--每分钟操作
SQL> select sql_id, mi, count(mi)
2 from (select event, sql_id, to_char(sample_time, 'yyyymmdd hh24mi') mi --,
3 --session_id
4 from dba_hist_active_sess_history
5 where sql_id = '7wxfw53bsmgpq'
6 and sample_time > to_date('20140717 0940', 'yyyymmdd hh24mi')
7 and sample_time < to_date('20140717 0950', 'yyyymmdd hh24mi'))
8 group by sql_id, mi
9 order by mi ;
SQL_ID MI COUNT(MI)
------------- ------------- ----------
7wxfw53bsmgpq 20140717 0942 1
7wxfw53bsmgpq 20140717 0943 23
7wxfw53bsmgpq 20140717 0944 125
7wxfw53bsmgpq 20140717 0946 96
7wxfw53bsmgpq 20140717 0947 114
7wxfw53bsmgpq 20140717 0949 44
通过图片，发现对 第一条获取序列的语句比較暂用性能
--等待事件以及语句情况
SQL> select event,sql_id, mi, count(mi)
2 from (select substrb(event,1.30) event, sql_id, to_char(sample_time, 'yyyymmdd hh24mi') mi --,
3 --session_id
4 from dba_hist_active_sess_history
5 where sql_id = '7wxfw53bsmgpq'
6 and sample_time > to_date('20140717 0940', 'yyyymmdd hh24mi')
7 and sample_time < to_date('20140717 0950', 'yyyymmdd hh24mi'))
8 group by event,sql_id, mi
9 order by mi ;
EVENT SQL_ID MI COUNT(MI)
---------------------------------------------------------------- ------------- ------------- ----------
7wxfw53bsmgpq 20140717 0942 1
buffer busy waits 7wxfw53bsmgpq 20140717 0943 1
enq: SQ - contention 7wxfw53bsmgpq 20140717 0943 22
buffer busy waits 7wxfw53bsmgpq 20140717 0944 3
enq: SQ - contention 7wxfw53bsmgpq 20140717 0944 122
buffer busy waits 7wxfw53bsmgpq 20140717 0946 2
enq: SQ - contention 7wxfw53bsmgpq 20140717 0946 94
buffer busy waits 7wxfw53bsmgpq 20140717 0947 2
enq: SQ - contention 7wxfw53bsmgpq 20140717 0947 112
buffer busy waits 7wxfw53bsmgpq 20140717 0949 1
enq: SQ - contention 7wxfw53bsmgpq 20140717 0949 43
--大小获取查询
SQL> select sequence_name,cache_size from dba_sequences where sequence_name like upper('%qreque%');
SEQUENCE_NAME CACHE_SIZE
------------------------------ ----------
QREQUESTNO 20 改成100 在測试
SQL>
--大小获取查询
SQL> select sequence_name,cache_size from dba_sequences where sequence_name like upper('%qreque%');
SEQUENCE_NAME CACHE_SIZE
------------------------------ ----------
QREQUESTNO 20 变100 在测试
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