Analyze tables after creating indexes

Hi all

I created new clues on the production environment, we must analyze tables after creating indexes. Why and what analysis do?

Thanks for the help.
Select * from V$version;

Oracle Database 10g Enterprise Edition Release 10.2.0.4.0 - 64bi
PL/SQL Release 10.2.0.4.0 - Production
"CORE     10.2.0.4.0     Production"
TNS for HPUX: Version 10.2.0.4.0 - Production
NLSRTL Version 10.2.0.4.0 - Production

There are so many different options and you'll certainly want to tweak your stats based on your system.
The best thing to do is to read about dbms_stats:
http://download.Oracle.com/docs/CD/B19306_01/server.102/b14211/stats.htm#PFGRF30102
http://download.Oracle.com/docs/CD/B19306_01/AppDev.102/b14258/d_stats.htm#CIHEHDFB

Here are a few examples to give you an idea of what they look like and how to perform:

BEGIN
  DBMS_STATS.GATHER_TABLE_STATS(OWNNAME          => 'schema_name',
                                TABNAME          => 'table_name',
                                ESTIMATE_PERCENT => DBMS_STATS.AUTO_SAMPLE_SIZE, --> For really big tables oracle can just do a specific percent
                                METHOD_OPT       => 'for all columns size 1', --> Defines Histograms, size one disables histograms
                                DEGREE           => 12, --> The degree of parallelism so you'll see 12 parallel threads gathering stats
                                CASCADE          => TRUE); --> gather stats on the table's indexes also
END; 

BEGIN
  DBMS_STATS.GATHER_INDEX_STATS(OWNNAME          => 'schema_name',
                                INDNAME          => 'index_name',
                                ESTIMATE_PERCENT => 50,
                                DEGREE           => 4);
END;

You can also do

DBMS_STATS.gather_schema_stats
DBMS_STATS.gather_database_stats

and much more...

I really want to focus on the need to do your homework on them,
read the docs I linked and adjust your statistical parameters to fit your db objects and how they are accessed/used.
Having accurate and meaningful statistics are very important to the performance of the database.

Tags: Database

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VARRAY "XML_CONTENT"."XMLDATA"."action" STORE AS TABLE "T_OR_MON_ACTION" (
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XMLTYPE XML_CONTENT STORE AS OBJECT RELATIONAL XMLSCHEMA "http://mydomain.com/cs.xsd" ELEMENT "monitoring";

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XMLTABLE( 
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  $i1/eventId,              
  $i2            
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  EVENT_ID VARCHAR(40) PATH 'eventId', 
  ACTION_SUB_ID INTEGER PATH 'action/actionSubId', 
  ACTION_TYPE VARCHAR2(100) PATH 'action/type', 
  ACTION_TIMESTAMP NUMBER(13,0) PATH 'action/time' 
) T2 
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)

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    ----------------------------------------------------------------------------------------------------------

    | ID | Operation | Name                        | Lines | Bytes | TempSpc | Cost (% CPU). Time |

    ----------------------------------------------------------------------------------------------------------

    |   0 | SELECT STATEMENT |                             |  1609K |  6316M |       |  6110K (1) | 20:22:11 |

    |*  1 |  HASH JOIN |                             |  1609K |  6316M |   111 M |  6110K (1) | 20:22:11 |

    |   2.   TABLE ACCESS FULL | T_C_RMP_MNTRNG_XML_FULL_IL4 |   582K |   104 M |       |  5241 (1) | 00:01:03 |

    |*  3 |   TABLE ACCESS FULL | T_OR_MON_ACTION |    32 M |   117G |       |   105K (2) | 00:21:08 |

    ----------------------------------------------------------------------------------------------------------

    Information of predicates (identified by the operation identity card):

    ---------------------------------------------------

    1 - access ("NESTED_TABLE_ID"= "T_C_RMP_MNTRNG_XML_FULL_IL4"." ("SYS_NC0001300014$")

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    G_XML_FULL_IL4 ". "" $ SYS_NC00017 ", NULL, SYS_XMLCONV ("T_C_RMP_MNTRNG_XML_FULL_IL4". "SYS_NC00012$", 0.32,

    (('EC1EEF23FD023A27E04032A06D930A8D', 3, 3783, 1)), SYS_MAKEXML ('EC1EEF23FD023A27E04032A06D930A8D', 3780,

    'T_C_RMP_MNTRNG_XML_FULL_IL4 '. "' SYS_NC00008$ ', 'SYS_ALIAS_0 '. ((("' SYS_NC_ROWINFO$ ')),'/ ID ', NULL), 0,.

