- 最耗内存的10个sql（SGA）
set line 130
col sql_text for a100
col pct for 999
SELECT position,percent,sql_id,round(buffer_gets/1024/1024,2) mb,sql_text FROM
(
SELECT a.*,rank() over ( ORDER BY buffer_gets DESC) position, round(100 * ratio_to_report(buffer_gets) over()) Percent
FROM v$sqlarea a
WHERE command_type = 3
)
WHERE position< 11;
- 使用资源最多的SQL语句：
（较高的磁盘读取（disk_reads消耗I/O）和较高的逻辑读取（buffer_gets消耗CPU）被用作衡量标准）
select sql_text from
(select sql_text,executions,buffer_gets,disk_reads
from v$sql
where buffer_gets > 100000
or disk_reads > 100000
order by buffer_gets + 100*disk_reads DESC)
where rownum <= 5;
- 使用CPU最多的SQL语句：
（较高的逻辑读取（buffer_gets消耗CPU）被用作衡量标准）
select sql_text from
(select sql_text,executions,buffer_gets,disk_reads
from v$sql
where buffer_gets > 100000
order by buffer_gets desc)
where rownum <= 5;
或者
（直接使用v$sql里的cpu_time）
select sql_text,
round(cpu_time/1000000, 2) cpu_seconds from
(select * from v$sql order by cpu_time desc)
where rownum <= 5;
- 使用磁盘I/O最多的SQL语句：
（较高的磁盘读取（disk_reads消耗I/O）被用作衡量标准）
select sql_text from
(select sql_text,executions,buffer_gets,disk_reads
from v$sql
where disk_reads > 100000
order by disk_reads desc)
where rownum <= 5;
- 占用数据库时间最多的SQL语句：
select sql_text,round(elapsed_time/1000000, 2) elapsed_seconds,executions from
(select * from v$sql order by elapsed_time desc)
where rownum <= 5;
- 执行次数最多的SQL语句：
select sql_text, executions from
(select * from v$sql
where executions > 1000
order by executions desc)
where rownum <= 5;
- 解析调用最多的SQL语句：
select sql_text,parse_calls from
(select * from v$sql
where parse_calls > 1000
order by parse_calls desc)
where rownum <= 5;
- 使用共享内存最多的SQL语句：
（使用共享内存大于1048576（bytes）的SQL语句会显示）
select sql_text,sharable_mem from
(select * from v$sql
where sharable_mem > 1048576
order by sharable_mem desc)
where rownum <= 5;
- 排序多的SQL
SELECT sql_text, sorts
FROM (SELECT sql_text, sorts
FROM v$sqlarea
ORDER BY sorts DESC)
WHERE ROWNUM < 21;
- Parse Calls
set linesize 100 set pagesize 100 SELECT * FROM
(SELECT substr(sql_text,1,40) sql,
parse_calls, executions, hash_value,address FROM V$SQLAREA WHERE parse_calls > 1000 ORDER BY parse_calls DESC) WHERE rownum <= 10 ;
- version_count
set linesize 100 set pagesize 100 SELECT * FROM
(SELECT substr(sql_text,1,40) sql,
version_count, executions, hash_value,address FROM V$SQLAREA WHERE version_count > 20 ORDER BY version_count DESC) WHERE rownum <= 10 ;