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Oracle® Database PL/SQL Packages and Types Reference
10g Release 2 (10.2)

Part Number B14258-01
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95 DBMS_SERVICE

The DBMS_SERVICE package lets you create, delete, activate and deactivate services for a single instance.

The chapter contains the following topics:


Using DBMS_SERVICE

This section contains topics which relate to using the DBMS_SERVICE package.


Overview

DBMS_SERVICE supports the management of services in the RDBMS for the purposes of workload measurement, management, prioritization, and XA/and distributed transaction management.

Oracle Real Application Clusters (RAC) has a functionality to manage service names across instances. This package allows the creation, deletion, starting and stopping of services in both RAC and a single instance. Additionally it provides the ability to disconnect all sessions which connect to the instance with a service name when RAC removes that service name from the instance.

See Also:

For more information about Oracle Real Application Clusters, Oracle Database Oracle Clusterware and Oracle Real Application Clusters Administration and Deployment Guide.

Security Model

Privileges

The client using this package should have the ALTER SYSTEM execution privilege and the V$SESSION table read privilege.

Schemas

This package should be installed under SYS schema.

Roles

The EXECUTE privilege of the package is granted to the DBA role only.


Constants

The DBMS_SERVICE package uses the constants shown in following tables

Table 95-1 Constants used in Calling Arguments

Name Type Value Description
GOAL_NONE NUMBER 0 Disables Load Balancing Advisory
GOAL_SERVICE_TIME NUMBER 1 Load Balancing Advisory is based on elapsed time for work done in the service plus available bandwidth to the service
GOAL_THROUGHPUT NUMBER 2 Load Balancing Advisory is based on the rate that work is completed in the service plus available bandwidth to the service

Table 95-2 Constants used in Connection Balancing Goal Arguments

Name Type Value Description
CLB_GOAL_SHORT NUMBER 1 Connection load balancing uses Load Balancing Advisory, when Load Balancing Advisory is enabled (either goal_service_time or goal_throughput). When GOAL=NONE (no load balancing advisory), connection load balancing uses an abridged advice based on CPU utilization.
CLB_GOAL_LONG NUMBER 2 Balances the number of connections per instance using session count per service. This setting is recommended for applications with long connections such as forms. This setting can be used with Load Balancing Advisory when the connection pool is sized to accommodate gravitation within the pool itself (without adding or removing connections). The latter is the most efficient design.

Table 95-3 Constants used in TAF Failover Attribute Arguments

Name Type Value Description
FAILOVER_METHOD_NONE VARCHAR2 0 Server side TAF is not enabled for this service
FAILOVER_METHOD_BASIC VARCHAR2 1 Server side TAF method is BASIC. BASIC is the only value currently supported. This means that a new connection is established at failure time. It is not possible to pre-establish a backup connection. (which is to say, PRECONNECT is not supported)
FAILOVER_TYPE_NONE NUMBER
Server side TAF type is NONE
FAILOVER_TYPE_SESSION NUMBER
Server side TAF failover type is SESSION. At failure time, if the failover type is SESSION, TAF will re-connect to a surviving node and re-establish a vanilla database session. Customizations (for example, ALTER SESSION) must be re-executed in a failover callback.
FAILOVER_TYPE_SELECT NUMBER
Server side TAF failover type is SELECT
FAILOVER_RETRIES NUMBER
Number of retries to use during a failover. Specifies the number of times that TAF should attempt the re-connect and re-authenticate pair. The value must be integral and greater than 0. The maximum value is UB4MAXVAL
FAILOVER_DELAY NUMBER
Number of seconds delay before trying to failover. Specifies the delay (in seconds) that TAF will incur if the re-connect / re-authentication fails. The value must be integral and greater than 0. The maximum value is UB4MAXVAL.

Usage Notes


Exceptions

The following table lists the exceptions raised by DBMS_SERVICE package.

