Oracle的sys_context函数

Return Value

Identifies the position in the module (application name) and is set through the DBMS_APPLICATION_INFO package or OCI.

SELECTsys_context('USERENV', 'ACTION') FROM dual;

exec dbms_application_info.set_action('INSERTING');

SELECTsys_context('USERENV', 'ACTION') FROM dual;

Returns the cursor ID of the SQL that triggered the audit. This parameter is not valid in a fine-grained auditing environment. If you specify it in such an environment, Oracle Database always returns NULL.

Returns the identity used in authentication. In the list that follows, the type of user is followed by the value returned:

• Kerberos-authenticated enterprise user: kerberos principal name
• Kerberos-authenticated external user : kerberos principal name; same as the schema name
• SSL-authenticated enterprise user: the DN in the user's PKI certificate
• SSL-authenticated external user: the DN in the user's PKI certificate
• Password-authenticated enterprise user: nickname; same as the login name
• Password-authenticated database user: the database username; same as the schema name
• OS-authenticated external user: the external operating system user name
• Radius/DCE-authenticated external user: the schema name
• Proxy with DN : Oracle Internet Directory DN of the client
• Proxy with certificate: certificate DN of the client
• Proxy with username: database user name if client is a local database user; nickname if client is an enterprise user
• SYSDBA/SYSOPER using Password File: login name
• SYSDBA/SYSOPER using OS authentication: operating system user name

​​Data​​ being used to authenticate the login user. For X.503 certificate authenticated sessions, this field returns the context of the certificate in HEX2 format.

Note:You can change the return value of the AUTHENTICATION_DATA attribute using the length parameter of the syntax. Values of up to 4000 are accepted. This is the only attribute of USERENV for which Oracle implements such a change.

Returns the method of authentication. In the list that follows, the type of user is followed by the method returned.

• Password-authenticated enterprise user, local database user, or SYSDBA/SYSOPER using Password File; proxy with username using password: PASSWORD
• Kerberos-authenticated enterprise or external user: KERBEROS
• SSL-authenticated enterprise or external user: SSL
• Radius-authenticated external user: RADIUS
• OS-authenticated external user or SYSDBA/SYSOPER: OS
• DCE-authenticated external user: DCE
• Proxy with certificate, DN, or username without using password: NONE

Job ID of the current session if it was established by an Oracle background process. Null if the session was not established by a background process.

Returns an identifier that is set by the application through the DBMS_SESSION.SET_IDENTIFIER procedure, the OCI attribute OCI_ATTR_CLIENT_IDENTIFIER, or the Java class Oracle.jdbc.OracleConnection.setClientIdentifier. This attribute is used by various database components to identify lightweight application users who authenticate as the same user.

SELECTsys_context('USERENV', 'CLIENT_IDENTIFIER') FROM dual;

exec dbms_session.set_identifier(USER || ' ' || SYSTIMESTAMP);

SELECTsys_context('USERENV', 'CLIENT_IDENTIFIER') FROM dual;

Returns user session information that can be stored by an application using the DBMS_APPLICATION_INFO package.

SELECTsys_context('USERENV', 'CLIENT_INFO') FROM dual;

exec dbms_application_info.set_client_info('TEST');

SELECTsys_context('USERENV', 'CLIENT_INFO') FROM dual;

The bind variables for fine-grained auditing

The name of the current edition

SELECTsys_context('USERENV', 'CURRENT_EDITION_ID') FROM dual;

The name of the current edition

SELECTsys_context('USERENV', 'CURRENT_EDITION_NAME') FROM dual;

Name of the default schema being used in the current schema. This value can be changed during the session with an ALTER SESSION SET CURRENT_SCHEMA statement.

SELECTsys_context('USERENV', 'CURRENT_SCHEMA') FROM dual;

Identifier of the default schema being used in the current session.

SELECTsys_context('USERENV', 'CURRENT_SCHEMAID') FROM dual;

SELECT user#
FROM sys.user$
WHERE name = USER;

Returns the first 4K bytes of the current SQL that triggered the fine-grained auditing event.

CURRENT_SQLnattributes return subsequent 4K-byte increments, where n can be an integer from 1 to 7, inclusive. CURRENT_SQL1 returns bytes 4K to 8K; CURRENT_SQL2 returns bytes 8K to 12K, and so forth. You can specify these attributes only inside the event handler for the fine-grained auditing feature.

The length of the current SQL statement that triggers fine-grained audit or row-level security (RLS) policy functions or event handlers. Valid only inside the function or event handler.

Domain of the database as specified in the DB_DOMAIN initialization parameter.

SELECTsys_context('USERENV', 'DB_DOMAIN') FROM dual;

Name of the database as specified in the DB_NAME initialization parameter.

SELECTsys_context('USERENV', 'DB_NAME') FROM dual;

SELECT name, value
FROM gv$parameter
where name LIKE 'db%name';

Name of the database as specified in the DB_UNIQUE_NAME initialization parameter.

