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Dynamic | data | Database connection database connection pool in writing application services is often required to use the module, too frequent connection of the database is a bottleneck in terms of service performance, the use of buffer pool

I've often seen people ask this question, I've set up multiple indexes on the same table, why does Oracle choose one at a time and not use multiple indexes at the same time? Generally speaking, the common access to the same table more than two

Compared to the different pages of the jump, Ajax can be said to greatly improve the user's browsing experience, do not see the screen between the page is a very comfortable thing. But many of the earlier Ajax apps did not support the browser's

(7) Database information functions (2):1, Mysql_fetch_field ()Format: Object Mysql_fetch_field (int query, int [field_offset]);Returns 1 objects, a hash table, labeled:Table: Tables NameName: Field nameMax_length: Maximum length of this

The use of sharing technology to effectively support a large number of fine-grained objects. When dealing with strings in. NET, there is an important mechanism, called the string-resident mechanism, in which the use of the element pattern is used.

Original intention: At the beginning of 2011, when I learned about the switch link aggregation technology, I had a question in my mind: The switch receives a message, arrives at the aggregation mouth, how chooses the member mouth to go out? Was

In web development, many developers prefer to use JavaScript to get the current URL URLs, this article for you to summarize the more commonly used to get the URL of the JavaScript implementation code The URL is the Uniform Resource Locator (uniform

1. Overview E-Mail is one of the most commonly used network applications, and has become an important channel for communication. But spam spam most people, and recent surveys show that 93% of respondents are dissatisfied with the amount of junk mail

Introduction: The most obvious feature of Ajax-based WEB applications is the use of the native-supported XMLHttpRequest object in the browser with the backend server for data communication, because this type of communication does not require page

Basic principle In C # Implementation in this process, we need to do the following steps: Gets the local host file corresponding to the current process; Open this file stream; The hash algorithm is determined to compute the hash of the file

optimization | statement | execution 5th. Oracle's execution planbackground knowledge: To better carry out the following, we must understand some conceptual terms: 　　 Sharing SQL statementsIn order not to parse the same SQL statement repeatedly

Although the previous article introduced the Native_full_outer_join and no_native_full_outer_join two hint, but in fact Native_full_outer_join did not play any role, Because Oracle's optimization of the full outer join makes the new execution plan

Bencode Editor can be edited for UT resume.dat configuration files and. torrent seed files for a variety of purposes, with a summary of the following three usage. Note: All the following changes are in the state of UT shutdown, and special

Although there are still a lot of problems with keyhashvalue, it is generally possible to determine that "Keyhashvalue is used to lock resources." Rather than what I said before, in order to quickly find the corresponding records according to this

1. Nested loop join (nested cyclic join) Algorithm: The idea is quite simple and straightforward: for each tuple R of relation R, it is directly compared with each tuple s of relation s in the field of the join condition, and the eligible tuples

Timer Overview Public constructors The Timer constructor has been overloaded. Initializes a new instance of the Timer class. Public properties Container (inherited from Component) gets the IContainer, which contains Component. Enabled Gets or sets

1, LRU linked list structure overview In the front, we already know how Oracle searches the hash chain for the corresponding buffer header of the data block, and we know that if the desired buffer header is not found on the hash chain, Oracle will

Servlet|session first, the term sessionIn my experience, the term "session" is probably second only to transaction, and it is more interesting that transaction and session have the same meaning in some contexts.Session, Chinese often translated as a

Topic Link: Uva:http://uva.onlinejudge.org/index.php?option=com_onlinejudge&itemid=8&category=24&page=show_ problem&problem=1066 poj:http://poj.org/problem?id=2549 Type: hash, two-point lookup Original title: Given S, a set of integers, find

Redis is a key-value storage system. Similar to memcached, it solves the situation where data is completely lost after a power outage, and she supports more untyped value types, and supports lists (list), sets (set), and Zsets (ordered sets) of data