全局临时表的统计信息是不能被收集的，如果被收集，它的统计信息肯定为0，会造成执行计划不准，所以要锁定它的统计信息，禁止系统自动收集。
--先解锁表的统计信息，然后删除表的统计信息，最后锁住表的统计信息
declare
v_sql
varchar2(500);
cursor rowList1 is
select‘begin dbms_stats.unlock_table_stats(user,‘‘‘ || table_name ||
‘‘‘); end;‘
from user_tables s
where s.temporary =
‘Y‘;
cursor rowList2 is
select‘begin dbms_stats.delete_table_stats(user,‘‘‘ || table_name ||
‘‘‘); end;‘
from user_tables s
where s.temporary =
‘Y‘;
cursor rowList3 is
select‘begin dbms_stats.lock_table_stats(user,‘‘‘ || table_name ||
‘‘‘); end;‘
from user_tables s
where s.temporary =
‘Y‘;
begin
open rowList1;
open rowList2;
open rowList3;
loop
fetch rowList1 into v_sql;
executeimmediate v_sql;
exitwhen rowList1%notfound;
endloop;
loop
fetch rowList2 into v_sql;
executeimmediate v_sql;
exitwhen rowList2%notfound;
endloop;
loop
fetch rowList3 into v_sql;
executeimmediate v_sql;
exitwhen rowList3%notfound;
endloop;
close rowList1;
close rowList2;
close rowList3;
end;
-- STATTYPE_LOCKED=‘ALL‘意思是表的统计信息被锁
select s.table_name,s.STATTYPE_LOCKEDfrom user_TAB_STATISTICS s where
s.STATTYPE_LOCKED=‘ALL‘;