things basedonthat.8) dual = magic. dualisa one row table however having morethen1orlessthenoneisdangerous. You are updating the data dictionary. You should naturally expect very bad thingstohappen. 简单总结,意思如下:
6) the optimizer understands dual is a magic, special 1 row table. It stopped on the select * because there is to be one row in there. Its just the way it works. Hopefully you reset dual back to 1 row after your testing or you just totally broke your database! 7) like I said, ...
Licensing: PostgreSQL is distributed under the PostgreSQL License, a permissive open source license. In contrast, MySQL offers dual licensing options: the GNU General Public License (GPL) for open-source projects and a proprietary commercial license for other uses. Data types: PostgreSQL provides a ...
The SET_GLOBAL_PREFS procedure allows you to change the default values of the parameters used by the DBMS_STATS.GATHER_*_STATS procedures for any object in the database that does not have an existing table preference. All parameters default to the global setting unless there is a table ...
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...
Eg:- Select 1 from dual; returns 1 as there is only one record in dual. Select 1 from v$session; returns 7 1â s if there are 7 records on v$sessionHere is a table called TAB1 that has 3 rows.SQL> select * from tab1; ENO--- 101 102 103Now if I select ...
Table 1-1 provides an incomplete list of common high-risk ports for reference. Remote management service: Remote O&M is the daily work of enterprise IT O&M personnel. Most remote management services are the preferred target of attackers. Therefore, opening the corresponding port can be risky....
Using Message Queuing COM Components in Visual C++ and C Opening Local Queues Visual Basic Code Example: Retrieving MSMQQueueInfo.Authenticate MSMQ Glossary: M IFileOpenDialog Notifications Notifications Toolbar Controls MSMQQueueInfo.IsWorldReadable2 Visual Basic Code Example: Sending a Message Using a...
We also recommend you use the Microsoft Entra audit log to monitor for the Directory Management: Create Company event that signals a new tenant has been created by a user in your organization.To further protect your organization, Microsoft is now limiting this functionality to only paid customers...
Learn about what's new in the latest version Power BI Report Server. This article covers the major feature areas and is updated as new versions are released.