What is a Shared Pool?

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)

1. What does shared pool used for?
2. What is shared pool size?
3. What is shared pool in SQL?
4. Why do you need to flush a shared pool?
5. How do you flush a shared pool?
6. Is large pool part of shared pool?
7. How do I check my shared pool advisory?
8. What is Pga_aggregate_target?
9. What is Sga_max_size?
10. What is UGA in Oracle?
11. Which one is the part of shared pool?
12. How do I check my free memory in shared pool?

What does shared pool used for?

The shared pool is used to store SQL statements, and it includes the following components: Since it is not possible to dedicate separate regions of memory for the shared pool components, the shared pool is usually the second-largest SGA memory area (depending on the size of the db_cache_size parameter).

What is shared pool size?

SHARED_POOL_SIZE specifies (in bytes) the size of the shared pool. The shared pool contains shared cursors, stored procedures, control structures, and other structures. If you set PARALLEL_AUTOMATIC_TUNING to false , then Oracle also allocates parallel execution message buffers from the shared pool.

What is shared pool in SQL?

The shared pool is the area of the System Global Area (SGA) that contains structures such as the data dictionary cache and the shared SQL area. This is one of the most important storage structures in an Oracle database system.

Why do you need to flush a shared pool?

Flush Shared pool means flushing the cached execution plan and SQL Queries from memory. FLush buffer cache means flushing the cached data of objects from memory. Both is like when we restart the oracle database and all memory is cleared.

How do you flush a shared pool?

To clear the whole shared pool you would issue the following command from a privileged user. ALTER SYSTEM FLUSH SHARED_POOL; It's a really brutal thing to do as all parsed SQL will be thrown away. The database will have to do a lot of work to warm up the shared pool again with commonly used statements.

Is large pool part of shared pool?

The large pool does not have an LRU list. It is different from reserved space in the shared pool, which uses the same LRU list as other memory allocated from the shared pool. See Also: "Shared Server Architecture" for information about allocating session memory from the large pool for the shared server.

How do I check my shared pool advisory?

Check whether shared pool advisory is enable? If the value of statistic_level is TYPICAL/ALL, then shared pool advisory is enable. If it is set TO BASIC, then change the same using alter system command.

What is Pga_aggregate_target?

PGA_AGGREGATE_TARGET specifies the target aggregate PGA memory available to all server processes attached to the instance. Setting PGA_AGGREGATE_TARGET to a nonzero value has the effect of automatically setting the WORKAREA_SIZE_POLICY parameter to AUTO .

What is Sga_max_size?

SGA_MAX_SIZE specifies the maximum size of the SGA for the lifetime of the instance. On 64-bit platforms and non-Windows 32-bit platforms, when either MEMORY_TARGET or MEMORY_MAX_TARGET is specified, the default value of SGA_MAX_SIZE is set to the larger of the two parameters.

What is UGA in Oracle?

The UGA is memory allocated to hold a stock of user-detailed information, such as program variables, sorting and hash joins. In a Shared Server environment (the MTS), Oracle allocates UGA memory inside the Shared Pool.

Which one is the part of shared pool?

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)

How do I check my free memory in shared pool?

Free memory Shared pool : SELECT * FROM v$sgastat WHERE name = 'free memory'; News.