Database Administrator

Oracle 11g re-build the objects to be deleted by EM The re-built EM is required. The re-built EM is forced to stop due to some errors, such as the object already exists and the user already exists. In the end, the necessary conditions for creation

Oracle technical Q & Today, I talked to a senior Oracle expert about a lot of technical problems. He also came up with a few questions and asked me at random, I found that there are still a lot of dry goods in the seemingly simple questions. Many

Relationship between constraints and column attributes NULLABLE in Oracle 10 GB Conclusion: The columname type not null and check (columnname is not null) results are different. Therefore: 1. You do not need to manually match the NULLABLE attribute.

Oracle Rename and delete tablespaces You can modify the name of a table space as needed. Modifying the table space name does not affect the data in the table space. However, the system tablespace and sysaux names cannot be modified.The syntax for

Set the default tablespace in Oracle In Oracle, the user's default permanent tablespace is system, and the default temporary tablespace is temp. If all users use the default temporary tablespace, the system and temp tablespaces will undoubtedly be

Error Code: 1360, errorcode1360 1. Error description Query:DROP TRIGGER `t_sert_cs_approve`Error occured at:2015-04-12 13:37:32Line no.:1Error Code: 1360 - Trigger does not existQuery:ALTER TABLE `t_toot_erth_ssess`MODIFY COLUMN `id` int(20) NOT

06-SQLite update, delete, 06-sqliteupdateI. update syntax Update table name set list name = new value where list name = A Value 2. Update a column of data in a row 3. Update several columns of data in a row Iv. delete statement:

Database Tuning tutorial (5) Roles of indexes and types of indexes, tuning IndexesIii. Index In the previous chapter, we learned how to use explain to generate a query execution plan (QEP), so as to discover problems with the statement. Three

(7) design and use of mysql indexes and mysql index design Overview The distinct index is used to quickly find rows with a specific value in a column. If no index is used, MySQL must start with 1st records and read the entire table until related

Sqlyog writes the mysql stored procedure, sqlyogmysql Damn it, it's really strange to write a stored procedure fuck, such a simple thing. That is, the number of fucking spaces is less than the number of spaces. It's really troublesome. I spent half

Solve the problem that Mac OS 10.10 php cannot connect to mysql, 10.10 mysql There is no problem connecting php to the database. After upgrading to 10.10, the connection suddenly fails. This problem has been put on for a long time. Today, I suddenly

Mysql paging stored procedure and mysql Stored Procedure There is a lot of information about the mysql paging stored procedure on the Internet, but the content is similar. As a beginner, reference the mysql stored procedure as follows: DELIMITER $

The Application of Genetic Algorithm in the maze game, and the genetic algorithm in the maze My Data Mining Algorithm Library:Https://github.com/linyiqun/DataMiningAlgorithmMy Algorithm

Hummertimeseries DB Technical Architecture introduction, hummertimeseriesHummer Timeseries DB system architecture has the following main features: A. the Hummer Timeseries DB system adopts A layered modular design. The layers and modules are

Relational and structured databases, database structuringRelational What is a relational database? The foundation of relational databases is the relational model proposed in 1970. This model consists of three parts: relational data structure,

SQL stored procedure select rowscount and then insert, stored procedure rowscount The previous blog has not been written for nearly a year and a half. It is true that there are not many technical things to be written in the past year and a half.

Error while loading shared libraries: libevent-2.0.so.5: cannot open shared object file: No such fil, empty dobject Machine Environment [Vagrant @ localhost lib64] $ cat/etc/redhat-release CentOS release 6.4 (Final) [Vagrant @ localhost lib64] $

Truncate usage in oracle and oracletruncate usageTruncate in oracleSyntax: truncate table;You can use the truncate Statement (DDL language) to delete all records in a table. The truncate statement is usually much faster to delete data than to delete

Add the mysql path to the environment variable. 1. Open the terminal and enter: cd ~ Will enter ~ Folder 2. Enter touch. bash_profile. After you press enter to execute, 2. Enter open-e. bash_profile. This file will be opened in TextEdit (if

Oracle check constraints and oraclecheck ConstraintsA check constraint is a check constraint. When a check constraint is used, each input data is checked. Only records that meet the conditions are saved in the table, this ensures Data Validity and