varying degree of sharing of "known"
Latest Answer : An enqueue is a sophisticated locking mechanism that permits several concurrent processes to share known resources to varying degrees. Any object that can be used concurrently can be protected with enqueues. For example, Oracle allows varying levels of ...
Latest Answer : Thanks for the information! ...
Latest Answer : It depends on your requirement, if you want no of users around 300 then you can still achieve that by keeping PGA parameters low. If you are looking for number of users 1000 or even more, you need to go for shared server mode. ...
Hi, I've recently commissioned a hosted system from a developer who has recommended using J2EE and Oracle. Their J2EE system is quite slick and works very well in preproduction. It uses annotations
Latest Answer : Changing VARCHAR2(255) to precise required width is good table design. Though it will not improve performance as such. ...
What is Oracle Reserved Memory and Unreserved Memory? What is the size of Oracle Reserved Memory?
Latest Answer : Is the meomory that is allocated to each connection to Oracle, this memory is not recliamed even if the session is inactiveit is recliamed if the session is disconnected onlyto see it:D:appadminproduct11.1.0db11gBINorastack oracle.exe to change it to ...
