Database Administrator

Summary of common Postgresql ALTER statements, postgresqlalter Postgresql version: psql (9.3.4) 1. Add a columnCopy codeThe Code is as follows:Alter table table_name ADD column_name datatype;2. delete a columnCopy codeThe Code is as follows:Alter

Traverse all tables in the database and update the values of datetime columns.Declare @ tablename nvarchar (80)Declare @ cloumn nvarchar (80)Declare @ SQL nvarchar (400)Declare c1 cursor scrollSelect table_name, column_name from

Oracle sequence reset, oracle Sequence Question 1: How to reset the oracle Sequence After the oracle sequence is created, if you want to reset the sequence from 0 to 1, you can use the following stored procedure: Create or replaceprocedure

MySQL starts multiple instances and MySQL starts instances.Database Configuration Generate a database file set in the mysql main directory mkdir data_3307mkdir data_3308mkdir data_3309 Configure the database in the mysql main

Error accessing PRODUCT_USER_PROFILE troubleshooting, productprofile -- The following problem occurs when the password is changed. The problem has been solved after searching for related problems.-- The reason is that the script @ $

Detailed description of the Redis configuration file, for 2.6.3 -- 2.6.7, redis2.6.3 -- 2.6.7 Detailed description of the Redis configuration file, for 2.6.3 -- 2.6.7# Note on units: when memory size is needed, it is possible to specify # It in the

Mysql. h cannot be found in linux (mysql. h cannot be connected), and linuxmysql. hWrite a C language program connect1.c to establish a connection with the MySQL database. On the command line, enter: gcc connect1.c-o connect1.exe-I/usr/include/mysql-

SQL high-performance Stored Procedure paging and SQL stored procedure Paging USE [Lyjjr] GO/****** Object: StoredProcedure [dbo]. [P_ViewPage] Script Date: 05/29/2015 17:18:56 ******/SET ANSI_NULLS ONGOSET QUOTED_IDENTIFIER ongo alter proc [dbo]. [P_

SQL Study Notes (21) ----------- triggers and SQL triggers Trigger: monitors a situation and triggers an operation. Four elements of trigger creation Syntax: 1. monitoring location (table) 2. monitoring event (insert/update/delete) 3. trigger time

Datazen Map ChartZookeeper This article mainly introduces Datazen's support for map charts. Here you can see the types of map charts currently supported by Datazen and their own map data.   Map charts under Datazen are of the same type as other

How to convert a relational data table to an hbase data table First, we need to increase the number of data tables in the relational database from vertical extension to horizontal extension of the HBase data table" I. Hbase Storage Structure A)

Oracle & mysql Log information, oracle Official WebsitePreface The log information here refers to the log information used to perform command operations on the command line.Oracle1. Import and Export: imp omjx/ppet1205 @ xforcl full = y file = full

Hibernate Learning (query), hibernate Learning ( Data Query is a highlight of hibernate. hibernate provides a variety of query methods for programmers, including the following:1. hibernate language query, that is, the hql query we need to talk

Linux lsb_release command, linuxlsb_release About the lsb_release command in linux [root@lei1 ~]# lsb_release -aLSB Version: :core-4.0-amd64:core-4.0-noarch:graphics-4.0-amd64:graphics-4.0-noarch:printing-4.0-amd64:printing-4.0-noarchDistributor

Redis data type: SET type; redis data type: set Web programmer blog: http://blog.csdn.net/thinkercode Set Type-Features Set is a set. It is similar to the set concept in our mathematics. It adds and deletes elements to a set, and performs

Scenario and processing method of ora-01653 tablespace expansion failure, ora-01653 Processing Method Process of generating ora-01653 tablespace expansion failure: DBF is placed on the E disk and the E disk has only 200 M remaining. -- 1. Create a

MySQL (2) ---------- storage engine, mysql ---------- What is the storage engine?Data in MySQL is stored in files (or memory) using different technologies. Each of these technologies uses different storage mechanisms, indexing techniques, locking

Understanding of listening for static registration configuration, listening for static Configuration   Global_dbname In the Listener. ora configuration file can be configured at will; SID_LIST_LISTENER = (SID_LIST = (SID_DESC = (GLOBAL_DBNAME = ora1

Use API for shipment confirmation and run Interface Trip Stop, apiinterface DECLARE p_sales_order NUMBER: = 1506764295; p_line_number NUMBER: = 1.1; p_org_id NUMBER: = 121; l_shipped_quantity NUMBER: = 1; p_api_version_number NUMBER: = 1.0; init_msg_

One SQL Optimization for Mysql (1) and one SQL Optimization for mysqlWhen the development reaction is used for stress testing, the concurrency does not go up, and some SQL statements are executed very slowly, so explain:MariaDB [db_vip]>MariaDB