DB related links wait event
Dear Sir
In one of my db, I use db link to generate the report for a different database. The db in which we use the dblink to remote databases; the following wait events are showed continuous:
PX Deq Credit: send blkd
PX Deq: Execution Msg
SQL * Net message from client
They indicate any problem? How can we get rid of it?
Kind regards
Hello
What should worry, to this end, I have sguuest read you link below.
As the default value for sufficient, depends on place on many factors as optimizer, which can not sometimes be enough when set to default values, cpu, memory, data, resources.
Concerning
Jihane Narain Sylca
Tags: Database
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> Can conclude that the most important issue on the database is db file sequential read and should be the subject of an investigation?
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This is a problem only if you too (in many calls of i/o) or slow (long of IO call duration)
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Below is a summary of the issue I faced, followed by details.
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Published by: joshic on June 30, 2010 04:25joshic wrote:
Hi all
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The blocker for RBAL 167 session, which is "DBW0. I couldn't find any information on this wait event ' enq: FP - global fob contention "." I'm not able to make further progress on this matter, so any help will be much appreciated.Looks like Bug 7334426: BACKUP HANG ON A HANG CONDITION BETWEEN DBW AND RBAL
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Using sql, an event is - sysman - who
and the other est--oracle@ora (J003)
------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------
Top 5 timed events
Event waits time Avg Wait (ms) % Total call time wait class
Time CPU 40.8 13 283
db file scattered read 3 434 917 2 5 769 17.7 of the user/o i
ENQ: TX - conflict 9 846 4 809 488 14.8 Application line lock
DB file sequential read 3 664 522 1 4 528 13.9 user I/O
GC cr multi block 3 151 754 1 025 Cluster 3.1 request3 0
----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------
Why this enq: TX - conflict of line lock having the lock for sysman & backround process
is that this will affect the performance of the database
RDS
Published by: user1000000 on September 14, 2009 07:54This is the reason why nobody will answer your question probably :-)
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We found all sessions waiting performing this query below:
For a clear view of the execution plan:(SELECT /*+ORDERED*/ ud.user_id, DECODE (udl.new_user_name, NULL, ud.user_name, udl.new_user_name ) AS user_name, udl.old_user_name, ud.PASSWORD, ud.status, au.first_name, au.last_name, sd.sd_id, sd.site_id, s.manager_number, sd.delivery_code, sd.site_server_id, au.email_address, au.outorg_id, udl.action_code, udl.action_category, udl.action_date AS action_date, au.admin_users_uid FROM user_delivery_log udl, user_delivery ud, appuser au, site_delivery sd, site_t s WHERE udl.action_date