Oracle SQL FGA系统上下文（‘；userenv’；，’；当前SQL’；）被截断

我想使用FGA和sys_context（'userenv'，'current_sql'）记录一个特定表中的所有语句，我可以接近我需要的内容，但看起来current_sql总是被截断为256个字符

我试图查看当前的_sql1到7，但它们总是空的。下面是我用来设置此设置的代码：

create table emp_audit
( whodidit varchar2(40)
, whenwasit timestamp
, sql_executed varchar2(4000)
, sql_executed1 varchar2(4000)
, sql_executed2 varchar2(4000)
, sql_executed3 varchar2(4000)
, sql_executed4 varchar2(4000)
, sql_executed5 varchar2(4000)
, sql_executed6 varchar2(4000)
, sql_executed7 varchar2(4000)
);

create or replace
package AUDIT_HANDLER
is
PROCEDURE HANDLE_EMP_SAL_ACCESS
( object_schema VARCHAR2
, object_name VARCHAR2
, policy_name VARCHAR2
);
end;

create or replace
package body AUDIT_HANDLER
is
PROCEDURE HANDLE_EMP_SAL_ACCESS
( object_schema VARCHAR2
, object_name VARCHAR2
, policy_name VARCHAR2
) is
  PRAGMA AUTONOMOUS_TRANSACTION;
begin
  insert into emp_audit
  ( whodidit, whenwasit, sql_executed, SQL_EXECUTED1, SQL_EXECUTED2, SQL_EXECUTED3, SQL_EXECUTED4, SQL_EXECUTED5, SQL_EXECUTED6, SQL_EXECUTED7)
  values
  ( user, systimestamp, sys_context('userenv','current_sql'),sys_context('userenv','current_sql1'),sys_context('userenv','current_sql2'),sys_context('userenv','current_sql3'),sys_context('userenv','current_sql4'),sys_context('userenv','current_sql5'),sys_context('userenv','current_sql6'),sys_context('userenv','current_sql7'))
  ;
  commit;
end HANDLE_EMP_SAL_ACCESS;
end;


begin
  dbms_fga.add_policy
  ( object_schema=>'EPAT'
  , object_name=>'PERSON'
  , policy_name=>'PHI_ACCESS_HANDLED'
  , handler_schema => 'SBOUCHAR'
  , handler_module => 'AUDIT_HANDLER.HANDLE_EMP_SAL_ACCESS'
  );
end;

---

似乎您必须在调用sys_上下文时指定长度：

sys_context('userenv','current_sql',4000)