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Oracle SYS_CONTEXT Function

原创 Oracle 作者:qiuyb 时间:2006-03-30 13:52:55 0 删除 编辑

Oracle SYS_CONTEXT Function

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Actions As SYS
Note: USERENV is an Oracle provided namespace that describes the current session.
UsageSELECT sys_context('', '', );
FROM dual;
SELECT sys_context('USERENV', 'OS_USER') FROM dual;
Attribute Return Value
ACTIONIdentifies the position in the module (application name) and is set through the DBMS_APPLICATION_INFO package or OCI.
AUDITED_CURSORIDReturns 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.
AUTHENTICATED_IDENTITYReturns 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
AUTHENTICATION_DATAData 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.
AUTHENTICATION_METHODReturns 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
BG_JOB_IDJob 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.
CLIENT_IDENTIFIERReturns 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.
CLIENT_INFOReturns user session information that can be stored by an application using the DBMS_APPLICATION_INFO package.
CURRENT_BINDThe bind variables for fine-grained auditing.
CURRENT_SCHEMAName 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.
CURRENT_SCHEMAIDIdentifier of the default schema being used in the current session.
CURRENT_SQLReturns the first 4K bytes of the current SQL that triggered the fine-grained auditing event.
CURRENT_SQLnCURRENT_SQLn attributes 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.
CURRENT_SQL_LENGTHThe 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.
DB_DOMAINDomain of the database as specified in the DB_DOMAIN initialization parameter.
DB_NAMEName of the database as specified in the DB_NAME initialization parameter.
SELECT name, value
FROM v$parameter
where name like 'db%name';
DB_UNIQUE NAMEName of the database as specified in the DB_UNIQUE_NAME initialization parameter.
SELECT name, value
FROM v$parameter
where name like 'db%name';
ENTRYIDThe 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.
ENTERPRISE_IDENTITYReturns 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.
FG_JOB_IDJob 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.
GLOBAL_CONTEXT_MEMORYThe number used in the System Global Area by the globally accessed context.
GLOBAL_UIDReturns the global user ID from Oracle Internet Directory for Enterprise User Security (EUS) logins; returns null for all other logins.
HOSTName of the host machine from which the client has connected.
IDENTIFICATION_TYPEReturns 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
INSTANCEThe instance identification number of the current instance.
INSTANCE_NAMEThe name of the instance.
IP_ADDRESSIP address of the machine from which the client is connected.
ISDBATRUE if you are logged on as SYS.
LANGThe ISO abbreviation for the language name, a shorter form than the existing 'LANGUAGE' parameter.
LANGUAGEThe language and territory currently used by your session, along with the database character set, in the form:

language_territory.characterset.
MODULEThe application name (module) set through the DBMS_APPLICATION_INFO package or OCI.
NETWORK_PROTOCOLNetwork protocol being used for communication, as specified in the 'PROTOCOL=protocol' portion of the connect string.
NLS_CALENDARThe current calendar of the current session.
NLS_CURRENCYThe currency of the current session.
NLS_DATE_FORMATThe date format for the session.
NLS_DATE_LANGUAGEThe language used for expressing dates.
NLS_SORTBINARY or the linguistic sort basis.
NLS_TERRITORYThe territory of the current session.
OS_USEROperating system username of the client process that initiated the database session.
POLICY_INVOKERThe invoker of row-level security (RLS) policy functions.
PROXY_ENTERPRISE_IDENTITYReturns the Oracle Internet Directory DN when the proxy user is an enterprise user.
PROXY_GLOBAL_UIDReturns the global user ID from Oracle Internet Directory for Enterprise User Security (EUS) proxy users; returns NULL for all other proxy users.
PROXY_USERName of the database user who opened the current session on behalf of SESSION_USER.
PROXY_USERIDIdentifier of the database user who opened the current session on behalf of SESSION_USER.
SERVER_HOSTThe host name of the machine on which the instance is running.
SERVICE_NAMEThe name of the service to which a given session is connected.
SESSION_USERDatabase user name by which the current user is authenticated. This value remains the same throughout the duration of the session.
SESSION_USERIDIdentifier of the database user name by which the current user is authenticated.
SESSIONIDThe auditing session identifier. You cannot use this option in distributed SQL statements.
SIDThe session number (different from the session ID).
STATEMENTIDThe auditing statement identifier. STATEMENTID represents the number of SQL statements audited in a given session.
TERMINALThe 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.)

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