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Oracle9i Supplied PL/SQL Packages and Types Reference
Release 2 (9.2)

Part Number A96612-01
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DBMS_SHARED_POOL, 2 of 2


Summary of DBMS_SHARED_POOL Subprograms

Table 66-1 DBMS_SHARED_POOL Subprograms
Subprogram Description

SIZES Procedure

Shows objects in the shared pool that are larger than the specified size

KEEP Procedure

Keeps an object in the shared pool

UNKEEP Procedure

Unkeeps the named object

ABORTED_REQUEST_THRESHOLD Procedure

Sets the aborted request threshold for the shared pool

SIZES Procedure

This procedure shows objects in the shared_pool that are larger than the specified size. The name of the object is also given, which can be used as an argument to either the KEEP or UNKEEP calls.

Syntax

DBMS_SHARED_POOL.SIZES ( 
   minsize NUMBER);

Parameters

Table 66-2 SIZES Procedure Parameters
Parameter Description

minsize

Size, in kilobytes, over which an object must be occupying in the shared pool, in order for it to be displayed.

Usage Notes

Issue the SQLDBA or SQLPLUS 'SET SERVEROUTPUT ON SIZE XXXXX' command prior to using this procedure so that the results are displayed.

KEEP Procedure

This procedure keeps an object in the shared pool. Once an object has been kept in the shared pool, it is not subject to aging out of the pool. This may be useful for frequently used large objects. When large objects are brought into the shared pool, several objects may need to be aged out to create a contiguous area large enough.

Syntax

DBMS_SHARED_POOL.KEEP (
   name VARCHAR2, 
   flag CHAR      DEFAULT 'P');

Note:

This procedure may not be supported in the future if automatic mechanisms are implemented to make this unnecessary.


Parameters

Table 66-3 KEEP Procedure Parameters
Parameter Description

name

Name of the object to keep.

The value for this identifier is the concatenation of the address and hash_value columns from the v$sqlarea view. This is displayed by the SIZES procedure.

Currently, TABLE and VIEW objects may not be kept.

flag

(Optional) If this is not specified, then the package assumes that the first parameter is the name of a package/procedure/function and resolves the name.

Set to 'P' or 'p' to fully specify that the input is the name of a package/procedure/function.

Set to 'T' or 't' to specify that the input is the name of a type.

Set to 'R' or 'r' to specify that the input is the name of a trigger.

Set to 'Q' or 'q' to specify that the input is the name of a sequence.

In case the first argument is a cursor address and hash-value, the parameter should be set to any character except 'P' or 'p' or 'Q' or 'q' or 'R' or 'r' or 'T' or 't'.

Exceptions

An exception is raised if the named object cannot be found.

Usage Notes

There are two kinds of objects:

For example:

DBMS_SHARED_POOL.KEEP('scott.hispackage') 

This keeps package HISPACKAGE, owned by SCOTT. The names for PL/SQL objects follow SQL rules for naming objects (for example, delimited identifiers and multibyte names are allowed). A cursor can be kept by DBMS_SHARED_POOL.KEEP('0034CDFF, 20348871'). The complete hexadecimal address must be in the first 8 characters.

UNKEEP Procedure

This procedure unkeeps the named object.

Syntax

DBMS_SHARED_POOL.UNKEEP (
   name VARCHAR2, 
   flag CHAR     DEFAULT 'P');

Caution:

This procedure may not be supported in the future if automatic mechanisms are implemented to make this unnecessary.


Parameters

Table 66-4 UNKEEP Procedure Parameters
Parameter Description

name

Name of the object to unkeep. See description of the name object for the KEEP procedure.

flag

See description of the flag parameter for the KEEP procedure.

Exceptions

An exception is raised if the named object cannot be found.

ABORTED_REQUEST_THRESHOLD Procedure

This procedure sets the aborted request threshold for the shared pool.

Syntax

DBMS_SHARED_POOL.ABORTED_REQUEST_THRESHOLD (
   threshold_size NUMBER);

Parameters

Table 66-5 ABORTED_REQUEST_THRESHOLD Procedure Parameters
Parameter Description

threshold_size

Size, in bytes, of a request which does not try to free unpinned (not "unkeep-ed") memory within the shared pool. The range of threshold_size is 5000 to ~2 GB inclusive.

Exceptions

An exception is raised if the threshold is not in the valid range.

Usage Notes

Usually, if a request cannot be satisfied on the free list, then the RDBMS tries to reclaim memory by freeing objects from the LRU list and checking periodically to see if the request can be fulfilled. After finishing this step, the RDBMS has performed a near equivalent of an 'ALTER SYSTEM FLUSH SHARED_POOL'.

Because this impacts all users on the system, this procedure "localizes" the impact to the process failing to find a piece of shared pool memory of size greater than thresh_hold size. This user gets the 'out of memory' error without attempting to search the LRU list.


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