[ORACLE 10.2.0.5] performance problem with high enq: TX - line lock contention waiting

Hello

I have a performance problem involving high line response to locking conflicts that I can't wait.

The application updates the specific table about 1200 times for my AWR report representing 2 hours.

This update represents 98% of the db_time and wait to enq: TX - line lock conflict is:

-83 796 waiting

-245 441 seconds

The application updates a row both an unprecedented SELECT UPDATES. This is the query:

Update my_table set creationtime =: 1, modificationdate =: version 2, =: creationuserid 3, =: fortesting 4, =: 5, modificationuserid =: participation_uuid 6, =: actimenucontact 7, =: allegroid 8, =: campaign_uuid 9, =: desjardinsemployeetype 10, =: effectiveparticipationtype 11, =: family_uuid 12, =: fetchpasseport 13, =: 14, healthratingfilldate =: hoursofsleeptimecommitment 15, =: igaid 16, =: initialsubscriptiontype 17, =: minutesofsleeptimecommitment 18, =: goal 19, =: partner_uuid 20, =: 21, promotionalemails =: 22, readrules =: sccsubscriptionprovenance 23, =: = subscriptionprovenance 24,: 25, supportemails =: where the 26 uuid = : 27 and = version: 28

Clause where is filtering on uuid which is the primary key of my_table.

The uuid is a specific user and two users would not update the same row, what could be the reason for this wait event?

Thank you

Why guess when you know.

Watch ASH data for these events to the queue.

He'll tell you sql id as well.

Tags: Database

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          <systembezeichnung>Pharmasoft, Infopharm, Wabe, jump</systembezeichnung>
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              <name><![CDATA[HOT THERMO dura C Creme]]></name>
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              <einheit>g</einheit>
              <ampreisvAmg>1</ampreisvAmg>
              <ampreisvSgb>2</ampreisvSgb>
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              <abdaWarengruppe>AM02AB01</abdaWarengruppe>
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              <anbieter>19422</anbieter>
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              <notfalldepot>0</notfalldepot>
              <abgaberegelung>Apothekenpflicht</abgaberegelung>
              <artikelart>Arzneimittel</artikelart>
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              <kalkulierterVk>0</kalkulierterVk>
              <platzierung>keine</platzierung>
              <lagerort>Kein Lagerartikel</lagerort>
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            <fruehesterVerfall>9999-12-31T00:00:00.0</fruehesterVerfall>
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    Anyone has any advice for me?
    I can give you additional information?
    Object / relational is perhaps not the best choice?


    --------------------------------------------------------------------------------
    Oracle Database 11 g Enterprise Edition Release 11.2.0.1.0 - 64 bit Production
    PL/SQL Release 11.2.0.1.0 - Production
    CORE 11.2.0.1.0 Production
    AMT for IBM/AIX RISC System/6000: Version 11.2.0.1.0 - Production
    NLSRTL Version 11.2.0.1.0 - Production

    Alex,

    I don't have your version, but here are my tests on 11.2.0.3:

    Schema records with:

    begin
     dbms_xmlschema.registerSchema(
       schemaURL => 'AdasDwsTypes.xsd'
     , schemaDoc => bfilename('TEST_DIR', 'AdasDwsTypes.xsd')
     , local => true
     , genTypes => true
     , genTables => false
     , enableHierarchy => dbms_xmlschema.ENABLE_HIERARCHY_NONE
     , csid => nls_charset_id('AL32UTF8')
     );
    end;
    /
    
    declare
     v_schema xmltype := xmltype(bfilename('TEST_DIR', 'AdasDws.xsd'),nls_charset_id('WE8ISO8859P1'));
    begin
     dbms_xmlschema_annotate.setTimeStampWithTimeZone(v_schema);
    
     dbms_xmlschema.registerSchema(
       schemaURL => 'AdasDws.xsd'
     , schemaDoc => v_schema
     , local => true
     , genTypes => true
     , genTables => false
     , enableHierarchy => dbms_xmlschema.ENABLE_HIERARCHY_NONE
     );
    end;
    /
    

    Creating table...

