问题是这样的：
1 sql> r
2 1 select count(*)
3 2 from t_edu_member_info
4 3* where status='1' and xs_zy='1'
01 执行计划
02 -------------------------------------------------------------------------------------------
03 0 SELECT STATEMENT Optimizer=ALL_ROWS (Cost=1 Card=1 Bytes=10)
04 1 0 SORT (AGGREGATE)
05 2 1 FILTER
06 3 2 INDEX (RANGE SCAN) OF 'IND_T_PREBM4' (NON-UNIQUE) (Cost=1 Card=5 Bytes=50)
07
08 统计信息
09 ----------------------------------------------------------
10 25 recursive calls
11 14 db block gets
12 3 consistent gets
13 1 physical reads
14 972 redo size
15 375 bytes sent via SQL*Net to client
16 372 bytes received via SQL*Net from client
17 2 SQL*Net roundtrips to/from client
18 1 sorts (memory)
19 0 sorts (disk)
20 1 rows processed
这个结果已经跑了几次，但是 recursive calls 依然存在，后来从10046事件产生的trace文件中到了线索。用tkprof格式化trace文件后，可以看到：
1 select count(*)
2 from t_edu_member_info
3 where status='1'
4 and xs_zy='1'
01 call count cpu elapsed disk query current rows
02 ------- ------ -------- ---------- ---------- ---------- ---------- ----------
03 Parse 1 0.01 0.00 0 0 0 0
04 Execute 1 0.78 0.90 0 0 12 0
05 Fetch 2 0.00 0.00 0 1 0 1
06 ------- ------ -------- ---------- ---------- ---------- ---------- ----------
07 total 4 0.79 0.90 0 1 12 1
08
09 Misses in library cache during parse: 1
10 Optimizer mode: ALL_ROWS
11 Parsing user id: 64
12
13 Rows Row Source Operation
14 ------- ---------------------------------------------------
15 1 SORT AGGREGATE
16 0 FILTER
17 0 INDEX RANGE SCAN IND_T_PREBM4 (object id 38674)
18
19 Elapsed times include waiting on following events:
20 Event waited on Times Max. Wait Total Waited
21 ---------------------------------------- Waited ---------- ------------
22 direct path write 1 0.00 0.00
23 SQL*Net message to client 2 0.00 0.00
24 SQL*Net message from client 2 27.20 27.22
1 insert into sys.fga_log$(sessionid,timestamp#,dbuid,osuid,obj$schema,obj$name,
2 policyname,scn,plhol,sqlbind,oshst,clientid,extid,lsqltext)
3 values
4 (:1,sysdate,:2,:3,:4,:5,:6,:7,:8,:9,:10,:11,:12,:13)
01 call count cpu elapsed disk query current rows
02 ------- ------ -------- ---------- ---------- ---------- ---------- ----------
03 Parse 1 0.00 0.00 0 0 0 0
04 Execute 1 2.09 2.94 1 2 2 1
05 Fetch 0 0.00 0.00 0 0 0 0
06 ------- ------ -------- ---------- ---------- ---------- ---------- ----------
07 total 2 2.09 2.94 1 2 2 1
08
09 Misses in library cache during parse: 1
10 Optimizer mode: CHOOSE
11 Parsing user id: SYS (recursive depth: 1)
12
13 Elapsed times include waiting on following events:
14 Event waited on Times Max. Wait Total Waited
15 ---------------------------------------- Waited ---------- ------------
16 direct path read (lob) 1 0.00 0.00
原来是打开了审计功能