*Starting in 11.2.0.2, Oracle Database can use function-based indexes to process queries without the function in the where clause. This happens in a special case where the function preserves the leading part of the indexed values. For example, trunc() or substr()....
Oracle stores information in memory caches and on disk. Memory access is much faster than disk access. Disk access (physical I/O) take a significant amount of time, compared with memory access, typically in the order of 10 milliseconds. Physical I/O also increases the CPU resources required,...
Your code self-documents the usage of this data structure: it should not and cannot change. A developer can’t later mistakenly change the data structure’s value. Get Oracle PL/SQL Best Practices now with the O’Reilly learning platform. O’Reilly members experience books, live events, ...
2. In this section you can find several samples, showing the functionality of UTL_MAIL. Before attempting to run them be sure that you have created the UTL_MAIL package by running the following script under SYS schema. @$ORACLE_HOME/rdbms/admin/utlmail.sql @$ORACLE_HOME/rdbms/admin/prvtma...
Oracle PL/SQL 1 2 3 SELECT... FROMsales WHERETRUNC(sale_date)=TRUNC(sysdate-INTERVAL'1'DAY) 这个时候如果有sale_date的索引的话,是不会使用的。原因在上文 FBI 已经介绍个过了,函数对于数据库来说是个黑盒,不同的函数以为着不同的索引。
1.select trunc(sysdate) from dual --2011-3-18 今天的日期为2011-3-18 2.select trunc(sysdate, 'mm') from dual --2011-3-1 返回当月第一天. 3.select trunc(sysdate,'yy') from dual --2011-1-1 返回当年第一天 4.select trunc(sysdate,'dd') from dual --2011-3-18 返回当前年月日 ...
Learn about the correlation between the Oracle GoldenGate commands and parameters that are run when you select the various options in the Properties Inspector.
When I replace the variable with the first variable in the command line, i.e. $Aif_Stg_Sid, that variable comes up fine: i.e. if the command line becomes: command: echo "$Aif_Stg_Sid PARTITION_MANAGER.TRUNC_MTHLY_PARTN_BY_DT_PRC\(\'ATTRIBUTABLE_PREMIUM\'\,\'$Aif_Stg_Sid\'\) ...
The build-in Oracle function (STATS_CROSSTAB) can give us the value of Chi-squared (CHISQ_OBS) , the degree of freedom (CHISQ_DF), and the statistical significance (CHISQ_SIG). What we are interested in is the statistical significance. A number less that 0.05 indicates that the data is...
moving to the following instead results in a huge speed improvement column >= date_trunc('day',now()) and column < date_trunc('day',now() + '1 day') currently our read-only replica cries with the following error because the cast causes the query to run too long ...