SELECTsys_context('USERENV', 'DB_UNIQUE_NAME') FROM dual;

SELECT name, value
FROM gv$parameter
where name LIKE 'db%name';

The available auditing entry identifier. You cannot use this option in distributed SQL statements. To use this keyword in USERENV, the initialization parameter AUDIT_TRAIL must be set to true.

Returns the user's enterprise-wide identity:

• For enterprise users: the Oracle Internet Directory DN.
• For external users: the external identity (Kerberos principal name, Radius and DCE schema names, OS user name, Certificate DN).
• For local users and SYSDBA/SYSOPER logins: NULL.

The value of the attribute differs by proxy method:

• For a proxy with DN: the Oracle Internet Directory DN of the client
• For a proxy with certificate: the certificate DN of the client for external users; the Oracle Internet Directory DN for global users
• For a proxy with username: the Oracle Internet Directory DN if the client is an enterprise users; NULL if the client is a local database user.

Job ID of the current session if it was established by a client foreground process. Null if the session was not established by a foreground process.

The number used in the System Global Area by the globally accessed context.

SELECTsys_context('USERENV', 'GLOBAL_CONTEXT_MEMORY') FROM dual;

Returns the global user ID from Oracle Internet Directory for Enterprise User Security (EUS) logins; returns null for all other logins.

Name of the host machine from which the client has connected.

SELECTsys_context('USERENV', 'HOST') FROM dual;

Returns the way the user's schema was created in the database. Specifically, it reflects the IDENTIFIED clause in the CREATE/ALTER USER syntax. In the list that follows, the syntax used during schema creation is followed by the identification type returned:

• IDENTIFIED BY password: LOCAL
• IDENTIFIED EXTERNALLY: EXTERNAL
• IDENTIFIED GLOBALLY: GLOBAL SHARED
• IDENTIFIED GLOBALLY AS DN: GLOBAL PRIVATE

SELECTsys_context('USERENV', 'IDENTIFICATION_TYPE') FROM dual;

The instance identification number of the current instance.

SELECTsys_context('USERENV', 'INSTANCE') FROM dual;

The name of the instance.

SELECTsys_context('USERENV', 'INSTANCE_NAME') FROM dual;

IP address of the machine from which the client is connected.

TRUE if the session is SYS

SELECTsys_context('USERENV', 'ISDBA') FROM dual;

The ISO abbreviation for the language name, a shorter form. than the existing 'LANGUAGE' parameter.

SELECTsys_context('USERENV', 'LANG') FROM dual;

The language and territory currently used by your session, along with the database character set, in the form.:

language_territory.characterset.

SELECTsys_context('USERENV', 'LANGUAGE') FROM dual;

The application name (module) set through the DBMS_APPLICATION_INFO package or OCI.

SELECTsys_context('USERENV', 'MODULE') FROM dual;

Network protocol being used for communication, as specified in the 'PROTOCOL=protocol' portion of the connect string.

The current calendar of the current session.

SELECTsys_context('USERENV', 'NLS_CALENDAR') FROM dual;

The currency of the current session.

SELECTsys_context('USERENV', 'NLS_CURRENCY') FROM dual;

The date format for the session.

SELECTsys_context('USERENV', 'NLS_DATE_FORMAT') FROM dual;

The language used for expressing dates.

SELECTsys_context('USERENV', 'NLS_DATE_LANGUAGE') FROM dual;

BINARY or the linguistic sort basis.

SELECTsys_context('USERENV', 'NLS_SORT') FROM dual;

The territory of the current session.

SELECTsys_context('USERENV', 'NLS_TERRITORY') FROM dual;

Operating system username of the client process that initiated the database session.

SELECTsys_context('USERENV', 'OS_USER') FROM dual;

The invoker of row-level security (RLS) policy functions.

Returns the Oracle Internet Directory DN when the proxy user is an enterprise user.

Returns the global user ID from Oracle Internet Directory for Enterprise User Security (EUS) proxy users; returns NULL for all other proxy users.

Name of the database user who opened the current session on behalf of SESSION_USER.

Identifier of the database user who opened the current session on behalf of SESSION_USER.

The host name of the machine on which the instance is running.

SELECTsys_context('USERENV', 'SERVER_HOST') FROM dual;

The name of the service to which a given session is connected.

SELECTsys_context('USERENV', 'SERVICE_NAME') FROM dual;

Database user name by which the current user is authenticated. This value remains the same throughout the duration of the session.

SELECTsys_context('USERENV', 'SESSION_USER') FROM dual;

Identifier of the database user name by which the current user is authenticated.

SELECTsys_context('USERENV', 'SESSION_USERID') FROM dual;

The auditing session identifier. You cannot use this option in distributed SQL statements. This is the equivalent to the AUDSID column ingv$session.

SELECTsys_context('USERENV', 'SESSIONID') FROM dual;

The session number (different from the session ID).

SELECTsys_context('USERENV', 'SID') FROM dual;

The auditing statement identifier. STATEMENTID represents the number of SQL statements audited in a given session.

The operating system identifier for the client of the current session. In distributed SQL statements, this option returns the identifier for your local session. In a distributed environment, this is supported only for remote SELECT statements, not for remote INSERT, UPDATE, or DELETE operations. (The return length of this parameter may vary by operating system.)