go to link Abaixo vou exemplificar o uso desta feature:
https://iberomedia.com/blog-inbound-marketing/pymafgxhttps://londonorienteering.co.uk/2023/11/mjqch3k27hi Primeiramente iremos criar e popular uma tabela e realizar a criação do índice invisible, para que possamos realizar os testes com o uso da feature invisible index.
sourcesee url SQL> conn lamim/lamim SQL> create table tst_invisible_ix ( Connected. SQL> numero number ); SQL> BEGIN 2 3 Table created. INSERT INTO tst_invisible_ix VALUES (i); FOR i IN 1 .. 10000 LOOP END LOOP; COMMIT; PL/SQL procedure successfully completed. END; / 2 3 4 5 6 7 SQL> SQL> SQL>
https://deepblue.com/7qvb6h4 Antes de efetivamente realizar os testes, irei realizar uma coleta de estatística da tabela recém criada.
https://londonorienteering.co.uk/2023/11/6zdh9pul5https://mybeautybunny.com/bu6dgl9ero SQL> EXEC DBMS_STATS.gather_table_stats(USER, 'tst_invisible_ix', cascade=> TRUE); PL/SQL procedure successfully completed.
https://vaidosaefeminina.com/index.php/atbe9tnq Agora vamos validar o comportamento do plano de execução com e sem um índice em modo invisible.
https://naturallyequine.com/2023/11/ropjajsBuy Generic Diazepam 10Mg SQL> show parameter invisible; NAME TYPE VALUE ------------------------------------ ----------- ------------------------------ optimizer_use_invisible_indexes boolean FALSE SQL> select * from tst_invisible_ix where numero=123; NUMERO ---------- 123 Execution Plan ---------------------------------------------------------- Plan hash value: 978504830 -------------------------------------------------------------------------------------- | Id | Operation | Name | Rows | Bytes | Cost (%CPU)| Time | -------------------------------------------------------------------------------------- | 0 | SELECT STATEMENT | | 1 | 4 | 6 (0)| 00:00:01 | |* 1 | TABLE ACCESS FULL| TST_INVISIBLE_IX | 1 | 4 | 6 (0)| 00:00:01 | -------------------------------------------------------------------------------------- Predicate Information (identified by operation id): --------------------------------------------------- 1 - filter("NUMERO"=123) Statistics ---------------------------------------------------------- 1 recursive calls 0 db block gets 23 consistent gets 0 physical reads 0 redo size 525 bytes sent via SQL*Net to client 524 bytes received via SQL*Net from client 2 SQL*Net roundtrips to/from client 0 sorts (memory) 0 sorts (disk) 1 rows processed SQL>
https://melissasmissteak.com/38ct5hbrpa No exemplo acima é possível perceber que a consulta realiza um acesso full a tabela e não utiliza o índice criado com o invisible. Para testarmos a utilização do índice, podemos usar um hint na query ou alterar o parâmetro optimizer_use_invisible_indexes a nível de sessão, evitando assim que o índice impacte em outros processos e/ou aplicações.
click herehttps://makerversity.org/uwxtum4gn SQL> select * from tst_invisible_ix where numero=123; NUMERO ---------- 123 Execution Plan ---------------------------------------------------------- Plan hash value: 1674343203 ------------------------------------------------------------------------------------------ | Id | Operation | Name | Rows | Bytes | Cost (%CPU)| Time | ------------------------------------------------------------------------------------------ | 0 | SELECT STATEMENT | | 1 | 4 | 1 (0)| 00:00:01 | |* 1 | INDEX RANGE SCAN| IX_TST_INVISIBLE_IX01 | 1 | 4 | 1 (0)| 00:00:01 | ------------------------------------------------------------------------------------------ Predicate Information (identified by operation id): --------------------------------------------------- 1 - access("NUMERO"=123) Statistics ---------------------------------------------------------- 1 recursive calls 0 db block gets 3 consistent gets 0 physical reads 0 redo size 525 bytes sent via SQL*Net to client 524 bytes received via SQL*Net from client 2 SQL*Net roundtrips to/from client 0 sorts (memory) 0 sorts (disk) 1 rows processed
Buy Diazepam 10Mg India SQL> conn lamim/lamim Connected. SQL> alter index LAMIM.IX_TST_INVISIBLE_IX01 visible; Index altered. SQL> set autotrace on SQL> select * from lamim.tst_invisible_ix where numero=123; NUMERO ---------- 123 Execution Plan ---------------------------------------------------------- Plan hash value: 1674343203 ------------------------------------------------------------------------------------------ | Id | Operation | Name | Rows | Bytes | Cost (%CPU)| Time | ------------------------------------------------------------------------------------------ | 0 | SELECT STATEMENT | | 1 | 4 | 1 (0)| 00:00:01 | |* 1 | INDEX RANGE SCAN| IX_TST_INVISIBLE_IX01 | 1 | 4 | 1 (0)| 00:00:01 | ------------------------------------------------------------------------------------------ Predicate Information (identified by operation id): --------------------------------------------------- 1 - access("NUMERO"=123) Statistics ---------------------------------------------------------- 24 recursive calls 0 db block gets 35 consistent gets 0 physical reads 0 redo size 525 bytes sent via SQL*Net to client 524 bytes received via SQL*Net from client 2 SQL*Net roundtrips to/from client 6 sorts (memory) 0 sorts (disk) 1 rows processed
https://iberomedia.com/blog-inbound-marketing/e0yoyzb Afim de validar se um índice está visivel ou invisível, podemos consultar a coluna visibility da dba/user_indexes.
https://vaidosaefeminina.com/index.php/2oowolaBuy Diazepam Legally Online SQL> select index_name, visibility from dba_indexes where index_name='IX_TST_INVISIBLE_IX01'; INDEX_NAME VISIBILIT ------------------------------ --------- IX_TST_INVISIBLE_IX01 VISIBLE
Autor: Jhonata Lamim
https://iberomedia.com/blog-inbound-marketing/87d57gt
Buy Valium Europe MBA em Banco de Dados Oracle, formado pelo Centro Universitário de Araraquara (UNIARA), graduado em Sistemas de Informação pelo Centro Universitário de Brusque (UNIFEBE).
https://melissasmissteak.com/0cbxi0so8https://vilarriba.com/2023/11/06/ttwftn1b Atua com Banco de Dados Oracle desde Junho de 2010. Atualmente é DBA Senior na Exímio Soluções em TI (www.eximioti.com.br)
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Performance e Tuning;
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EM database/grid/cloud control 12c/13c;
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Standby database / Oracle Data Guard;
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DBA Oracle, Outsourcing – Marfrig Group – Set/2013 – Abr/2018
DBA Oracle, Outsourcing – Grupo Notre Dame – Intermédica – Mar/2017 – Abr/2018
DBA Oralce, Outsourcing – Hospital Beneficiência Portuguesa de São Paulo – Set/2015 – Abr/2018
DBA Oracle, Outsourcing – Fundação São Francisco Xavier – Set/2015 – Fev/2017
DBA Oracle, Outsourcing – Unimed Grande Florianopolis – Set/2014 – Jul/2016
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DBA Oracle, Outsourcing – Santa Casa de Misericórdia de Porto Alegre – 2013
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OCS 12C – Oracle Database 12c Certified Implementation Specialist
OCE 11G – Oracle Database 11g: Performance Tuning
OCA 11G – Oracle Certified Associate Administrator
OCP 11G/12C – Oracle Certified Professional Administrator
OCS 11G – Oracle Certified Specialist
OPNCS 11G – Oracle Partner Network Certified Specialist
OCS – Oracle Linux 6 Implementation Essentials
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