SQL ordered by Reads(源码)

select *

from (select sqt.dskr,

sqt.exec,

decode(sqt.exec, 0, to_number(null), (sqt.dskr / sqt.exec)),

(100 * sqt.dskr) /

(SELECT sum(e.VALUE) - sum(b.value)

FROM DBA_HIST_SYSSTAT b, DBA_HIST_SYSSTAT e

WHERE B.SNAP_ID = &beg_snap

AND E.SNAP_ID = &end_snap

AND B.DBID = &DBID

AND E.DBID = &DBID

AND B.INSTANCE_NUMBER = &INST_NUM

AND E.INSTANCE_NUMBER = &INST_NUM

and e.STAT_NAME = 'physical reads'

and b.stat_name = 'physical reads') norm_val,

nvl((sqt.cput / 1000000), to_number(null)),

nvl((sqt.elap / 1000000), to_number(null)),

sqt.sql_id,

decode(sqt.module, null, null, 'Module: ' || sqt.module),

nvl(st.sql_text, to_clob('** SQL Text Not Available **'))

from (select sql_id,

max(module) module,

sum(disk_reads_delta) dskr,

sum(executions_delta) exec,

sum(cpu_time_delta) cput,

sum(elapsed_time_delta) elap

from dba_hist_sqlstat

where dbid = &dbid

and instance_number = &inst_num

and &beg_snap < snap_id

and snap_id <= &end_snap

group by sql_id) sqt,

dba_hist_sqltext st

where st.sql_id(+) = sqt.sql_id

and st.dbid(+) = &dbid

and (SELECT sum(e.VALUE) - sum(b.value)

FROM DBA_HIST_SYSSTAT b, DBA_HIST_SYSSTAT e

WHERE B.SNAP_ID = &beg_snap

AND E.SNAP_ID = &end_snap

AND B.DBID = &DBID

AND E.DBID = &DBID

AND B.INSTANCE_NUMBER = &INST_NUM

AND E.INSTANCE_NUMBER = &INST_NUM

and e.STAT_NAME = 'physical reads'

and b.stat_name = 'physical reads') > 0

order by nvl(sqt.dskr, -1) desc, sqt.sql_id)

where rownum < 65and(rownum <= 10

or norm_val > 1)

---------------------------------------------------实际应用的SQL--------------------------------------------------------

select *

from (select sqt.dskr "Physical Reads",

sqt.exec,

decode(sqt.exec, 0, to_number(null), (sqt.dskr / sqt.exec)) "Reads per Exec",

(100 * sqt.dskr) /

(SELECT sum(e.VALUE) - sum(b.value)

FROM DBA_HIST_SYSSTAT b, DBA_HIST_SYSSTAT e

WHERE B.SNAP_ID =

(select snap_id

from DBA_HIST_SNAPSHOT

where to_char(end_interval_time, 'yyyymmdd hh24') =

'20111121 08')

AND E.SNAP_ID =

(select snap_id

from DBA_HIST_SNAPSHOT

where to_char(end_interval_time, 'yyyymmdd hh24') =

'20111121 18')

AND B.DBID = 911569205

AND E.DBID = 911569205

AND B.INSTANCE_NUMBER = 1

AND E.INSTANCE_NUMBER = 1

and e.STAT_NAME = 'physical reads'

and b.stat_name = 'physical reads') "%Total",

nvl((sqt.cput / 1000000), to_number(null)) "CPU Time (s)",

nvl((sqt.elap / 1000000), to_number(null)) "Elapsed Time (s)",

sqt.sql_id,

decode(sqt.module, null, null, 'Module: ' || sqt.module) "SQL Module",

nvl(st.sql_text, to_clob('** SQL Text Not Available **')) "SQL Text"

from (select sql_id,

max(module) module,

sum(disk_reads_delta) dskr,

sum(executions_delta) exec,

sum(cpu_time_delta) cput,

sum(elapsed_time_delta) elap

from dba_hist_sqlstat

where dbid = 911569205

and instance_number = 1

and snap_id >

(select snap_id

from DBA_HIST_SNAPSHOT

where to_char(end_interval_time, 'yyyymmdd hh24') =

'20111121 08')

and snap_id <=

(select snap_id

from DBA_HIST_SNAPSHOT

where to_char(end_interval_time, 'yyyymmdd hh24') =

'20111121 18')

group by sql_id) sqt,

dba_hist_sqltext st

where st.sql_id(+) = sqt.sql_id

and st.dbid(+) = 911569205

and (SELECT sum(e.VALUE) - sum(b.value)

FROM DBA_HIST_SYSSTAT b, DBA_HIST_SYSSTAT e

WHERE B.SNAP_ID =

(select snap_id

from DBA_HIST_SNAPSHOT

where to_char(end_interval_time, 'yyyymmdd hh24') =

'20111121 08')

AND E.SNAP_ID =

(select snap_id

from DBA_HIST_SNAPSHOT

where to_char(end_interval_time, 'yyyymmdd hh24') =

'20111121 18')

AND B.DBID = 911569205

AND E.DBID = 911569205

AND B.INSTANCE_NUMBER = 1

AND E.INSTANCE_NUMBER = 1

and e.STAT_NAME = 'physical reads'

and b.stat_name = 'physical reads') > 0

order by nvl(sqt.dskr, -1) desc, sqt.sql_id)

where rownum < 65and(rownum <= 10

or "%Total" > 1)