How to avoid the problem of blocking
Hi allI use Oracle 9.2.0.4 on RHEL4. This time when the user seeks to insert data in a module of paricular registration in a single row, it takes more than an hour.
SQL> select EVENT,TOTAL_WAITS,TIME_WAITED,AVERAGE_WAIT from v$sessIOn_event wher
e sid=339;
EVENT TOTAL_WAITS TIME_WAITED AVERAGE_WAIT
-------------------- ----------- ----------- ------------
enqueue 1156 346494 300
db file sequential r 4 0 0
ead
SQL*Net message to c 383 0 0
lient
SQL*Net more data to 38 0 0
client
SQL*Net message from 383 6136 16
EVENT TOTAL_WAITS TIME_WAITED AVERAGE_WAIT
-------------------- ----------- ----------- ------------
client
SQL> select l1.sid, ' IS BLOCKING ', l2.sid from v$lock l1, v$lock l2
where l1.block =1 and l2.request > 0
and l1.id1=l2.id1
and l1.id2=l2.id2;
SID 'ISBLOCKING' SID
---------- ------------- ----------
111 IS BLOCKING 181
178 IS BLOCKING 53
178 IS BLOCKING 69
178 IS BLOCKING 71
178 IS BLOCKING 80
178 IS BLOCKING 154
178 IS BLOCKING 173
178 IS BLOCKING 191
178 IS BLOCKING 230
178 IS BLOCKING 252
178 IS BLOCKING 255
SID 'ISBLOCKING' SID
---------- ------------- ----------
178 IS BLOCKING 259
178 IS BLOCKING 290
178 IS BLOCKING 339
178 IS BLOCKING 399
15 rows selected.
SQL> select PCT_FREE,PCT_USED,INI_TRANS,MAX_TRANS from dba_tables where TABLE_NA
ME='OS_STU_COURSE';
PCT_FREE PCT_USED INI_TRANS MAX_TRANS
---------- ---------- ---------- ----------
10 1 255
Please suuggest me...
Of course, as a bitmap index implicitly locks all keys with identical values.
-------------
Sybrand Bakker
Senior Oracle DBA
Tags: Database
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