BETWEEN TO_DATE ('04/21/2009 17/46/25', 'MM/DD/YYYY HH24/MI/SS' ) AND TO_DATE ('04/21/2009 17/47/26', 'MM/DD/YYYY HH24/MI/SS' ) AND ( (udl.action_category = 'I' AND BITAND (udl.action_code, 8195) != 0 ) OR (udl.action_category = 'U' AND BITAND (udl.action_code, 2079) != 0 ) ) AND udl.site_id != 0 AND ud.user_id = udl.user_id AND ud.sd_id = udl.sd_id AND ud.user_id = au.user_id AND ud.sd_id = sd.sd_id AND sd.site_id = s.site_id AND (sd.delivery_code = 'AEN') AND ( udl.new_user_name IS NOT NULL OR 0 = ((SELECT /*+ORDERED*/ COUNT (*) FROM user_delivery_log udl1 WHERE udl1.action_date BETWEEN TO_DATE ('04/21/2009 17/46/25', 'MM/DD/YYYY HH24/MI/SS' ) AND TO_DATE ('04/21/2009 17/47/26', 'MM/DD/YYYY HH24/MI/SS' ) AND ( ( udl1.action_category = 'I' AND BITAND (udl1.action_code, 8195) != 0 ) OR ( udl1.action_category = 'U' AND BITAND (udl1.action_code, 2079) != 0 ) ) AND udl1.site_id != 0 AND udl1.sd_id = ud.sd_id AND udl1.user_id = ud.user_id AND udl1.new_user_name IS NOT NULL)) )) UNION (SELECT /*+ORDERED*/ ud.user_id, DECODE (udl.new_user_name, NULL, ud.user_name, udl.new_user_name ) AS user_name, NULL AS old_user_name, ud.PASSWORD, ud.status, au.first_name, au.last_name, sd.sd_id, sd.site_id, s.manager_number, sd.delivery_code, sd.site_server_id, au.email_address, au.outorg_id, 1536, 'U', udl.action_date AS action_date, au.admin_users_uid FROM user_delivery_log udl, user_delivery ud, appuser au, site_delivery sd, site_t s WHERE (udl.user_id, udl.action_date) IN ( SELECT udl.user_id, MAX (action_date) FROM user_delivery_log udl WHERE udl.action_date < TO_DATE ('04/21/2009 17/46/25', 'MM/DD/YYYY HH24/MI/SS') AND ( ( udl.action_category = 'I' AND BITAND (udl.action_code, 8195) != 0 ) OR ( udl.action_category = 'U' AND BITAND (udl.action_code, 2079) != 0 ) ) AND udl.user_id IN ( SELECT user_id FROM appuser_log aul WHERE aul.action_date BETWEEN TO_DATE ('04/21/2009 17/46/25', 'MM/DD/YYYY HH24/MI/SS' ) AND TO_DATE ('04/21/2009 17/47/26', 'MM/DD/YYYY HH24/MI/SS' ) AND aul.action_category = 'U' AND BITAND (aul.action_code, 5632) != 0) AND udl.new_user_name IS NOT NULL GROUP BY user_id) AND udl.site_id != 0 AND 0 = (SELECT COUNT (*) FROM user_delivery_log udl, site_delivery sd WHERE udl.action_date BETWEEN TO_DATE ('04/21/2009 17/46/25', 'MM/DD/YYYY HH24/MI/SS' ) AND TO_DATE ('04/21/2009 17/47/26', 'MM/DD/YYYY HH24/MI/SS' ) AND ( ( udl.action_category = 'I' AND BITAND (udl.action_code, 8195) != 0 ) OR ( udl.action_category = 'U' AND BITAND (udl.action_code, 2079) != 0 ) ) AND udl.site_id != 0 AND udl.sd_id = sd.sd_id AND udl.user_id = au.user_id AND (sd.delivery_code = 'AEN')) AND ud.user_id = au.user_id AND ud.user_id = udl.user_id AND ud.sd_id = sd.sd_id AND sd.site_id = s.site_id AND (sd.delivery_code = 'AEN')) ORDER BY action_date ASC; Below is the execution plan: Execution Plan ---------------------------------------------------------- 0 SELECT STATEMENT Optimizer=RULE (Cost=341 Card=3 Bytes=312) 1 0 SORT (UNIQUE) (Cost=342 Card=3 Bytes=312) 2 1 UNION-ALL 3 2 CONCATENATION 4 3 FILTER 5 4 NESTED LOOPS (Cost=12 Card=1 Bytes=100) 6 5 NESTED LOOPS (Cost=11 