column sql_text format a80; -- 值得怀疑的SQL 来自http://www.ixora.com.au/ select substr(to_char(s.pct, ''''99.00''''), 2) || ''''%'''' load, s.executions executes, p.sql_text from ( select address, disk_reads, executions, pct, rank() over (order by disk_reads desc) ranking from ( select address, disk_reads, executions, 100 * ratio_to_report(disk_reads) over () pct from sys.v_$sql where command_type != 47 ) where disk_reads > 50 * executions ) s, sys.v_$sqltext p where s.ranking <= 5 and p.address = s.address order by 1, s.address, p.piece /
-- 逻辑读多的SQL select * from (select buffer_gets, sql_text from v$sqlarea where buffer_gets > 500000 order by buffer_gets desc) where rownum<=30;
-- 执行次数多的SQL select sql_text,executions from (select sql_text,executions from v$sqlarea order by executions desc) where rownum<81;
-- 读硬盘多的SQL select sql_text,disk_reads from (select sql_text,disk_reads from v$sqlarea order by disk_reads desc) where rownum<21;
-- 排序多的SQL select sql_text,sorts from (select sql_text,sorts from v$sqlarea order by sorts desc) where rownum<21;
--分析的次数太多，执行的次数太少，要用绑变量的方法来写sql set pagesize 600; set linesize 120; select substr(sql_text,1,80) "sql", count(*), sum(executions) "totexecs" from v$sqlarea where executions < 5 group by substr(sql_text,1,80) having count(*) > 30 order by 2;
-- 游标的观察 set pages 300; select sum(a.value), b.name from v$sesstat a, v$statname b where a.statistic# = b.statistic# and b.name = ''''opened cursors current'''' group by b.name;
select count(0) from v$open_cursor;
select user_name,sql_text,count(0) from v$open_cursor group by user_name,sql_text having count(0)>30;
--查看当前用户&username执行的SQL select sql_text from v$sqltext_with_newlines where (hash_value,address) in (select sql_hash_value,sql_address from v$session where username=''''&username'''') order by address,piece;
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