Database Management Systems

This characteristic of OLAP means that the system is targeted to deliver most responses to users within about five seconds with the simplest analyses taking no more than one second and very few taking more than 20 seconds.

This means that the system can cope with any business logic and statistical analysis, which is relevant for the application and the user.  

In this, data items are grouped according to logical relationships or customer preferences.

At specific times, all modified database buffers in the SGA are written to the datafiles by the database writer.

The information in a redo log file is used to recover the database from a media failure.

This memory component of the SGA contains modified blocks and clean or unchanged blocks.

A database is divided into logical storage units is called tablespace.

With real application, the system monitor process of one instance can perform instance recovery for instances.

The data of logical database storage structures such as tables and indexes are physically stored in the datafiles.

The redo entries stored in the redo log buffer are written to an online redo log.

This background process is responsible for signaling database writer at the check points and updating all the datafiles,  and control files.

This memory component of the SGA provides large memory allocations for Oracle backup and restore operations.

The entries such as the database identifier and name, redo log archive infoinformation, etc. are maintained in the control file.

A database uses and allocates free database space in oracle data blocks.

When the segment finishes execution, the extents in the temporary segment are returned to the system.