The validationQuery was set to "select 1 from DUAL" (obviously) and apparently the connection pool defaults testOnBorrow and testOnReturn to true when a validation query is non-null. One further question that this brings up for me is whether or not I actually need to have a validation query, or if I can maybe get a performance boost by disabling it or at least reducing the frequency with which

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Select 1 from dual

X. (1 row). Got the product in 1 day!!! I was shocked by Flipkart's delivery speed! My Laptop is running much better than before. If you are looking into improving the boot 2019年8月15日 select rownum from ( SELECT 1 FROM dual UNION ALL SELECT 1 FROM SELECT d FROM dual model dimension BY (1 d) measures (1 m) 5 Nov 2020 4.2.1.

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20 Jul 2010 What is DUAL in Oracle? Dual is a table that is created by Oracle together with data dictionary. It consists of exactly one column named “dummy”,

The DUAL table has one column named DUMMY whose data type is VARCHAR2() and contains one row with a value X . SELECT * FROM dual;.

The validationQuery was set to “select 1 from DUAL” (obviously) and apparently the connection pool defaults testOnBorrow and testOnReturn to true when a validation query is non-null. One further question that this brings up for me is whether or not I actually need to have a validation query, or if I can maybe get a performance boost by disabling it or at least reducing the frequency with

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It did not evaluate the second expression (1… You can select from dual or from your own tables too, you can if you want. For me, I'll stick with dual because I know dual exists. I know it has at least 1 and at most 1 row. I know the optimizer knows all about dual and does the most efficient thing for me. The optimizer understands dual is a magic, special 1 row table. It stopped on the DUAL is a table with has exactly one row as the following SQL statement will show:. SELECT * FROM dual; Your dual2 table has no rows.
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Any ideas on what could be going on? Thanks, ht 2020-08-20 select 1 from dual; … doesn’t work!

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23 mars 2012 select 'a' code_famille, 'audio' libelle_famille from dual UNION ALL select 'v' , ' video' SELECT 1 FROM dual connect BY level <= 1000000.

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mysql> SELECT 1 + 1 FROM DUAL; -> 2 DUAL is purely for compatibility with some other database servers that require a FROM clause. MySQL does not require the clause if

SQL> commit;. Commit complete . SQL> select count(*) from dual 3 Mar 2008 Q. Mark for review Evaluate the SQL statement: SELECT ROUND(45.953, -1), TRUNC(45.936, 2) FROM dual; Which values are displayed?