OBJECT_NAM OBJECT_TYPE OWNER--- --- ---DUALTABLESYS DUAL SYNONYM PUBLIC 还有一个叫DUAL的public synonym,所以任意的用户都可以访问到DUAL了。 神奇的是,DUAL这货在实例是nomount的状态下也可以访问: [oracle@bogon~]$ sqlplus/assysdbaSQL*Plus:Release12.1.0.2.0ProductiononWedDec1008:00:152014Copyright (...
1.What is the dual table, what is its purpose. dual is just a convienence table. You don't need to use it, you can use anything you want. The advantage to dual is the optimizer understands dual is a special one row, one column table -- when you use it in queries, it uses thi...
SQL profile is a collection of additional statistical information stored in the data dictionary that helps the optimizer to generate the best plan for the query. SQL profile is managed through SQL_TUNE package of SQL tuning advisor. i.e when we run SQL tuning advisor against a query, The tun...
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Re: why does "select 1 from dual" work - what is the "1"? Hi,this is all explained in the documentation :"DUAL is a table automatically created by Oracle Database along with the data dictionary. DUAL is in the schema of the user SYS but is accessible by the na...
'Incorrect syntax near' error while executing dynamic sql 'INSERT EXEC' within a function did not work 'Sort' in exuction plan is showing more than 90 % cost, what to do? 'TRY_CONVERT' is not a recognized built-in function name 'VARCHAR' is not a recognized built-in function name. ...
Oracle in-memory dual-format数据库结合了基于行的buffer和基于列的内存压缩单元 (IMCU) 来一起处理 OLTP 和 OLAP 工作负载。IMCU 从buffer填充,changes会缓存在快照元数据单元 (SMU) 中。另一个例子是 SQL Server,它在 Hekaton 行引擎中的内存表上开发了列存储索引 (CSI),以实现实时分析处理。这种类型的 H...
Learn more in the detailed guide to SQL injection Key Compliance Regulations Related to Data Security Organizations handling sensitive data must comply with various data security regulations. These regulations help ensure that data is properly protected against breaches, unauthorized access, and misuse. He...
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i am migrating the oracle database into the sql server database. can any suggest the equivalent quires in sql server. SELECT TRUNC (TO_DATE('02-MAY-19'), 'IW') from dual; SELECT TRUNC (TO_DATE('02-MAY-19'), 'W') from dual; currently i am using the Microsoft SQL Server ...