使用dbms_lob.freetemporary释放lob 临时表空间
declare
clb clob;ch varchar2(32767);
k number;
begin
dbms_lob.createtemporary(clb,true,dbms_lob.call);
for i in 1..1500 loop
ch:=lpad('o',32767,'Y');
dbms_lob.writeappend(clb,length(ch),ch);
end loop;
k:=dbms_lob.getlength(clb);
dbms_lob.freetemporary(clb);
dbms_output.put_line('the clob length: '||k);
end;
/
当然，也可以这样：
alter session set events '60025 trace name context forever'
logon触发器来实现该功能。
create or replace trigger sys.login_db after logon on database
begin
execute immediate 'alter session set events ''60025 trace name context forever''';
end;