    CREATE TABLE T_APOXML (
      ID         NUMBER(10)    NOT NULL
    , XMLDOC     XMLTYPE       NOT NULL
    )
    XMLTYPE COLUMN XMLDOC store AS OBJECT RELATIONAL
    XMLSCHEMA "AdasDws.xsd"
    ELEMENT "adwsroot"
    ;
    

    ... and rename the nested tables of interest:

    begin
     dbms_xmlstorage_manage.renameCollectionTable(
       tab_name => 'T_APOXML'
     , col_name => 'XMLDOC'
     , xpath => '"XMLDATA"."lagerblock"."lager"'
     , collection_table_name => 'T_APOXML_LAGER'
     );
    end;
    /
    
    begin
     dbms_xmlstorage_manage.renameCollectionTable(
       tab_name => 'T_APOXML_LAGER'
     , xpath => 'lagerzeile'
     , collection_table_name => 'T_APOXML_LAGERZEILE'
     );
    end;
    /
    

    Index on "pzn":

    create index T_APOXML_LAGERZEILE_idx on T_APOXML_LAGERZEILE ("pzn");
    

    Queries (remember the stats):

    SQL> set timing on
    SQL> insert into t_apoxml (id, xmldoc)
      2  values(1, xmltype(bfilename('TEST_DIR', 'ADAS_sample.xml'),nls_charset_id('WE8ISO8859P1')))
      3  ;
    
    1 row created.
    
    Elapsed: 00:00:10.03
    SQL> commit;
    
    Commit complete.
    
    Elapsed: 00:00:00.00
    SQL> exec dbms_stats.gather_table_stats(user, 'T_APOXML');
    
    PL/SQL procedure successfully completed.
    
    Elapsed: 00:00:02.54
    SQL> set autotrace traceonly explain
    SQL> set lines 120
    SQL> SELECT xmlquery(
      2          'declare default element namespace "http://www.adas.de/spec/dws/v1"; (::)
      3          /adwsroot/lagerblock/lager/lagerzeile[pzn=$pzn]'
      4          passing xmldoc
      5                , cast( 1001094 as number ) as "pzn"
      6          returning content
      7         )
      8  FROM t_apoxml
      9  WHERE id = 1
     10  ;
    Elapsed: 00:00:00.00
    
    Execution Plan
    ----------------------------------------------------------
    Plan hash value: 1388369865
    
    -------------------------------------------------------------------------------------------------------------
    | Id  | Operation                     | Name                        | Rows  | Bytes | Cost (%CPU)| Time     |
    -------------------------------------------------------------------------------------------------------------
    |   0 | SELECT STATEMENT              |                             |     1 |   173 |     3   (0)| 00:00:01 |
    |   1 |  SORT GROUP BY                |                             |     1 |  4603 |            |       |
    |   2 |   NESTED LOOPS                |                             |     1 |  4603 |     3   (0)| 00:00:01 |
    |   3 |    TABLE ACCESS BY INDEX ROWID| T_APOXML_LAGERZEILE         |     1 |  4570 |     2   (0)| 00:00:01 |
    |*  4 |     INDEX RANGE SCAN          | T_APOXML_LAGERZEILE_IDX     |     1 |       |     1   (0)| 00:00:01 |
    |*  5 |    TABLE ACCESS BY INDEX ROWID| T_APOXML_LAGER              |     1 |    33 |     1   (0)| 00:00:01 |
    |*  6 |     INDEX UNIQUE SCAN         | T_APOXML_LAGERZEILE_MEMBERS |     1 |       |     0   (0)| 00:00:01 |
    |*  7 |  TABLE ACCESS FULL            | T_APOXML                    |     1 |   173 |     3   (0)| 00:00:01 |
    -------------------------------------------------------------------------------------------------------------
    
    Predicate Information (identified by operation id):
    ---------------------------------------------------
    
       4 - access("pzn"=1001094)
       5 - filter("NESTED_TABLE_ID"=:B1)
       6 - access("NESTED_TABLE_ID"="SYS_ALIAS_4"."SYS_NC0000700008$")
       7 - filter("ID"=1)
    
    Note
    -----
       - dynamic sampling used for this statement (level=2)
    
    SQL> SELECT xmlquery(
      2          'declare default element namespace "http://www.adas.de/spec/dws/v1"; (::)
      3          /adwsroot/lagerblock/lager/lagerzeile[pzn=$pzn]'
      4          passing xmldoc
      5                , cast( 2487443 as number ) as "pzn"
      6          returning content
      7         )
      8  FROM t_apoxml
      9  WHERE id = 1
     10  ;
    Elapsed: 00:00:00.00
    
    Execution Plan
    ----------------------------------------------------------
    Plan hash value: 1086728381
    
    -----------------------------------------------------------------------------------------------------
    | Id  | Operation                     | Name                | Rows  | Bytes | Cost (%CPU)| Time     |
    -----------------------------------------------------------------------------------------------------
    |   0 | SELECT STATEMENT              |                     |     1 |   173 |     3   (0)| 00:00:01 |
    |   1 |  SORT GROUP BY                |                     |     1 |  4603 |            |          |
    |*  2 |   HASH JOIN                   |                     |   172 |   773K|   177   (1)| 00:00:03 |
    |   3 |    TABLE ACCESS BY INDEX ROWID| T_APOXML_LAGER      |   172 |  5676 |     6   (0)| 00:00:01 |
    |*  4 |     INDEX RANGE SCAN          | SYS_C0011899        |    69 |       |     2   (0)| 00:00:01 |
    |*  5 |    TABLE ACCESS FULL          | T_APOXML_LAGERZEILE | 18058 |    78M|   171   (1)| 00:00:03 |
    |*  6 |  TABLE ACCESS FULL            | T_APOXML            |     1 |   173 |     3   (0)| 00:00:01 |
    -----------------------------------------------------------------------------------------------------
    
