Oracle如何查看历史TOP SQL

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Oracle 查看历史TOP SQL

历史TOP SQL可以通过AWR直接查看，
但是有时AWR信息显示不全，默认只显示TOP 10，
可以通过dba_hist_sqltext，dba_hist_sqlstat等查看更详细的信息；

---查看快照信息
---选择2018-06-14全天的快照6504-6528；
---conn chenjch/chenjch
select SNAP_ID,
DBID,
to_char(BEGIN_INTERVAL_TIME, 'yyyy-mm-dd hh34:mi:ss'),
to_char(END_INTERVAL_TIME, 'yyyy-mm-dd hh34:mi:ss'),
FLUSH_ELAPSED,
SNAP_LEVEL
from dba_hist_snapshot order by 1;

---1 查看2018-06-14全天SQL ordered by Elapsed Time
---时间单位默认microseconds
select a.sql_id,
a.module,
a.elap,
a.exec,
decode(a.exec, 0, to_number(null), (a.elap / a.exec)) elap_one,
b.sql_text
from dba_hist_sqltext b,
(select sql_id,
max(module) module,
sum(elapsed_time_delta) / 1000000 elap,
sum(executions_delta) exec
from dba_hist_sqlstat
where dbid = 1000919065
and instance_number = 1
and 6504 < snap_id
and snap_id <= 6528
group by sql_id) a
where a.sql_id = b.sql_id
order by elap desc;

---2 查看2018-06-14全天SQL ordered by Gets
---时间单位默认microseconds
select a.sql_id,
a.module,
a.bget,
decode(a.exec, 0, to_number(null), a.bget / a.exec) get_per_exec,
a.exec,
(a.cput/1000000)/elap*100 CPU,
a.elap,
b.sql_text
from dba_hist_sqltext b,
(select sql_id,
max(module) module,
sum(buffer_gets_delta) bget,
sum(executions_delta) exec,
sum(cpu_time_delta) cput,
sum(elapsed_time_delta) / 1000000 elap
from dba_hist_sqlstat
where dbid = 1000919065
and instance_number = 1
and 6504 < snap_id
and snap_id <= 6528
group by sql_id) a
where a.sql_id = b.sql_id
order by bget desc;

---3 查看2018-06-14全天SQL ordered by Reads
---时间单位默认microseconds
select a.sql_id,
a.module,
a.diskread,
a.exec,
decode(a.exec, 0, to_number(null), a.diskread / a.exec) diskread_one,
(a.cput/1000000)/elap*100 CPU,
a.elap,
b.sql_text
from dba_hist_sqltext b,
(select sql_id,
max(module) module,
sum(disk_reads_delta) diskread,
sum(executions_delta) exec,
sum(cpu_time_delta) cput,
sum(elapsed_time_delta) / 1000000 elap
from dba_hist_sqlstat
where dbid = 1000919065
and instance_number = 1
and 6504 < snap_id
and snap_id <= 6528
group by sql_id) a
where a.sql_id = b.sql_id
order by diskread desc;

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