Database Administrator

Obtain SQL statement execution plans from the most authoritative Oracle Database This document is compiled and summarized based on relevant information. It mainly describes the most authoritative and correct methods and steps for obtaining SQL

How to scale up a MySQL shared tablespace 1. What are shared and exclusive tablespaces? Shared and exclusive tablespaces are used for data storage. Shared tablespace: All table data of a database is stored in one file. By default, the file path of

Basic PL/SQL programming introduction and practices Basic PL/SQL programming introduction and practices 1. Start (p1 ~ P2)2. Background (p3)3. features and advantages (p4 ~ P5)4. Instructions for use (p6)5. syntax structure (p7)6. Naming reference

Description of MySQL Data Type decimal (m, d) For instructions on MySQL Data Type decimal (m, d), perform the following test on your own: Create table decimal_test (Id int auto_increment PRIMARY key,Score decimal (999.99) -- value range:-999.99); --

For the past two or three years, Oracle has been selling Oracle Enterprise Linux, a Red Hat Enterprise Linux-based release that is supported by Oracle, But Oracle's Linux director said there is a major difference between the two, therefore, Oracle

I. Preparations before installing Oracle in Red Hat Enterprise Linux 5: Download files Oracle Database 10g Release 2 (10.2.0.1) Software Decompress the file Command to decompress the file: Unzip 10201_database_linux32.zip The decompressed folder may

Account alias receiving transaction processing, account alias Transaction ProcessingZookeeper -- Account alias receptionSELECT mtl_material_transactions_s.nextvalINTO l_mtl_txn_itf_rec.transaction_interface_idFROM

WAS cluster series (7): Build a cluster: Step 5: Install WAS patch and cluster was Check the "Task Manager" before installation. If a java Process exists, disable it and disable WAS services. Find the WAS Update Wizard startup item in the Start Menu,

SQL statement-case when then else end, SQL-case Output the following results based on the preceding table information: The following are the database and table structure data: create table DeptSales(deptID int,SubjMonth int ,sales int ,deptname

Full-text search engine Elasticsearch getting started tutorial, Full-text search is the most common requirement. Open-source Elasticsearch (hereinafter referred to as Elastic) is the first choice for full-text search engines. It can quickly store,

Vacuum full locks the table and is very inefficient. In practice, vacuum cannot be used to narrow down the pg_class, resulting in a long downtime.In fact, the simplest way to implement vacuum full is to copy a table again, create table B as select *

"Unable to upgrade database... because SQL Server of this version does not support non-release version of this database (539)" solution, sql539 When you use SQL2012 to append a database, the following error is reported: "You cannot upgrade the

SQL query beginner's Guide Reading Notes (2) Creating SQL queries, beginner's guide SQL PARTII: SQL Basics CHAPTER 4 Creating a Simple Query This section describes how to create an SQL statement: "Request/Translation/CleanUp/SQL"   The SELECT

Mysql varchar sorting CAST, CONVERT function type conversion, varcharconvert When creating a table on your own, you should create a field type as varchar (2). In fact, it should be set as integer (2). But today, we found a Sorting Problem in the

The server Load balancer of the Oracle RAC server distributes new connection requests to the node with the smallest load based on the number of connection loads of each node in the RAC. When the database is running, the PMON process of each node in

SQLite tutorial (5): database and transaction, sqlite tutorial I. Attach database: The attach database statement adds another DATABASE file to the current connection. If the file name is ": memory:", we can regard it as a memory DATABASE, and the

[DAO] simple document of billing system database design, dao Billing System DatabaseDatabase Design Documents Database Design Documents, SQL statements for table creation. 1) account Id number (9) PK account ID Login_name varchar2 (20) not null user

NoSQL has now become a very popular topic in the IT industry. In this article, we will introduce you to the basic knowledge of CouchDB, a member of NoSQL, and take you into the world of NoSQL.   What is NoSQL? NoSQL (short for not only SQL, also

Install the 32-bit oracle software in 64-bit linuxIn some cases, sometimes we need to install 32 oracle software on a 64-bit system (for example, the customer's abnormal requirements ). Although theoretically, this method is feasible, but in the

Fault symptom: 1. Computers are running slowly and cannot be manipulated. 2. The web programs supported by the data source are down, and the Error exposed is: Connection timeout. 3. There is no problem connecting to the database locally, but the