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A concise course in Scala Directory Variable declaration Function Package Package Data String Control process Pattern matching Object-oriented Generic type Annotations Implicit Empty Object Nil,null,null,unit,nothing,none Scala is a

Server Rich data types Richer-Types 1, varchar (max), nvarchar (max), and varbinary (max) data types can hold up to 2GB of data and can replace text, ntext, or image data types.CREATE TABLE myTable(ID INT,Content VARCHAR (MAX)) 2. XML data typeXML

Introduced Applications typically use data caching to improve performance, especially for applications that are heavily used for read-only transactions. These applications update the database directly when the data is changed. The problem is that

1) The Qbytearray class provides an array of [bytes]. The Qbytearray can store both the original bytes (including ' the ' + ') and can be used to store a 8-bit string that ends with '/' on the Convention. . Because the Qbytearray package has a lot

1) The Qbytearray class provides an array of [bytes]. The Qbytearray can store both the original bytes (including ' the ' + ') and can be used to store a 8-bit string that ends with '/' on the Convention. . Because the Qbytearray package has a lot

Statspack 10 items that must be viewed in the output result 1, load between files (load profile) 2, instance efficiency click Rate (Instance efficiency hit ratios) 3, the first 5 waiting events (Top 5) 4, Waiting for events (wait event) 5.

Replication Redis supports a simple and easy-to-use master-slave replication (Master-slave replication) feature that allows the slave server (slave server) to be an exact replica of the master server.Here are a few important aspects of the Redis

1. Introduction to CursorsCursors are a method of processing data that is used primarily in stored procedures, triggers, and Transact-SQL scripts. The SELECT statement returns a result set that the cursor can fetch one record at a time from the

The day before yesterday to customers to do a database server adjustment, the previous one host abandoned, one from the library to promote the main, and then new to join other slave, here to record the operation steps:First, the old master library

MongoDB's library-level lockMongoDB is currently the most popular NoSQL database, with its natural document-type data structures, flexible data patterns, and easy-to-use horizontal scaling capabilities that have been favored by many developers. But

First, Introduction to Stored ProceduresSQL Server's stored procedure is a named collection of transacation-sql statements stored on the server, a way to encapsulate repetitive work that supports user-declared variables, conditional executions, and

MySQL stored procedure's Affairs ChapterFour characteristics of the transaction:Acid:atomic (atomicity), consistent (consistency), Isolated (Independence), durable (persistence)MySQL's transactional support is not tied to the MySQL server itself,

Deep understanding of Oracle RAC 12cJump to: Navigation, search Directory 1 Overview 2 Cluster parts management and fault diagnosis 3 Operational Practices 4 new Features 5 Storage and ASM 6

St-link in the Win8 on the support is not very good, it is said that because St-link the hardware does not have a digital signature, Win8 mandatory hardware must have a digital signature. Although the usual still use of pirated Jlink a little more,

Graduation to now calculate to do more than 3 years of service development, after graduation very little time to think in the school as can spare some spare time to a summary of knowledge, to now is also a summary of some key knowledge, today take

Source: The transaction support reproduced in MySQL is not tied to the MySQL server itself, but is related to the storage engine 1. MyISAM: Transaction not supported, for read-only program lift high performance 2.InnoDB: Acid transaction, row level

server|web| Static | Page This article extracts from the Railway publishing house new "use BackOffice to establish Intranet/extranet application" (now in the Haidian book city has been sold, the field or Readers who need door-to-door can buy online

This article describes using memory-mapped files to modify large files: Adding a piece of data before large file memory, to use a memory-mapped file, you must perform the following steps: Creates or opens a file kernel object that identifies the

We usually write this.using (SqlDataReader DRM = Sqlcomm.executereader ()) { DRM. Read ();//The following shows the image stream in the database as it appears in the picture frame.

--Delete primary Key Alter TableTable nameDrop constraintPRIMARY Key Name--Add primary Key Alter TableTable nameAdd constraintPrimary Key NamePrimary Key(field name 1, field Name 2 ...)--to add a primary key for a nonclustered index Alter TableTable