标签:style ar color os sp on bs ef tt
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‘;
标签:style ar color os sp on bs ef tt
原文地址:http://blog.csdn.net/stevendbaguo/article/details/41314423