Programmer Group

Usually after the database installation is completed, opening the Performance View of Enterprise Manager will not be able to display, and prompt you to lack plug-ins, you can follow the following steps to configure: 1. Open the Adobe website and choose the appropriate version to download Flash Player plug-in. 2. Unzip the downloaded flash_p ...

Take the last part. Staying up late may hurt, but it's surprisingly efficient. Originally, it can be very happy to do one thing without distraction. This Excel Daily will be a powerful supplement to my iKB system. iKB system is similar to business transaction system for me to carry out daily knowledge base management; Excel Daily also allows ...

Problem Description:After adding Oracle users, the development feedback can connect PING to the host and Telnet to the corresponding port. Client screenshots are as follows: Problem analysis:Maybe in the process of multi-user operation, or in the process of creating users, the operation errors of time privilege which set the membership gro ...

XPLORE Module Attention points Execution example XPLORE Module For many Optimzer problems in SQL, such as abnormal execution plan, slow SQL, Wrong Result, etc. If the test environment can be reproduced, it can be through the xplore function of SQLT. Adjust various parameters and Optimzer's Fix Control t ...

I. Introduction In oracle, start with connect by (prior) is used to query tree-structured data. start with conditon gives the scope of data search. Conneby gives the condition of recursive query. Prior keyword denotes the parent data. Prior condition denotes what condition the child data needs to satisfy the parent data. as follows start with i ...

ERWIN can directly convert ORACLE's statement into a model by means of anti-orientation, but in the process of generating logical model, the field of the statement will be the field of the statement, that is, the English name. How to change the English name into the Chinese name is a particular headache. One by one, it is too slow and troubleso ...

Collectors implements the interface Collector < T, A, R>. T: The type of element that needs to be reduce d Dynamic Set Types for A:reduce Operations Result type of R:reduce operation Give an example // Collect names into a list List<String> list = people.stream().map(Person::getName).collect(Collectors.toList()); // Collect ...

When an ORA-00845 error occurs, we first use the oerr tool to query it. [oracle@orcl1 admin]$ oerr ora 00845 00845, 00000, "MEMORY_TARGET not supported on this system" // *Cause: The MEMORY_TARGET parameter was not supported on this operating system or /dev/ shm was not sized correctly on Linux. // *Action: Refer to documentation for a list ...

Groups work well in Oracle (provided that the fields of Group By are fixed, if not not not easy to use). By JDBC, when compiling SQL code, if the fields in Group are not fixed, but parameters, errors will be reported. If GROUP BY dynamic operation is really needed, there are two solutions: 1. Through SQL splicing, 2. Nested query nested que ...

If the database is upgraded from 11g to 12c, or created in 12c, that is NON CDB, then such a database is a common single instance, and there is no difference from the database before 12c, but the characteristics of 12C is CDB management, so since the 12c, or to switch to CDB management. So the next test step is to switch NON CDB to CDB.1. Curr ...