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参考技术A 应该是你使用过譬如excelcutter软件之类产生的注册表计数的项。没有其他作用。sys_context （） 这个函数 是做啥用的，举个例子。v$session里的audsid 是干啥用的。
可以通过SYS_CONTEXT获取用户连接的一些信息SYS_CONTEXT("USERENV","TERMINAL") terminal,
SYS_CONTEXT("USERENV","LANGUAGE") language,
SYS_CONTEXT("USERENV","SESSIONID") sessionid,
SYS_CONTEXT("USERENV","INSTANCE") instance,
SYS_CONTEXT("USERENV","ENTRYID") entryid,
SYS_CONTEXT("USERENV","ISDBA") isdba,
SYS_CONTEXT("USERENV","NLS_TERRITORY") nls_territory,
SYS_CONTEXT("USERENV","NLS_CURRENCY") nls_currency,
SYS_CONTEXT("USERENV","NLS_CALENDAR") nls_calendar,
SYS_CONTEXT("USERENV","NLS_DATE_formAT") nls_date_format,
SYS_CONTEXT("USERENV","NLS_DATE_LANGUAGE") nls_date_language,
SYS_CONTEXT("USERENV","NLS_SORT") nls_sort,
SYS_CONTEXT("USERENV","CURRENT_USER") current_user,
SYS_CONTEXT("USERENV","CURRENT_USERID") current_userid,
SYS_CONTEXT("USERENV","SESSION_USER") session_user,
SYS_CONTEXT("USERENV","SESSION_USERID") session_userid,
SYS_CONTEXT("USERENV","PROXY_USER") proxy_user,
SYS_CONTEXT("USERENV","PROXY_USERID") proxy_userid,
SYS_CONTEXT("USERENV","DB_DOMAIN") db_domain,
SYS_CONTEXT("USERENV","DB_NAME") db_name,
SYS_CONTEXT("USERENV","HOST") host,
SYS_CONTEXT("USERENV","OS_USER") os_user,
SYS_CONTEXT("USERENV","EXTERNAL_NAME") external_name,
SYS_CONTEXT("USERENV","IP_ADDRESS") ip_address,
SYS_CONTEXT("USERENV","NETWORK_PROTOCOL") network_protocol,
SYS_CONTEXT("USERENV","BG_JOB_ID") bg_job_id,
SYS_CONTEXT("USERENV","FG_JOB_ID") fg_job_id,
SYS_CONTEXT("USERENV","AUTHENTICATION_TYPE") authentication_type,
SYS_CONTEXT("USERENV","AUTHENTICATION_DATA") authentication_data
v$session用于寻找用户SID或SADDR 参考技术A 返回用户信息
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