Table 95-4 DBMS_SERVICE Exceptions

Exception Error Code Description
NULL_SERVICE_NAME 44301 The service name argument was found to be NULL
NULL_NETWORK_NAME 44302 The network name argument was found to be NULL
SERVICE_EXISTS 44303 This service name was already in existence
SERVICE_DOES_NOT_EXIST 44304 The specified service was not in existence
SERVICE_IN_USE 44305 The specified service was running
SERVICE_NAME_TOO_LONG 44306 The service name was too long
NETWORK_PREFIX_TOO_LONG 44307 The network name, excluding the domain, was too long
NOT_INITIALIZED 44308 The services layer was not yet initialized
GENERAL_FAILURE 44309 There was an unknown failure
MAX_SERVICES_EXCEEDED 44310 The maximum number of services has been reached
SERVICE_NOT_RUNNING 44311 The specified service was not running
DATABASE_CLOSED 44312 The database was closed
INVALID_INSTANCE 44313 The instance name argument was not valid
NETWORK_EXISTS 44314 The network name was already in existence
NULL_ATTRIBUTES 44315 All attributes specified were NULL
INVALID_ARGUMENT 44316 Invalid argument supplied
DATABASE_READONLY 44317 The database is open read-only
MAX_SN_LENGTH 44318 The total length of all running service network names exceeded the maximum allowable length


Summary of DBMS_SERVICE Subprograms

Table 95-5 DBMS_SERVICE Package Subprograms

Subprogram Description
CREATE_SERVICE Procedure
Creates service
DELETE_SERVICE Procedure
Deletes service
DISCONNECT_SESSION Procedure
Disconnects service
MODIFY_SERVICE Procedure
Modifies service
START_SERVICE Procedure
Activates service
STOP_SERVICE Procedure
Stops service


CREATE_SERVICE Procedure

This procedure creates a service name in the data dictionary. Services are also created in the data dictionary implicitly when you set the service in the service_name parameter or by means of the ALTER SYSTEM SET SERVICE_NAMES command.

Syntax

DBMS_SERVICE.CREATE_SERVICE(
   service_name        IN VARCHAR2, 
   network_name        IN VARCHAR2,
   goal                IN NUMBER DEFAULT NULL,
   dtp                 IN BOOLEAN DEFAULT NULL,
   aq_ha_notifications IN BOOLEAN DEFAULT NULL,
   failover_method     IN VARCHAR2 DEFAULT NULL,
   failover_type       IN VARCHAR2 DEFAULT NULL,
   failover_retries    IN NUMBER DEFAULT NULL,
   failover_delay      IN NUMBER DEFAULT NULL,
   clb_goal            IN NUMBER DEFAULT NULL);

Parameters

Table 95-6 CREATE_SERVICE Procedure Parameters

Parameter Description
service_name The name of the service limited to 64 characters in the Data Dictionary
network_name The network name of the service as used in SQLNet connect descriptors for client connections. This is limited to the NET service_names character set (see Oracle Database Net Services Reference).
goal The workload management goal directive for the service. Valid values:
  • DBMS_SERVICE.GOAL_SERVICE_TIME

  • DBMS_SERVICE.GOAL_THROUGHPUT

  • DBMS_SERVICE.GOAL_NONE

dtp Declares the service to be for DTP or distributed transactions including XA transactions
aq_ha_notifications Determines whether HA events are sent via AQ for this service
failover_method The TAF failover method for the service
failover_type The TAF failover type for the service
failover_retries The TAF failover retries for the service
failover_delay The TAF failover delay for the service
clb_goal Method used for Connection Load Balancing (see Table 95-2, "Constants used in Connection Balancing Goal Arguments")

Examples

DBMS_SERVICE.CREATE_SERVICE('ernie.us.oracle.com','ernie.us.oracle.com');

DELETE_SERVICE Procedure

This procedure deletes a service from the data dictionary.