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    Note

    -----

    -dynamic sample used for this survey (level = 2)

    -Construction detected no optimized XML (activate XMLOptimizationCheck for more information)

    The XML schema looks like this:

    <?xml version="1.0" encoding="UTF-8"?>
<xs:schema xmlns:xs="http://www.w3.org/2001/XMLSchema" elementFormDefault="qualified" xmlns:oraxdb="http://xmlns.oracle.com/xdb" oraxdb:storeVarrayAsTable="true" oraxdb:flags="2105639" oraxdb:schemaURL="http://mydomain.com/cs.xsd" oraxdb:schemaOwner="MYUSER" oraxdb:numProps="23">
  <xs:element name="monitoring" oraxdb:propNumber="3785" oraxdb:global="true" oraxdb:SQLName="monitoring" oraxdb:SQLType="monitoring755_T" oraxdb:SQLSchema="MYUSER" oraxdb:memType="258" oraxdb:defaultTable="monitoring757_TAB" oraxdb:defaultTableSchema="MYUSER">
    <xs:complexType oraxdb:SQLType="monitoring755_T" oraxdb:SQLSchema="MYUSER">
      <xs:sequence>
        <xs:element maxOccurs="unbounded" ref="action" oraxdb:propNumber="3780" oraxdb:global="false" oraxdb:SQLName="action" oraxdb:SQLType="action752_T" oraxdb:SQLSchema="MYUSER" oraxdb:memType="258" oraxdb:MemInline="false" oraxdb:SQLInline="true" oraxdb:JavaInline="false" oraxdb:SQLCollType="action756_COLL" oraxdb:SQLCollSchema="MYUSER"/>
        <xs:element ref="reservationType" oraxdb:propNumber="3781" oraxdb:global="false" oraxdb:SQLName="reservationType" oraxdb:SQLType="VARCHAR2" oraxdb:memType="1" oraxdb:MemInline="false" oraxdb:SQLInline="true" oraxdb:JavaInline="false"/>
        <xs:element ref="softwareVersion" oraxdb:propNumber="3782" oraxdb:global="false" oraxdb:SQLName="softwareVersion" oraxdb:SQLType="VARCHAR2" oraxdb:memType="1" oraxdb:MemInline="false" oraxdb:SQLInline="true" oraxdb:JavaInline="false"/>
        <xs:element ref="eventId" oraxdb:propNumber="3783" oraxdb:global="false" oraxdb:SQLName="eventId" oraxdb:SQLType="VARCHAR2" oraxdb:memType="1" oraxdb:MemInline="false" oraxdb:SQLInline="true" oraxdb:JavaInline="false"/>
        <xs:element ref="vin" oraxdb:propNumber="3784" oraxdb:global="false" oraxdb:SQLName="vin" oraxdb:SQLType="VARCHAR2" oraxdb:memType="1" oraxdb:MemInline="false" oraxdb:SQLInline="true" oraxdb:JavaInline="false"/>
      </xs:sequence>
    </xs:complexType>
  </xs:element>
  <xs:element name="action" oraxdb:propNumber="3790" oraxdb:global="true" oraxdb:SQLName="action" oraxdb:SQLType="action752_T" oraxdb:SQLSchema="MYUSER" oraxdb:memType="258" oraxdb:defaultTable="action754_TAB" oraxdb:defaultTableSchema="MYUSER">
    <xs:complexType oraxdb:SQLType="action752_T" oraxdb:SQLSchema="MYUSER">
      <xs:sequence>
        <xs:element ref="type" oraxdb:propNumber="3786" oraxdb:global="false" oraxdb:SQLName="type" oraxdb:SQLType="VARCHAR2" oraxdb:memType="1" oraxdb:MemInline="false" oraxdb:SQLInline="true" oraxdb:JavaInline="false"/>
        <xs:element maxOccurs="unbounded" ref="param" oraxdb:propNumber="3787" oraxdb:global="false" oraxdb:SQLName="param" oraxdb:SQLType="param749_T" oraxdb:SQLSchema="MYUSER" oraxdb:memType="258" oraxdb:MemInline="false" oraxdb:SQLInline="true" oraxdb:JavaInline="false" oraxdb:SQLCollType="param753_COLL" oraxdb:SQLCollSchema="MYUSER"/>
        <xs:element ref="actionSubId" oraxdb:propNumber="3788" oraxdb:global="false" oraxdb:SQLName="actionSubId" oraxdb:SQLType="NUMBER" oraxdb:memType="2" oraxdb:MemInline="false" oraxdb:SQLInline="true" oraxdb:JavaInline="false"/>
        <xs:element ref="time" oraxdb:propNumber="3789" oraxdb:global="false" oraxdb:SQLName="time" oraxdb:SQLType="NUMBER" oraxdb:memType="2" oraxdb:MemInline="false" oraxdb:SQLInline="true" oraxdb:JavaInline="false"/>
      </xs:sequence>
    </xs:complexType>
  </xs:element>
  <xs:element name="type" type="xs:string" oraxdb:propNumber="3791" oraxdb:global="true" oraxdb:SQLName="type" oraxdb:SQLType="VARCHAR2" oraxdb:memType="1" oraxdb:defaultTable="type751_TAB" oraxdb:defaultTableSchema="MYUSER"/>
  <xs:element name="param" oraxdb:propNumber="3794" oraxdb:global="true" oraxdb:SQLName="param" oraxdb:SQLType="param749_T" oraxdb:SQLSchema="MYUSER" oraxdb:memType="258" oraxdb:defaultTable="param750_TAB" oraxdb:defaultTableSchema="MYUSER">
    <xs:complexType oraxdb:SQLType="param749_T" oraxdb:SQLSchema="MYUSER">
      <xs:sequence>
        <xs:element minOccurs="0" ref="value" oraxdb:propNumber="3792" oraxdb:global="false" oraxdb:SQLName="value" oraxdb:SQLType="VARCHAR2" oraxdb:memType="1" oraxdb:MemInline="false" oraxdb:SQLInline="true" oraxdb:JavaInline="false"/>
        <xs:element ref="key" oraxdb:propNumber="3793" oraxdb:global="false" oraxdb:SQLName="key" oraxdb:SQLType="VARCHAR2" oraxdb:memType="1" oraxdb:MemInline="false" oraxdb:SQLInline="true" oraxdb:JavaInline="false"/>
      </xs:sequence>
    </xs:complexType>
  </xs:element>
  <xs:element name="value" type="xs:string" oraxdb:propNumber="3795" oraxdb:global="true" oraxdb:SQLName="value" oraxdb:SQLType="VARCHAR2" oraxdb:memType="1" oraxdb:defaultTable="value748_TAB" oraxdb:defaultTableSchema="MYUSER"/>
  <xs:element name="key" type="xs:string" oraxdb:propNumber="3796" oraxdb:global="true" oraxdb:SQLName="key" oraxdb:SQLType="VARCHAR2" oraxdb:memType="1" oraxdb:defaultTable="key747_TAB" oraxdb:defaultTableSchema="MYUSER"/>
  <xs:element name="actionSubId" type="xs:integer" oraxdb:propNumber="3797" oraxdb:global="true" oraxdb:SQLName="actionSubId" oraxdb:SQLType="NUMBER" oraxdb:memType="2" oraxdb:defaultTable="actionSubId746_TAB" oraxdb:defaultTableSchema="MYUSER"/>
  <xs:element name="time" type="xs:integer" oraxdb:propNumber="3798" oraxdb:global="true" oraxdb:SQLName="time" oraxdb:SQLType="NUMBER" oraxdb:memType="2" oraxdb:defaultTable="time745_TAB" oraxdb:defaultTableSchema="MYUSER"/>
  <xs:element name="reservationType" type="xs:string" oraxdb:propNumber="3799" oraxdb:global="true" oraxdb:SQLName="reservationType" oraxdb:SQLType="VARCHAR2" oraxdb:memType="1" oraxdb:defaultTable="reservationType744_TAB" oraxdb:defaultTableSchema="MYUSER"/>
  <xs:element name="softwareVersion" type="xs:string" oraxdb:propNumber="3800" oraxdb:global="true" oraxdb:SQLName="softwareVersion" oraxdb:SQLType="VARCHAR2" oraxdb:memType="1" oraxdb:defaultTable="softwareVersion743_TAB" oraxdb:defaultTableSchema="MYUSER"/>
  <xs:element name="eventId" type="xs:string" oraxdb:propNumber="3801" oraxdb:global="true" oraxdb:SQLName="eventId" oraxdb:SQLType="VARCHAR2" oraxdb:memType="1" oraxdb:defaultTable="eventId742_TAB" oraxdb:defaultTableSchema="MYUSER"/>
  <xs:element name="vin" type="xs:string" oraxdb:propNumber="3802" oraxdb:global="true" oraxdb:SQLName="vin" oraxdb:SQLType="VARCHAR2" oraxdb:memType="1" oraxdb:defaultTable="vin741_TAB" oraxdb:defaultTableSchema="MYUSER"/>
</xs:schema>

    How can I create an index on these tables of the ordered collection to improve performance?

    I found the example at http://docs.Oracle.com/CD/E11882_01/AppDev.112/e23094/xdb_rewrite.htm#ADXDB5859 but am not able to apply to this particular case...

    Thank you in advance...

    If the schema is not annotated and XS: Integer and XS: String are mapped to types of data NUMBER and VARCHAR2 (4000), so you must use in your query to avoid typecasting unnecessary operations.

    You must also use XMLTABLEs chained when accessing a parent/child instead of a FLWOR expression relationship, otherwise the CBO cannot rewrite the XQuery query correctly (maybe it's fixed in the latest version).

    If you make these changes, the plan should show the cleaner predicates:

    SQL > SELECT EVENT_ID, MESSAGE_ID, ACTION_TYPE, ACTION_SUB_ID, ACTION_TIMESTAMP

    2 FROM test_table

    3 XMLTABLE ('/ monitoring ')

    4 COLUMNS XML_CONTENT OF PASSAGE

    5 WAY of VARCHAR2 (4000) EVENT_ID "ID."

    6 actions for XMLTYPE PATH 'action '.

    (7) T1,

    8 XMLTABLE ('/ action')

    Shares of PASSAGE 9 COLUMNS

    NUMBER of ACTION_SUB_ID 10 PATH "actionSubId."

    11 PATH of VARCHAR2 (4000) ACTION_TYPE "type."

    12 WAY of NUMBER ACTION_TIMESTAMP 'time '.

    (13) T2

    14 WHERE EVENT_ID IS NOT NULL

    15 AND ACTION_SUB_ID IS NOT NULL

    16;

    Execution plan

    ----------------------------------------------------------

    Hash value of plan: 1763884463

    ------------------------------------------------------------------------------------------------

    | ID | Operation | Name | Lines | Bytes | Cost (% CPU). Time |

    ------------------------------------------------------------------------------------------------

    |   0 | SELECT STATEMENT |                 |   109.   220K |     6 (17). 00:00:01 |

    |   1.  THE MERGE JOIN.                 |   109.   220K |     6 (17). 00:00:01 |

    |*  2 |   TABLE ACCESS BY INDEX ROWID | TEST_TABLE |    11.   352.     2 (0) | 00:00:01 |

    |   3.    INDEX SCAN FULL | SYS_C007567 |    11.       |     1 (0) | 00:00:01 |

    |*  4 |   JOIN TYPE.                 |   109.   216K |     4 (25) | 00:00:01 |

    |*  5 |    TABLE ACCESS FULL | T_OR_MON_ACTION |   106 S 216K |     3 (0) | 00:00:01 |

    ------------------------------------------------------------------------------------------------

    Information of predicates (identified by the operation identity card):

    ---------------------------------------------------

    2 - filter("TEST_TABLE".") (' SYS_NC00012$ ' IS NOT NULL)

    4 - access("SYS_ALIAS_0".") NESTED_TABLE_ID "=" TABLE_TEST. " ("' SYS_NC0000800009$ ')

    filter ("SYS_ALIAS_0". "NESTED_TABLE_ID"="TABLE_TEST" "." " ("SYS_NC0000800009$")

    5 - filter("SYS_ALIAS_0"." actionSubId» IS NOT NULL)

    Note

    -----

    -dynamic sample used for this survey (level = 2)

    Now, if it is still necessary, everything boils down to choosing a technique for index NULL values:

    -composite index with a column not zero or constant

    -FBI

    -bitmap image

    Choose the one that best fits your data, the selectivity and activity on the tables.

  • cost after and before creating indexes

    Hello
    sql_advisor gives me the following Plan explain before and after the creation of the index. But in the new explain plan CPU % is equal to zero.

    How is that possible?
    I understand the plan to explain it wrongly?
    1- Original                                                     
-----------                                                     
Plan hash value: 1851261115                                     
                                                                
-------------------------------------------------------------------------------------                                                                                                          
| Id  | Operation         | Name            | Rows  | Bytes | Cost (%CPU)| Time     |                                                                                                          
-------------------------------------------------------------------------------------                                                                                                          
|   0 | SELECT STATEMENT  |                 |     1 |    47 |     3   (0)| 00:00:01 |                                                                                                          
|*  1 |  TABLE ACCESS FULL| PS_CDM_TRANSFER |     1 |    47 |     3   (0)| 00:00:01 |                                                                                                          
-------------------------------------------------------------------------------------                                                                                                          
                                                                
Predicate Information (identified by operation id):             
---------------------------------------------------             
                                                                
   1 - filter("SERVERNAMERUN"=:1 AND "TRANSFERSTATUS"='2' AND   
              "TRANSFERATTEMPTCNT"<=:2 AND "NEXTTRANSFERDTTM"<=CAST(SYSTIMESTAMP(6) AS                                                                                                         
              TIMESTAMP))                                       
                                                                
2- Using New Indices                                            
--------------------                                            
Plan hash value: 3796702440                                     
                                                                
-----------------------------------------------------------------------------------------------                                                                                                
| Id  | Operation                   | Name            | Rows  | Bytes | Cost (%CPU)| Time     |                                                                                                
-----------------------------------------------------------------------------------------------                                                                                                
|   0 | SELECT STATEMENT            |                 |     1 |    47 |     0   (0)| 00:00:01 |                                                                                                
|*  1 |  TABLE ACCESS BY INDEX ROWID| PS_CDM_TRANSFER |     1 |    47 |     0   (0)| 00:00:01 |                                                                                                
|*  2 |   INDEX RANGE SCAN          | IDX$$_02420001  |     1 |       |     0   (0)| 00:00:01 |                                                                                                
-----------------------------------------------------------------------------------------------                                                                                                
                                                                
Predicate Information (identified by operation id):             
---------------------------------------------------             
                                                                
   1 - filter("SERVERNAMERUN"=:1 AND "TRANSFERSTATUS"='2' AND "TRANSFERATTEMPTCNT"<=:2)                                                             
   2 - acce...  
    Thank you and best regards.

    Ok.

  • Creating Index on another table in schema stored in my table

    Hello
    I want to create indexes on a table column that is in another schema of my schema and index will be stored in my diagram.

    ex: the current user 'hr '.
    SQL > create index idx1 on scott.emp (eno);

    Does the above query?

    Thank you
    Sri 
    SQL> conn
Enter user-name: hr@****
Enter password:
Connected.
SQL> create index ndx on scott.emp(sal);

Index created.

SQL> show user
USER is "HR"

SQL> select index_name from user_indexes where index_name = 'NDX';

INDEX_NAME
------------------------------
NDX

  • Table exists but still error: ORA-00942, isn't able to create indexes: Help

    It's my script... the table FLASH_SALES_BY_STORE_AND_HOUR exist in my database, so why I get the error message.
    ERROR on line 1:
    ORA-00942: table or view does not exist



    Here is my script.

    ASK for IDX_SALES_STORE_DEL

    CREATE INDEX IDX_SALES_STORE_DEL ON FLASH_SALES_BY_STORE_AND_HOUR (STORE_ID, TRUNC (LOCAL_DATE))
    TABLESPACE 'FLASH '.
    STORAGE
    (
    DEFAULT USER_TABLES
    )
    /

    QUICK creation IDX_SALES_STORE_VIEWexit


    CREATE INDEX IDX_SALES_STORE_VIEW ON FLASH_SALES_BY_STORE_AND_HOUR (STORE_ID, TRUNC (LOCAL_DATE), DEPARTMENT)
    TABLESPACE 'FLASH '.
    STORAGE
    (
    DEFAULT USER_TABLES
    )
    /

    Please, re - run the script as the user who owns the table...

    Otherwise, add the schema name before the name of the index (if not index will be created under SYS) and table name (since you missed the creation of synonym).

    HTH,
    Thierry

  • How to create indexes on the nested table.

    Hi all
    I held the syntax to create indexes on the nested table.

    I found below synta but when I try it with my table it gives me error

    CREATE UNIQUE INDEX indx_name
    ON nestedtablestore (NESTED_TABLE_ID, id);

    What is here NESTED_TABLE_ID & ID

    They are virtual your nested table

    Here is an example.

    create or replace type obj as object (no integer, address varchar2(100))
/
create or replace type tbl as table of obj
/
create table test_tbl (id integer, name varchar2(100), address tbl) nested table address store as address_nt
/
create unique index address_no_idx on address_nt (no, address)
/

    Published by: Karthick_Arp on November 23, 2010 01:41

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