Card=1 Bytes=94) 7 6 NESTED LOOPS (Cost=10 Card=1 Bytes=77) 8 7 NESTED LOOPS (Cost=8 Card=1 Bytes=52) 9 8 TABLE ACCESS (BY INDEX ROWID) OF 'USER_DEL IVERY_LOG' (Cost=4 Card=2 Bytes=58) 10 9 INDEX (RANGE SCAN) OF 'IE1_USER_DELIVERY _LOG' (NON-UNIQUE) (Cost=3 Card=2) 11 8 TABLE ACCESS (BY INDEX ROWID) OF 'USER_DEL IVERY' (Cost=2 Card=1192563 Bytes=27428949) 12 11 INDEX (UNIQUE SCAN) OF 'IDX_PK_INV_USER_ SD_ID' (UNIQUE) (Cost=1 Card=1192563) 13 7 TABLE ACCESS (BY INDEX ROWID) OF 'APPUSER' ( Cost=2 Card=863102 Bytes=21577550) 14 13 INDEX (UNIQUE SCAN) OF 'PK_APPUSER' (UNIQU E) (Cost=1 Card=863102) 15 6 TABLE ACCESS (BY INDEX ROWID) OF 'SITE_DELIVER Y' (Cost=1 Card=3494 Bytes=59398) 16 15 INDEX (UNIQUE SCAN) OF 'PK_NEW_SITE_DELIVERY ' (UNIQUE) 17 5 TABLE ACCESS (BY INDEX ROWID) OF 'SITE_T' (Cost= 1 Card=64113 Bytes=384678) 18 17 INDEX (UNIQUE SCAN) OF 'PK_SITE_T' (UNIQUE) 19 4 TABLE ACCESS (BY INDEX ROWID) OF 'USER_DELIVERY_LO G' (Cost=6 Card=1 Bytes=27) 20 19 INDEX (RANGE SCAN) OF 'IE1_USER_DELIVERY_LOG' (N ON-UNIQUE) (Cost=3 Card=1) 21 3 FILTER 22 21 NESTED LOOPS (Cost=12 Card=1 Bytes=100) 23 22 NESTED LOOPS (Cost=11 Card=1 Bytes=94) 24 23 NESTED LOOPS (Cost=10 Card=1 Bytes=77) 25 24 NESTED LOOPS (Cost=8 Card=1 Bytes=52) 26 25 TABLE ACCESS (BY INDEX ROWID) OF 'USER_DEL IVERY_LOG' (Cost=4 Card=2 Bytes=58) 27 26 INDEX (RANGE SCAN) OF 'IE1_USER_DELIVERY _LOG' (NON-UNIQUE) (Cost=3 Card=2) 28 25 TABLE ACCESS (BY INDEX ROWID) OF 'USER_DEL IVERY' (Cost=2 Card=1192563 Bytes=27428949) 29 28 INDEX (UNIQUE SCAN) OF 'IDX_PK_INV_USER_ SD_ID' (UNIQUE) (Cost=1 Card=1192563) 30 24 TABLE ACCESS (BY INDEX ROWID) OF 'APPUSER' ( Cost=2 Card=863102 Bytes=21577550) 31 30 INDEX (UNIQUE SCAN) OF 'PK_APPUSER' (UNIQU E) (Cost=1 Card=863102) 32 23 TABLE ACCESS (BY INDEX ROWID) OF 'SITE_DELIVER Y' (Cost=1 Card=3494 Bytes=59398) 33 32 INDEX (UNIQUE SCAN) OF 'PK_NEW_SITE_DELIVERY ' (UNIQUE) 34 22 TABLE ACCESS (BY INDEX ROWID) OF 'SITE_T' (Cost= 1 Card=64113 Bytes=384678) 35 34 INDEX (UNIQUE SCAN) OF 'PK_SITE_T' (UNIQUE) 36 2 NESTED LOOPS (Cost=314 Card=1 Bytes=112) 37 36 NESTED LOOPS (Cost=313 Card=1 Bytes=106) 38 37 NESTED LOOPS (Cost=312 Card=1 Bytes=89) 39 38 NESTED LOOPS (Cost=310 Card=1 Bytes=64) 40 39 NESTED LOOPS (Cost=306 Card=1 Bytes=41) 41 40 VIEW OF 'VW_NSO_1' (Cost=302 Card=1 Bytes=22 ) 42 41 SORT (GROUP BY) (Cost=302 Card=1 Bytes=35) 43 42 NESTED LOOPS (Cost=299 Card=1 Bytes=35) 44 43 TABLE ACCESS (FULL) OF 'APPUSER_LOG' ( Cost=93 Card=1 Bytes=16) 45 43 TABLE ACCESS (FULL) OF 'USER_DELIVERY_ LOG' (Cost=206 Card=73505 Bytes=1396595) 46 40 TABLE ACCESS (BY INDEX ROWID) OF 'USER_DELIV ERY_LOG' (Cost=4 Card=429251 Bytes=8155769) 47 46 INDEX (RANGE SCAN) OF 'IE1_USER_DELIVERY_L OG' (NON-UNIQUE) (Cost=3 Card=429251) 48 39 TABLE ACCESS (BY INDEX ROWID) OF 'USER_DELIVER Y' (Cost=4 Card=1192563 Bytes=27428949) 49 48 INDEX (RANGE SCAN) OF 'IDX_PK_INV_USER_SD_ID ' (UNIQUE) (Cost=3 Card=1192563) 50 38 TABLE ACCESS (BY INDEX ROWID) OF 'APPUSER' (Cost =2 Card=43156 Bytes=1078900) 51 50 INDEX (UNIQUE SCAN) OF 'PK_APPUSER' (UNIQUE) ( Cost=1 Card=43156) 52 51 NESTED LOOPS (Cost=7 Card=1 Bytes=31) 53 52 TABLE ACCESS (BY INDEX ROWID) OF 'USER_DEL IVERY_LOG' (Cost=6 Card=1 Bytes=24) 54 53 INDEX (RANGE SCAN) OF 'IE1_USER_DELIVERY _LOG' (NON-UNIQUE) (Cost=3 Card=1) 55 52 TABLE ACCESS (BY INDEX ROWID) OF 'SITE_DEL IVERY' (Cost=1 Card=3494 Bytes=24458) 56 55 INDEX (UNIQUE SCAN) OF 'PK_NEW_SITE_DELI VERY' (UNIQUE) 57 37 TABLE ACCESS (BY INDEX ROWID) OF 'SITE_DELIVERY' ( Cost=1 Card=3494 Bytes=59398) 58 57 INDEX (UNIQUE SCAN) OF 'PK_NEW_SITE_DELIVERY' (U NIQUE) 59 36 TABLE ACCESS (BY INDEX ROWID) OF 'SITE_T' (Cost=1 Ca rd=64113 Bytes=384678) 60 59 INDEX (UNIQUE SCAN) OF 'PK_SITE_T' (UNIQUE)
All the locks of CBC point to the APPUSER_LOG and USER_DELIVERY_LOG tables.Plan Table -------------------------------------------------------------------------------------------------------- | Operation | Name | Rows | Bytes| Cost | Pstart| Pstop | -------------------------------------------------------------------------------- | SELECT STATEMENT | | 3 | 312 | 341 | | | | SORT UNIQUE | | 3 | 312 | 342 | | | | UNION-ALL | | | | | | | | CONCATENATION | | | | | | | | FILTER | | | | | | | | NESTED LOOPS | | 1 | 100 | 12 | | | | NESTED LOOPS | | 1 | 94 | 11 | | | | NESTED LOOPS | | 1 | 77 | 10 | | | | NESTED LOOPS | | 1 | 52 | 8 | | | | TABLE ACCESS BY I|USER_DELI | 2 | 58 | 4 | | | | INDEX RANGE SCAN|IE1_USER_ | 2 | | 3 | | | | TABLE ACCESS BY I|USER_DELI | 1M| 26M| 2 | | | | INDEX UNIQUE SCA|IDX_PK_IN | 1M| | 1 | | | | TABLE ACCESS BY IN|APPUSER | 863K| 20M| 2 | | | | INDEX UNIQUE SCAN|PK_APPUSE | 863K| | 1 | | | | TABLE ACCESS BY IND|SITE_DELI | 3K| 58K| 1 | | | | INDEX UNIQUE SCAN |PK_NEW_SI | 3K| | | | | | TABLE ACCESS BY INDE|SITE_T | 64K| 375K| 1 | | | | INDEX UNIQUE SCAN |PK_SITE_T | 64K| | | | | | TABLE ACCESS BY INDEX|USER_DELI | 1 | 27 | 6 | | | | INDEX RANGE SCAN |IE1_USER_ | 1 | | 3 | | | | FILTER | | | | | | | | NESTED LOOPS | | 1 | 100 | 12 | | | | NESTED LOOPS | | 1 | 94 | 11 | | | | NESTED LOOPS | | 1 | 77 | 10 | | | | NESTED LOOPS | | 1 | 52 | 8 | | | | TABLE ACCESS BY I|USER_DELI | 2 | 58 | 4 | | | | INDEX RANGE SCAN|IE1_USER_ | 2 | | 3 | | | | TABLE ACCESS BY I|USER_DELI | 1M| 26M| 2 | | | | INDEX UNIQUE SCA|IDX_PK_IN | 1M| | 1 | | | | TABLE ACCESS BY IN|APPUSER | 863K| 20M| 2 | | | | INDEX UNIQUE SCAN|PK_APPUSE | 863K| | 1 | | | | TABLE ACCESS BY IND|SITE_DELI | 3K| 58K| 1 | | | | INDEX UNIQUE SCAN |PK_NEW_SI | 3K| | | | | | TABLE ACCESS BY INDE|SITE_T | 64K| 375K| 1 | | | | INDEX UNIQUE SCAN |PK_SITE_T | 64K| | | | | | NESTED LOOPS | | 1 | 112 | 314 | | | | NESTED LOOPS | | 1 | 106 | 313 | | | | NESTED LOOPS | | 1 | 89 | 312 | | | | NESTED LOOPS | | 1 | 64 | 310 | | | | NESTED LOOPS | | 1 | 41 | 306 | | | | VIEW |VW_NSO_1 | 1 | 22 | 302 | | | | SORT GROUP BY | | 1 | 35 | 302 | | | | NESTED LOOPS | | 1 | 35 | 299 | | | | TABLE ACCESS FU|APPUSER_L | 1 | 16 | 93 | | | | TABLE ACCESS FU|USER_DELI | 73K| 1M| 206 | | | | TABLE ACCESS BY IN|USER_DELI | 429K| 7M| 4 | | | | INDEX RANGE SCAN |IE1_USER_ | 429K| | 3 | | | | TABLE ACCESS BY IND|USER_DELI | 1M| 26M| 4 | | | | INDEX RANGE SCAN |IDX_PK_IN | 1M| | 3 | | | | TABLE ACCESS