Y at - it a similar index in MySQL: CREATE INDEX part_of_customer customer WE (name (10));

Hello!

There is a column of type long varchar (3000 characters) in our user table to store the e-mail address of the user or a list of email addresses.

Most of the lines contain only a single address.

I want to add an index on this column, because there are many research in this column with a certain email address.

Y at - it a similar syntax that would allow me to create an index using only the part of the column as the index key as it is in MySQL?

This is the syntax of MySQL guides, I found:

Customer of CREATE INDEX part_of_name ON (name (10));

so in our table, it would be

CREATE INDEX in_partial_email on dtuser (email (150));

This works well in MySQL.

In Oracle if I try to index the entire column I'll end with

ORA-01450: exceeded maximum key length

I would be happy for any information on this topic!

BR saturation

Please see the example:

create table ttt (col1 varchar2 (2000));

create index ttt_idx on ttt (substr (col1, 1, 20));

going to index on the first 20 characters of col1.

Tags: Database

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    Caused by: java.io.IOException: could find the Instance of the component in the register number: http://localhost:8500 / StagingCRS-dimvals /? wsdl

    at com.endeca.itl.util.UrlUtils.ping(UrlUtils.java:195)

    at com.endeca.itl.util.UrlUtils.ping(UrlUtils.java:147)

    at com.endeca.itl.service.ServiceLocator.getService(ServiceLocator.java:215)

    ... more than 17

    Thanks for any help,

    Andreas

    Thanks for the information, it looks like the EAC application name that was created and the name of the application SimpleIndexAdmin trying to talk are different.

    initialize_services.sh created dimval record store with the name of CRS-dimvals however your application tries to talk to StagingCRS-dimvals. EHR you can correct the short Atg configs application name, or you can create another application with the name StagingCRS

    Thank you very much

    Vaibhav

  • ALTER INDEX with parallel and Nologging

    I want to move some indexes to a different tablespace. For this I use the SQL below:

    XYZ ALTER INDEX REBUILD TABLESPACE TS_INDX01 NOLOGGING PARALLEL 8;

    I use NOLOGGING and PARALLEL thinking it will speed up the process of movement. But now I'm confused because I think that this will change the index property, as in, when we create an index specify us certain parallels and logging properties.

    So I want to understand:

    1. the SQL above to change the properties of the index?

    2. How can I check the existing nologging and parallel properties of an index?

    SQL> create table temp (no integer, name varchar2(100));

Table created.

SQL> create index temp_idx on temp(no);

Index created.

SQL> select degree, logging from user_indexes where index_name = 'TEMP_IDX';

DEGREE                                   LOG
---------------------------------------- ---
1                                        YES

SQL> drop index temp_idx;

Index dropped.

SQL> create index temp_idx on temp(no) nologging parallel 5;

Index created.

SQL> select degree, logging from user_indexes where index_name = 'TEMP_IDX';

DEGREE                                   LOG
---------------------------------------- ---
5                                        NO

SQL> alter index temp_idx parallel 1 logging
  2  ;

Index altered.

SQL> select degree, logging from user_indexes where index_name = 'TEMP_IDX';

DEGREE                                   LOG
---------------------------------------- ---
1                                        YES

  • Unused indexes

    create table big( id number, name varchar2(100));
insert into big(id, name) select rownum, object_name from all_objects;
create index big_index on big(id);






select count(*) from big;
1260398 




1.EXPLAIN PLAN FOR  
SELECT   ID  FROM big ORDER BY id; 


SELECT *  FROM TABLE(DBMS_XPLAN.DISPLAY); 


Plan hash value: 1222949096

-----------------------------------------------------------------------------------
| Id  | Operation          | Name | Rows  | Bytes |TempSpc| Cost (%CPU)| Time     |
-----------------------------------------------------------------------------------
|   0 | SELECT STATEMENT   |      |  1260K|  7385K|       |  5549   (2)| 00:01:07 |
|   1 |  SORT ORDER BY     |      |  1260K|  7385K|    14M|  5549   (2)| 00:01:07 |
|   2 |   TABLE ACCESS FULL| BIG  |  1260K|  7385K|       |  1444   (1)| 00:00:18 |
-----------------------------------------------------------------------------------




2. EXPLAIN PLAN FOR  
SELECT   *  FROM big ORDER BY id; 
Plan hash value: 1222949096

-----------------------------------------------------------------------------------
| Id  | Operation          | Name | Rows  | Bytes |TempSpc| Cost (%CPU)| Time     |
-----------------------------------------------------------------------------------
|   0 | SELECT STATEMENT   |      |  1260K|    30M|       | 10550   (1)| 00:02:07 |
|   1 |  SORT ORDER BY     |      |  1260K|    30M|    43M| 10550   (1)| 00:02:07 |
|   2 |   TABLE ACCESS FULL| BIG  |  1260K|    30M|       |  1445   (1)| 00:00:18 |
-----------------------------------------------------------------------------------




In why does the time increases to 2:07 for the second explain plan

    Why the time increases to 02:07 for the second plan to explain?

    Hello

    1. in comparing Oracle index as an index of a book where the index can occupy a few pages, how store Oracle index?

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    2. why the column must be NON NULL for indexes to use?

    Because the null entries are not stored in an index, if Oracle does not know that there may be NULL values, it can "use the index to be sure to find ALL values... Imagine a table T (col1 NUMBER, VARCHAR2(10 CHAR) NOT NULL, col2, col3,...) where col1 is NOT defined as "not null", and the table contains three lines:

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    Providing constraints (not null, unique, pk, fk, check) for the dictionary is not only good for the optimizer but also good to add quality control of data do not believe developers/suppliers of applications that tell you that the constraints are unnecessary, as the design of the application supports controls ;-)

    Best regards

    Bruno Vroman.

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