Skip Headers
Oracle® Database Reference
12c Release 1 (12.1)

E17615-24
Go to Documentation Home
Home
Go to Book List
Book List
Go to Table of Contents
Contents
Go to Index
Index
Go to Master Index
Master Index
Go to Feedback page
Contact Us

Go to previous page
Previous
Go to next page
Next
PDF · Mobi · ePub

SHARED_POOL_SIZE

Property Description
Parameter type Big integer
Syntax SHARED_POOL_SIZE = integer [K | M | G]
Default value If SGA_TARGET is set: If the parameter is not specified, then the default is 0 (internally determined by the Oracle Database). If the parameter is specified, then the user-specified value indicates a minimum value for the memory pool.

If SGA_TARGET is not set (32-bit platforms): 64 MB, rounded up to the nearest granule size.

If SGA_TARGET is not set (64-bit platforms): 128 MB, rounded up to the nearest granule size.

For considerations when dealing with database instances using Oracle ASM, see "SHARED_POOL_SIZE and Automatic Storage Management".

Modifiable ALTER SYSTEM
Range of values Minimum: the granule size

Maximum: operating system-dependent

Basic No

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. Larger values improve performance in multiuser systems. Smaller values use less memory.

You can monitor utilization of the shared pool by querying the view V$SGASTAT.

See Also:

SHARED_POOL_SIZE and Automatic Storage Management

On a database instance using Oracle Automatic Storage Management (Oracle ASM), additional memory is required to store extent maps. As a general guideline, you can aggregate the values from the following queries to obtain current database storage size that is either already on Oracle ASM or will be stored in Oracle ASM. Then determine the redundancy type that is used (or will be used), and calculate the value for SHARED_POOL_SIZE, using the aggregated value as input.

SELECT SUM(BYTES)/(1024*1024*1024) FROM V$DATAFILE;
SELECT SUM(BYTES)/(1024*1024*1024) FROM V$LOGFILE a, V$LOG b
WHERE a.group#=b.group#;
SELECT SUM(BYTES)/(1024*1024*1024) FROM V$TEMPFILE WHERE
status='ONLINE';

Additionally, keep the following guidelines in mind: