Database Administrator

How to handle Oracle lock wait Management of lock wait is a problem that database administrators encounter in their daily work. Generally, large ERP lock wait processes are relatively small, there will be a relatively large number of lock waits for

Oracle ORA-02020: excessive database connections in use solution steps Note: Not long ago, developers reported ORA-02020 error during storage compilation. The following is the solution step. Error message: Error: or a-04052: An Error occurred while

10 of the best MySQL database Client GUI management tools MySQL has become the most popular open-source database in the past because of its high performance, low cost, and good reliability. Therefore, MySQL is widely used in small and medium

Advanced oracle query and advanced Query 1. eliminate duplicate rowsIf several rows are the same in the Oracle query results, you can use DISTINCT to remove duplicate rows. Code Demonstration: Remove duplicate rows in DISTINCT SQL> SELECT

Oracle single row subquery, oracle single row subquery Subqueries can contain SELECT statements in SELECT, UPDATE, and DELETE statements. The internal SELECT statement result can be part of the Condition Clause in an external statement,It can also

Abnormal TXT and logslaveupdates Recently, it was verified that a specific table was copied from the slave database to another master database for adjustment. If log-slave-updates is not configured, the table cannot be synchronized normally. The

Oracle performance optimization operations: Summary, oracle Performance Optimization These articles about oracle performance optimization can be used in combination with each other. In addition, various methods are closely related to each other.

Updates information in the database.Author:Www.gudianxiaoshuo.comThis article is organized by the Code Assistant Software and released content is irrelevant to this software.More comfortable reading, more comfortable writing, and easier

ACID, yieldThere are actually a lot of details... 1. What is ACID? The first thing to note is that in the IT field, many terms have different semantics in different contexts. For example, some products claim to support "100% ACID" and "strong

How to remotely connect oracle11G and ploracle11g from a virtual machine through PL/SQL Environment requirements: 1. win8.1 Operating System 2. Download instantclient_10_2 must be 32-bit:

What is the difference between varchar and nvarchar in the database? varcharnvarchar Differences between varchar and nvarchar in Databases 1. varchar is stored in bytes, while nvarchar is stored in characters (two bytes. That is to say, varchar

SQL statement summary [update], SQL statements are constantly updated 1: query the number of tables in the database dbName. Select count (*) from information_schema.tables where table_schema = 'dbname '; 2: Merge tables based on a field Select id,

How to execute SQL and oraclesql in the background of Oracle in linux Scenario: If you want to collect statistics about the database, it may take about 7 to 8 hours, and you want to turn off your computer and run it on the server, use the following

PostgreSQL common SQL, pgsql 1. view the current database connection SELECT pg_stat_get_backend_pid(s.backendid) AS procpid, pg_stat_get_backend_activity(s.backendid) AS current_query FROM (SELECT pg_stat_get_backend_idset() AS backendid)

Java. SQL. SQLException: unable to read more data from the socket (when mybatis is inserted), mybatis It appears today when you perform batch insert of mybatis. Java. SQL. SQLException: An error occurred while reading more data from the socket.

[Problem description] ImportError No module named MySQLdb problem solving, importerrormysqldb 1. Check whether the MySQLdb module has been installed. Go to the python command line and enter import MySQLdb. If no error is reported, it indicates that

Demonstration of DB Query Analyzer 6.03 Installation and Running on Microsoft Windows 8, Demonstration of DB Query Analyzer 6.03 Installation and Running on Microsoft Windows 8 Ma Genfeng (Guangdong Unitoll Services ininitialized ated, Guangzhou 5103

In Oracle, the field content format specified in the data table is converted from pinyin to numbers. oracle cursor Application Scenario: Convert [sannanyinv] to [3 male and 1 female] In the NNDP field of the data table TB_USER. Main Script: A cursor

SQLCE3.5 database transaction processing, sqlce3.5 Database Transaction By chance, I learned from MSDN today (I always thought that SQLCE does not support transactions ). I believe that many WINCE developers, like me, directly use sqlce. excute

Sysobjects table and mssqlsysobjects table in mssql The database (constraints, default values, logs, rules, stored procedures, etc.) can be found in the sysobjects table. Column name Data Type Description Name Sysname