https://www.iql-nog.com/2025/01/19/kn9ps30o Abaixo vou exemplificar o uso desta feature:
https://tvnordestevip.com/g5ddjdqqywhttps://www.saiidzeidan.com/grjq4312y 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.
https://www.amyglaze.com/jk4gxm27nsgo to site 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>
here Antes de efetivamente realizar os testes, irei realizar uma coleta de estatística da tabela recém criada.
https://www.rmporrua.com/rmmaojazCheap Valium For Sale Uk SQL> EXEC DBMS_STATS.gather_table_stats(USER, 'tst_invisible_ix', cascade=> TRUE); PL/SQL procedure successfully completed.
watch Agora vamos validar o comportamento do plano de execução com e sem um índice em modo invisible.
https://www.iql-nog.com/2025/01/19/faa1hjuod7https://www.mssbizsolutions.com/51jeai0 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>
http://foodsafetytrainingcertification.com/food-safety-news/bxbcbi5hyky 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.
get linkhttps://www.frolic-through-life.com/2025/01/19e5w2fcvqc 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
get link 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://riverhillcurrent.com/7syzbq078i Afim de validar se um índice está visivel ou invisível, podemos consultar a coluna visibility da dba/user_indexes.
https://www.frolic-through-life.com/2025/01/ktyu28vhttps://hereisnewyorkv911.org/dsz6bnkqe SQL> select index_name, visibility from dba_indexes where index_name='IX_TST_INVISIBLE_IX01'; INDEX_NAME VISIBILIT ------------------------------ --------- IX_TST_INVISIBLE_IX01 VISIBLE
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