    Predicate Information (identified by operation id):
    ---------------------------------------------------
    
       2 - access("NESTED_TABLE_ID"="SYS_ALIAS_4"."SYS_NC0000700008$")
       4 - access("NESTED_TABLE_ID"=:B1)
       5 - filter("pzn"=2487443)
       6 - filter("ID"=1)
    
    Note
    -----
       - dynamic sampling used for this statement (level=2)
    

    For the first query, the index is used and the execution time is very short.
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    A couple more:

    SQL> set autotrace on explain
    SQL> SELECT l1_lager.pzn AS PZN
      2       , count(*)
      3  FROM t_apoxml t
      4     , XMLTABLE(
      5         XMLNamespaces(default 'http://www.adas.de/spec/dws/v1')
      6       , '/adwsroot/lagerblock/lager/lagerzeile'
      7         PASSING t.xmldoc
      8         COLUMNS  pzn  NUMBER PATH 'pzn'
      9       ) l1_lager
     10  WHERE t.id = 1
     11  GROUP BY l1_lager.pzn
     12  ;
    
           PZN   COUNT(*)
    ---------- ----------
       1001094          1
       2487443      17745
       1218066          1
    
    Elapsed: 00:00:00.26
    
    Execution Plan
    ----------------------------------------------------------
    Plan hash value: 1955193779
    
    ----------------------------------------------------------------------------------------------
    | Id  | Operation              | Name                | Rows  | Bytes | Cost (%CPU)| Time     |
    ----------------------------------------------------------------------------------------------
    |   0 | SELECT STATEMENT       |                     | 17158 |  1055K|   243   (1)| 00:00:03 |
    |   1 |  HASH GROUP BY         |                     | 17158 |  1055K|   243   (1)| 00:00:03 |
    |*  2 |   HASH JOIN            |                     | 17158 |  1055K|   242   (1)| 00:00:03 |
    |   3 |    TABLE ACCESS FULL   | T_APOXML_LAGER      | 17157 |   335K|    68   (0)| 00:00:01 |
    |   4 |    MERGE JOIN CARTESIAN|                     | 18058 |   758K|   173   (0)| 00:00:03 |
    |*  5 |     TABLE ACCESS FULL  | T_APOXML            |     1 |    20 |     3   (0)| 00:00:01 |
    |   6 |     BUFFER SORT        |                     | 18058 |   405K|   170   (0)| 00:00:03 |
    |   7 |      TABLE ACCESS FULL | T_APOXML_LAGERZEILE | 18058 |   405K|   170   (0)| 00:00:03 |
    ----------------------------------------------------------------------------------------------
    
    Predicate Information (identified by operation id):
    ---------------------------------------------------
    
       2 - access("NESTED_TABLE_ID"="T"."SYS_NC0004100042$" AND
                  "NESTED_TABLE_ID"="SYS_ALIAS_3"."SYS_NC0000700008$")
       5 - filter("T"."ID"=1)
    
    Note
    -----
       - dynamic sampling used for this statement (level=2)
    

    Insofar as possible, always specify the full XPath (i.e. no axis down not as / /) and in the COLUMNS clause, use the data types of the real underlying columns.
    In this case:

    SQL> set autotrace traceonly
    SQL> SELECT l1_lager.StandVom
      2       , l2_lagerzeile.*
      3  FROM t_apoxml t
      4     , XMLTable(
      5         XMLNamespaces(default 'http://www.adas.de/spec/dws/v1'),
      6         '/adwsroot/lagerblock/lager'
      7         PASSING t.xmldoc
      8         COLUMNS
      9           StandVom                TIMESTAMP      PATH 'StandVom',
     10           lagerzeile              XMLTYPE        PATH 'lagerzeile'
     11       ) l1_lager
     12     , XMLTABLE(
     13         XMLNamespaces(default 'http://www.adas.de/spec/dws/v1'),
     14         '/lagerzeile'
     15         PASSING l1_lager.lagerzeile
     16         COLUMNS
     17           pzn                     NUMBER         PATH 'pzn',
     18           gtin                    VARCHAR2(4000) PATH 'gtin',
     19           artikelbezeichnung      VARCHAR2(200)  PATH 'name',
     20           menge                   VARCHAR2(28)   PATH 'menge',
     21           einheit                 VARCHAR2(8)    PATH 'einheit',
     22           ampreisvAmg             NUMBER(3)      PATH 'ampreisvAmg',
     23           ampreisvSgb             NUMBER(3)      PATH 'ampreisvSgb',
     24           btm                     NUMBER(3)      PATH 'btm',
     25           abdaWarengruppe         VARCHAR2(32)   PATH 'abdaWarengruppe',
     26           darreichungsform        VARCHAR2(12)   PATH 'darreichungsform',
     27           anbieter                NUMBER         PATH 'anbieter',
     28           lagertemperaturMin      NUMBER(10)     PATH 'lagertemperaturMin',
     29           lagertemperaturMax      NUMBER(10)     PATH 'lagertemperaturMax',
     30           notfalldepot            NUMBER(3)      PATH 'notfalldepot',
     31           abgaberegelung          VARCHAR2(80)   PATH 'abgaberegelung',
     32           artikelart              VARCHAR2(80)   PATH 'artikelart',
     33           mwstsatz                NUMBER(7)      PATH 'mwstsatz',
     34           listenEk                NUMBER(10)     PATH 'listenEk',
     35           listenVk                NUMBER(10)     PATH 'listenVk',
     36           notfalldepotEigen       VARCHAR2(1)    PATH 'notfalldepotEigen',
     37           anLager                 VARCHAR2(1)    PATH 'anLager',
     38           kalkulierterVk          NUMBER(10)     PATH 'kalkulierterVk',
     39           lagerort                VARCHAR2(320)  PATH 'lagerort',
     40           platzierung             VARCHAR2(80)   PATH 'platzierung',
     41           bestand                 NUMBER(10)     PATH 'bestand',
     42           fruehesterVerfall       TIMESTAMP      PATH 'fruehesterVerfall',
     43           bewirtschaftungssart    VARCHAR2(80)   PATH 'bewirtschaftungssart',
     44           nnek                    NUMBER(10)     PATH 'nnek'
     45       ) l2_lagerzeile
     46  WHERE t.id = 1
     47  ;
    
    17747 rows selected.
    
    Elapsed: 00:00:00.82
    
    Execution Plan
    ----------------------------------------------------------
    Plan hash value: 488593731
    
    ---------------------------------------------------------------------------------------------
    | Id  | Operation             | Name                | Rows  | Bytes | Cost (%CPU)| Time     |
    ---------------------------------------------------------------------------------------------
    |   0 | SELECT STATEMENT      |                     | 17158 |    42M|   242   (1)| 00:00:03 |
    |*  1 |  HASH JOIN            |                     | 17158 |    42M|   242   (1)| 00:00:03 |
    |   2 |   TABLE ACCESS FULL   | T_APOXML_LAGER      | 17157 |   552K|    68   (0)| 00:00:01 |
    |   3 |   MERGE JOIN CARTESIAN|                     | 18058 |    43M|   174   (1)| 00:00:03 |
    |*  4 |    TABLE ACCESS FULL  | T_APOXML            |     1 |    20 |     3   (0)| 00:00:01 |
    |   5 |    BUFFER SORT        |                     | 18058 |    43M|   171   (1)| 00:00:03 |
    |   6 |     TABLE ACCESS FULL | T_APOXML_LAGERZEILE | 18058 |    43M|   171   (1)| 00:00:03 |
    ---------------------------------------------------------------------------------------------
    
    Predicate Information (identified by operation id):
    ---------------------------------------------------
    
       1 - access("NESTED_TABLE_ID"="T"."SYS_NC0004100042$" AND
                  "SYS_ALIAS_5"."NESTED_TABLE_ID"="SYS_ALIAS_4"."SYS_NC0000700008$")
       4 - filter("T"."ID"=1)
    
    Note
    -----
       - dynamic sampling used for this statement (level=2)
    
    Statistics
    ----------------------------------------------------------
              0  recursive calls
              2  db block gets
            897  consistent gets
            886  physical reads
              0  redo size
         295154  bytes sent via SQL*Net to client
          13433  bytes received via SQL*Net from client
           1185  SQL*Net roundtrips to/from client
              1  sorts (memory)
              0  sorts (disk)
          17747  rows processed
    
  • Performance problems with large Photo library size

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    Hi Tenneil,

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    Kind regards

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                         FROM order_lines_flmnt_stg_in ol,
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    Copyright (c) 1982, 2005, Oracle.  All rights reserved.
    
    
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      3                            order_header_flmnt_stg_in oh,
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     10                                      order_header_flmnt_stg_in oh
     11                                WHERE oh.po_id = ol.po_id
     12                                  AND ol.item_code = oln.item_code)
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     14                             AND oh.error_message IS NULL
     15                             AND oh.activate_flag = 1
     16                            );
    
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