BY INDE|APPUSER | 43K| 1M| 2 | | | | INDEX UNIQUE SCAN |PK_APPUSE | 43K| | 1 | | | | NESTED LOOPS | | 1 | 31 | 7 | | | | TABLE ACCESS BY I|USER_DELI | 1 | 24 | 6 | | | | INDEX RANGE SCAN|IE1_USER_ | 1 | | 3 | | | | TABLE ACCESS BY I|SITE_DELI | 3K| 23K| 1 | | | | INDEX UNIQUE SCA|PK_NEW_SI | 3K| | | | | | TABLE ACCESS BY INDEX|SITE_DELI | 3K| 58K| 1 | | | | INDEX UNIQUE SCAN |PK_NEW_SI | 3K| | | | | | TABLE ACCESS BY INDEX |SITE_T | 64K| 375K| 1 | | | | INDEX UNIQUE SCAN |PK_SITE_T | 64K| | | | | --------------------------------------------------------------------------------
Could someone help me please in the setting of this query, I need to avoid latch and scattered read... .as application knows huge slow...
-YasserYasserRACDBA wrote:
Oracle version: 8.1.6.0.0
The optimizer mode is RULEWe found all sessions waiting performing this query below:
(SELECT /*+ORDERED*/Even if you run based on rules in general, this query will run based on costs due to the indicator.
Do you have statistics in place to support the OBC?| VIEW |VW_NSO_1 | 1 | 22 | 302 | | |
| SORT GROUP BY | | 1 | 35 | 302 | | |
| NESTED LOOPS | | 1 | 35 | 299 | | |
| TABLE ACCESS FU|APPUSER_L | 1 | 16 | 93 | | |
| TABLE ACCESS FU|USER_DELI | 73K| 1M| 206 | | |This is typical of an unnested "IN" subquery - it looks like the optimiser has unnested your double-level IN subquery finding the maximum action date for a user who has done something in the last minute into a massive group and aggregate (so we've got unnesting and complex view merging all in one - I don't think I've seen that in 8i before).Your db file scattered reads are probably extreme because (a) the USER_DELIxxxx table is big, and (b) the number of rows you are getting from the APPUSER_Lxxx table is more than the one that Oracle expects. You may find that collecting stats on APPUSER_Lxxx addresses this issue
I can't see any reason why the appuser_log table should be subject to cache buffers chains latch problems - if the plan is true than the only thing it suffers is one full scan. However, given the "one row" estimate that comes out of the VW_NOS_1 line, the optimizer is free to do all sorts of silly things as it works through the chain of nested loops, and if the number of rows from the driver is much more than one then the indexed activity against USER_DELIxxx could be huge.
For example:
| TABLE ACCESS BY IN|USER_DELI | 429K| 7M| 4 | | | | INDEX RANGE SCAN |IE1_USER_ | 429K| | 3 | | |Is the next step in this nested loop (and similar things happen more down and in the previous sections of the plan) suggesting that a systematic index scan rnage will pick up thousands of lines - which, even if only about right, could mean a huge number of buffer visits to the table. ... the numbers don't make real sense, either by the way, but once again, it is probably due to the lack of appropriate statistics.
Concerning
Jonathan Lewis
http://jonathanlewis.WordPress.com
http://www.jlcomp.demon.co.UK"Science is more than a body of knowledge; It's a way of thinking. "
Carl Sagan
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