oracle统计信息导致卡,oracle 自动收集统计信息造成业务卡顿
统计等待事件：
BLOCKING_SESSION COUNT(*)
---------------- ----------
243 1
9695 1
8368 1
1323 1
1345 91
9257 3626
221 1
4417 2
4185 1
8815 4
1128 2
查询9257阻塞：
SESSION_ID SAMPLE_TIME
---------- ----------------------------------------
EVENT SQL_ID BLOCKING_SESSION
------------------------------ ------------- ----------------
9257 27-JUN-20 02.00.44.546 PM
gc current block 2-way xxxxx
9257 27-JUN-20 02.00.54.586 PM
row cache lock xxxxxx 1345
9257 27-JUN-20 02.01.04.626 PM
row cache lock xxxxxx 1345
SESSION_ID SAMPLE_TIME
---------- ----------------------------------------
EVENT SQL_ID BLOCKING_SESSION
------------------------------ ------------- ----------------
9257 27-JUN-20 02.01.14.817 PM
row cache lock xxxxxx 1345
9257 27-JUN-20 02.01.24.867 PM
row cache lock xxxxx 1345
9257 27-JUN-20 02.01.34.907 PM
row cache lock xxxxxx 1345
SESSION_ID SAMPLE_TIME
---------- ----------------------------------------
EVENT SQL_ID BLOCKING_SESSION
------------------------------ ------------- ----------------
9257 27-JUN-20 02.01.44.957 PM
row cache lock xxxxxx 1345
9257 27-JUN-20 02.01.55.007 PM
row cache lock xxxxxxx 1345
9257 27-JUN-20 02.02.05.047 PM
row cache lock xxxxx 1345
查询1345阻塞：
SESSION_ID SAMPLE_TIME
---------- ----------------------------------------
EVENT SQL_ID BLOCKING_SESSION
------------------------------ ------------- ----------------
1345 27-JUN-20 02.00.34.496 PM
xxxxxx
1345 27-JUN-20 02.00.54.586 PM
library cache lock xxxxxx 9257
1345 27-JUN-20 02.01.04.626 PM
library cache lock xxxxx 9257
9257执行sql：call dbms_stats.gather_database_stats_job_proc ( )
1345执行sql：alter index “name”.“biao” modify partition “PPP” shrink space CHECK
我想查询一下alter index这个sql是由谁执行的。是收集统计信息的时候自动执行，还是其他？如何操作？