internal cache

Struts2 The nature of Struts2 can be divided into three parts? A: The core control layer (Filterdispatcher), the Business Control layer (Action), and the user implement the enterprise business logic components. The basic

Hibernate cache is divided into two levels, the first level is stored in the session called a cache, default and cannot be uninstalled. The second level is the process-level cache controlled by Sessionfactory. is a globally shared cache, and any

MySQL logs can be set up via MySQL's my.cnf file. However, if the log file is not cleaned or recycled for a long time, it will cause the log file to become bigger and larger, thus affecting the performance of MySQL. And the use of the RPM package

First, optimize the CPU in the BIOS 1, open CPU level two cache For some special motherboards, some features of the CPU are not turned on by default, and they need to be turned on in the BIOS, such as internal CPU cache and Hyper-Threading

The main difference is whether to delay loading. Load methodThe database is not accessed immediately, and the Load method returns an uninitialized proxy object when the record you are trying to load does not exist. Get method Always access the

(1) When the record does not exist, the Get method returns the Null,load method to produce an exception (2) The Load method can return the proxy class of the entity, and the Get method returns the true entity class (3) The Load method can take

Previous blog about MongoDB mmapv1 storage engine, this article then introduces mongodb Another storage engine-- wiredtiger wiredtiger mongodb3.0 mongodb3.2 version began to become mongodb default storage engine. Compare mmapv1

Hibernate's caching mechanism1. Hibernate is a persistent layer framework that accesses physical databases frequently to reduce the frequency of application access to physical data sources, thereby improving application performance.The data in the

about Hibernate:Hibernate is an open source framework, which is a framework for object-relational mapping, and it is a lightweight encapsulation of JDBC, and our Java programmers can manipulate the database using object-oriented thinking.Hibernate

First, EXT2 and EXT3The file system that was used by default in Linux before is Ext2,ext2 file system is really efficient and stable. However, with the application of Linux system in the key business, the weakness of Linux file system is gradually

This is the fifth article in the series "Become a Java GC expert". In the first in-depth Java garbage collection mechanism, we have learned the different GC algorithm flow, GC working principle, the new generation (young Generation) and the old

For a long time, ext3 is the default file system for many Linux distributions, and now Ext4 has been released, and a distribution has started to use EXT4 as the default file system (in fact Ext4 was originally an extension of ext3, but to ensure ext3

The cache consistency protocol is a natural need to keep cache consistency. The cache is inconsistent because the same data has multiple copies in multiple caches, and if the data is written in one cache and another cache is not known, there will be

Then the previous article http://www.cnblogs.com/oumyye/p/4314412.htmlJava I/O stream---memory operation Flow bytearrayinputstream and BytearrayoutputstreamThe bytearrayinputstream contains an internal buffer that contains bytes read from the stream,

Excerpt from: http://symphony.b3log.org/article/1376986299174First, what is the cache1, Cache is a special memory subsystem of buffer memory, which replicates frequently used data to facilitate fast access2, generally located in the speed difference

Problem description I developed a new feature of the website: need to process the online table data of the batch merge and update , yesterday afternoon released on the line, the implementation of this function, the server load suddenly

1.Hibernate What are the ways to query data(1) Navigation object Graph query(2) OID Query(3) HQL(4) QBC(5) Local SQLthe difference between 2.load () and get ()Load Loading method:Users user = (users) session.load (Users.class, userId);Get Loading

This example summarizes the Python read-write file method. Share to everyone for your reference. The specific analysis is as follows: 1.open Always remember to call the close () method of the file object when you open the file with the. For

What's Gil? The first thing to be clear is that Gil is not a Python feature, it is a concept introduced when implementing the Python parser (CPython). Just like C + + is a set of language (syntax) standards, but can be compiled into executable code

Central Processor CPU CPU is the heart of the computer system, computer, especially the rapid development of micro-computer, is essentially the CPU from low-level to advanced, simple one-way complex development process. First, the concept of the