Información sobre gestor Oracle

Hola compañeros de la shell,

A veces necesitamos obtener información sobre el gestor Oracle al que estamos conectados y, por desgracia, no tenemos acceso al usuario dba. Revisando una incidencia, nos topamos con esta query del usuario beloblotskiy buscando stackoverflow (https://stackoverflow.com/questions/8114453/read-all-parameters-from-sys-context-userenv).

   select res.*
    from (
      select *
      from (
        select
          sys_context ('userenv','ACTION') ACTION,
          sys_context ('userenv','AUDITED_CURSORID') AUDITED_CURSORID,
          sys_context ('userenv','AUTHENTICATED_IDENTITY') AUTHENTICATED_IDENTITY,
          sys_context ('userenv','AUTHENTICATION_DATA') AUTHENTICATION_DATA,
          sys_context ('userenv','AUTHENTICATION_METHOD') AUTHENTICATION_METHOD,
          sys_context ('userenv','BG_JOB_ID') BG_JOB_ID,
          sys_context ('userenv','CLIENT_IDENTIFIER') CLIENT_IDENTIFIER,
          sys_context ('userenv','CLIENT_INFO') CLIENT_INFO,
          sys_context ('userenv','CURRENT_BIND') CURRENT_BIND,
          sys_context ('userenv','CURRENT_EDITION_ID') CURRENT_EDITION_ID,
          sys_context ('userenv','CURRENT_EDITION_NAME') CURRENT_EDITION_NAME,
          sys_context ('userenv','CURRENT_SCHEMA') CURRENT_SCHEMA,
          sys_context ('userenv','CURRENT_SCHEMAID') CURRENT_SCHEMAID,
          sys_context ('userenv','CURRENT_SQL') CURRENT_SQL,
          sys_context ('userenv','CURRENT_SQLn') CURRENT_SQLn,
          sys_context ('userenv','CURRENT_SQL_LENGTH') CURRENT_SQL_LENGTH,
          sys_context ('userenv','CURRENT_USER') CURRENT_USER,
          sys_context ('userenv','CURRENT_USERID') CURRENT_USERID,
          sys_context ('userenv','DATABASE_ROLE') DATABASE_ROLE,
          sys_context ('userenv','DB_DOMAIN') DB_DOMAIN,
          sys_context ('userenv','DB_NAME') DB_NAME,
          sys_context ('userenv','DB_UNIQUE_NAME') DB_UNIQUE_NAME,
          sys_context ('userenv','DBLINK_INFO') DBLINK_INFO,
          sys_context ('userenv','ENTRYID') ENTRYID,
          sys_context ('userenv','ENTERPRISE_IDENTITY') ENTERPRISE_IDENTITY,
          sys_context ('userenv','FG_JOB_ID') FG_JOB_ID,
          sys_context ('userenv','GLOBAL_CONTEXT_MEMORY') GLOBAL_CONTEXT_MEMORY,
          sys_context ('userenv','GLOBAL_UID') GLOBAL_UID,
          sys_context ('userenv','HOST') HOST,
          sys_context ('userenv','IDENTIFICATION_TYPE') IDENTIFICATION_TYPE,
          sys_context ('userenv','INSTANCE') INSTANCE,
          sys_context ('userenv','INSTANCE_NAME') INSTANCE_NAME,
          sys_context ('userenv','IP_ADDRESS') IP_ADDRESS,
          sys_context ('userenv','ISDBA') ISDBA,
          sys_context ('userenv','LANG') LANG,
          sys_context ('userenv','LANGUAGE') LANGUAGE,
          sys_context ('userenv','MODULE') MODULE,
          sys_context ('userenv','NETWORK_PROTOCOL') NETWORK_PROTOCOL,
          sys_context ('userenv','NLS_CALENDAR') NLS_CALENDAR,
          sys_context ('userenv','NLS_CURRENCY') NLS_CURRENCY,
          sys_context ('userenv','NLS_DATE_FORMAT') NLS_DATE_FORMAT,
          sys_context ('userenv','NLS_DATE_LANGUAGE') NLS_DATE_LANGUAGE,
          sys_context ('userenv','NLS_SORT') NLS_SORT,
          sys_context ('userenv','NLS_TERRITORY') NLS_TERRITORY,
          sys_context ('userenv','OS_USER') OS_USER,
          sys_context ('userenv','POLICY_INVOKER') POLICY_INVOKER,
          sys_context ('userenv','PROXY_ENTERPRISE_IDENTITY') PROXY_ENTERPRISE_IDENTITY,
          sys_context ('userenv','PROXY_USER') PROXY_USER,
          sys_context ('userenv','PROXY_USERID') PROXY_USERID,
          sys_context ('userenv','SERVER_HOST') SERVER_HOST,
          sys_context ('userenv','SERVICE_NAME') SERVICE_NAME,
          sys_context ('userenv','SESSION_EDITION_ID') SESSION_EDITION_ID,
          sys_context ('userenv','SESSION_EDITION_NAME') SESSION_EDITION_NAME,
          sys_context ('userenv','SESSION_USER') SESSION_USER,
          sys_context ('userenv','SESSION_USERID') SESSION_USERID,
          sys_context ('userenv','SESSIONID') SESSIONID,
          sys_context ('userenv','SID') SID,
          sys_context ('userenv','STATEMENTID') STATEMENTID,
          sys_context ('userenv','TERMINAL') TERMINAL
        from dual
        -- where sys_context ('userenv','SESSIONID') NOT in ('SYS', 'XDB')    -- <<<<< filter by user
      )
      unpivot include nulls (
        val for name in (action, audited_cursorid, authenticated_identity, authentication_data, authentication_method, bg_job_id, client_identifier, client_info, current_bind, current_edition_id, current_edition_name, current_schema, current_schemaid, current_sql, current_sqln, current_sql_length, current_user, current_userid, database_role, db_domain, db_name, db_unique_name, dblink_info, entryid, enterprise_identity, fg_job_id, global_context_memory, global_uid, host, identification_type, instance, instance_name, ip_address, isdba, lang, language, module, network_protocol, nls_calendar, nls_currency, nls_date_format, nls_date_language, nls_sort, nls_territory, os_user, policy_invoker, proxy_enterprise_identity, proxy_user, proxy_userid, server_host, service_name, session_edition_id, session_edition_name, session_user, session_userid, sessionid, sid, statementid, terminal)
      )
    ) res;

Si quisiéramos obtener solamente un valor, por ejemplo el nombre de host, podemos ejecutar:

-- Ver host 

select res.*
from (
  select *
  from (
    select
      sys_context('userenv', 'SERVER_HOST') SERVER_HOST
    from dual
  )
  unpivot include nulls (
    val for name in (server_host)
  )
) res;

Espero que os sirva.

Nos vemos al otro lado de la pantalla negra.