Syntax

DBMS_SERVICE.DELETE_SERVICE(
   service_name   IN VARCHAR2);

Parameters

Table 95-7 DELETE_SERVICE Procedure Parameters

Parameter Description
service_name The name of the service limited to 64 characters in the Data Dictionary

Examples

DBMS_SERVICE.DELETE_SERVICE('ernie.us.oracle.com');

DISCONNECT_SESSION Procedure

This procedure disconnects sessions with the named service at the current instance.

Syntax

DBMS_SERVICE.DISCONNECT_SESSION(
   service_name   IN VARCHAR2);

Parameters

Table 95-8 DISCONNECT_SESSION Procedure Parameters

Parameter Description
service_name The name of the service limited to 64 characters in the Data Dictionary

Usage Notes

Examples

This disconnects sessions with service_name 'ernie.us.oracle.com'.

DBMS_SERVICE.DISCONNECT_SESSION('ernie.us.oracle.com');

MODIFY_SERVICE Procedure

This procedure modifies an existing service.

Syntax

DBMS_SERVICE.MODIFY_SERVICE(
   service_name        IN VARCHAR2, 
   goal                IN NUMBER DEFAULT NULL,
   dtp                 IN BOOLEAN DEFAULT NULL,
   aq_ha_notifications IN BOOLEAN DEFAULT NULL,
   failover_method     IN VARCHAR2 DEFAULT NULL,
   failover_type       IN VARCHAR2 DEFAULT NULL,
   failover_retries    IN NUMBER DEFAULT NULL,
   failover_delay      IN NUMBER DEFAULT NULL,
   clb_goal            IN NUMBER DEFAULT NULL);

Parameters

Table 95-9 MODIFY_SERVICE Procedure Parameters

Parameter Description
service_name The name of the service limited to 64 characters in the Data Dictionary
goal The workload management goal directive for the service. Valid values:
  • DBMS_SERVICE.GOAL_SERVICE_TIME

  • DBMS_SERVICE.GOAL_THROUGHPUT

  • DBMS_SERVICE.GOAL_NONE

dtp Declares the service to be for DTP or distributed transactions including XA transactions
aq_ha_notifications Determines whether HA events are sent via AQ for this service
failover_method The TAF failover method for the service
failover_type The TAF failover type for the service
failover_retries The TAF failover retries for the service
failover_delay The TAF failover delay for the service
clb_goal Method used for Connection Load Balancing (see Table 95-2, "Constants used in Connection Balancing Goal Arguments")


START_SERVICE Procedure

This procedure starts a service. This procedure alters the service_name IOP to contain this service_name. In RAC, implementing this option will act on the instance specified.

Syntax

DBMS_SERVICE.START_SERVICE(
   service_name  IN VARCHAR2, 
   instance_name IN VARCHAR2);

Parameters

Table 95-10 START_SERVICE Procedure Parameters

Parameter Description
service_name The name of the service limited to 64 characters in the Data Dictionary
instance_name The name of the instance where the service should be activated (optional). The instance on which to start the service. NULL results in starting of the service on the local instance. In single instance this can only be the current instance or NULL. Specify DBMS_SERVICE.ALL_INSTANCES to start the service on all configured instances.

Examples

DBMS_SERVICE.START_SERVICE('ernie.us.oracle.com');

STOP_SERVICE Procedure

This procedure stops a service, altering the service_name IOP to remove this service_name. In RAC this will call out to CRS to stop the service optionally on the instance specified.

Syntax

DBMS_SERVICE.STOP_SERVICE(
   service_name   IN VARCHAR2,
   instance_name  IN VARCHAR2);

Parameters

Table 95-11 STOP_SERVICE Procedure Parameters

Parameter Description
service_name The name of the service limited to 64 characters in the Data Dictionary
instance_name The name of the instance where the service should be stopped (optional). The instance on which to stop the service. NULL results in stopping of the service locally. n single instance this can only be the current instance or NULL. The default in RAC and exclusive case is NULL. Specify DBMS_SERVICE.ALL_INSTANCES to stop the service on all configured instances.

Examples

DBMS_SERVICE.STOP_SERVICE('ernie.us.oracle.com');