What are the components of SGA?
Table of Contents
What are the components of SGA?
The SGA contains the following data structures: Database buffer cache….Automatically Managed SGA Components
- The shared pool (for SQL and PL/SQL execution)
- The Java pool (for Java execution state)
- The large pool (for large allocations such as RMAN backup buffers)
- The buffer cache.
- The Streams pool.
What is Oracle SGA parameter?
Parameter SGA_MAX_SIZE holds the maximum size that System Global Area (SGA) can reach for a particular instance. Oracle Database can change its SGA configuration while the instance is running. This allows sizes of the buffer cache, shared pool, and the large pool to be changed without an instance shutdown.
What is stored in the library cache?
The library cache is sometimes referred to as the shared SQL area. As the name implies, the shared SQL area is used to keep and process SQL statements and PL/SQL code. The library cache contains all shared structures. This includes: The SQL or PL/SQL source statements (SQL, stored procedures, packages)
The shared pool is an area of Oracle memory that includes two main structures: The library cache, which stores parsed SQL and PL/SQL statements. The dictionary cache, which stores the Oracle data dictionary (or Oracle metadata)
Which of the following is not valid is PL SQL?
Which SQL function is used to count the number of rows in a SQL query?…
| Q. | Which of the following is NOT VALID is PL/SQL? |
|---|---|
| C. | deptnamedept.dname\%type; |
| D. | date1 date := sysdate |
| Answer» b. NUM1, NUM2 number; |
What is SGA Oracle architecture?
The basic memory structures associated with Oracle Database include: System global area (SGA) The SGA is a group of shared memory structures, known as SGA components, that contain data and control information for one Oracle Database instance. The SGA is shared by all server and background processes.
What is parsed SQL?
The SQL PARSE function is a SQL Conversions Function used to convert the String data to the requested data type and returns the result as an expression. It is recommended to use this SQL PARSE function to convert the string data to either Date time, or Number type.
What are bind variables in SQL?
Bind variables are variables you create in SQL*Plus and then reference in PL/SQL. If you create a bind variable in SQL*Plus, you can use the variable as you would a declared variable in your PL/SQL subprogram and then access the variable from SQL*Plus.
What is SQL area?
V$SQLAREA lists statistics on shared SQL area and contains one row per SQL string. It provides statistics on SQL statements that are in memory, parsed, and ready for execution.
What is SGA memory?
The System Global Area (SGA) is a group of shared memory structures, known as SGA components, that contain data and control information for one Oracle Database instance. The SGA is shared by all server and background processes. Examples of data stored in the SGA include cached data blocks and shared SQL areas.
What is SGA and PGA in Oracle?
Basic Memory Structures The SGA is a group of shared memory structures, known as SGA components, that contain data and control information for one Oracle Database instance. A PGA is a nonshared memory region that contains data and control information exclusively for use by an Oracle process.
What are the components of the SGA?
The SGA consists of the following components. All SGA components allocote and deallocate areas in units of granules. In many SGAs smaller than 1 GB, the granule size is 4 MB. In large SGAs the granule size is 16 MB. What is SGA_TARGET? If you do not set the SGA_TARGET initialization parameter, you must set the above components one by one.
It is also known as the “Shared Global Area”. The SGA consists of the following components. All SGA components allocote and deallocate areas in units of granules. In many SGAs smaller than 1 GB, the granule size is 4 MB.
How to increase the SGA_target of a database?
There is a SGA_MAX_SIZE parameter. This parameter specifies the maximum memory that the SGA can reach. When you change this parameter, you need to restart the instances used by the database. You can increase SGA_TARGET to SGA_MAX_SIZE without performing any restart operation.