hackers handbook

: grant execute on dbms_rls to user1; Policy_name can be customized. ENABLE_POLICY () is used to enable or disable a vpd policy, but only one vpd policy on a table can be enabled or disabled at a time, to enable/disable the vpd policy for all tables at one time, you can follow the preceding procedure .) And set context: Then we query the vpdsample_clothing table, and only the clothing information with ID 10002 is returned. Similar to vpdsample_books, only the book information with ID 10005 is re

parameters, the default is to empty the animation queue, which is similar to stop (true), but stop () can only empty the animation queue, which clears all queues created by. Queue ()Plug-in mechanism$.fn.extend (object)Extend the JQuery element set to provide new methods (usually used to make plugins)ParametersObjectUsed to augment JQuery objects$.fn.extend Creating an JQ objectJQuery.fn.extend ({Property is check example $.checkCheck:function () {Return This.each (function () {this.checked = t

Shardsby default, each of the Index assigns 5 primary shards and 1 replica on Elasticsearch This means that if your cluster node has two Indexs you will have 5 primary shards and 5 replicashards each with a common ten shards. 650) this.width=650; "src=" Http://s1.51cto.com/wyfs02/M00/7B/19/wKiom1bG3VHRaTftAAAG_rUq6K8537.png "title=" 11.png "alt=" Wkiom1bg3vhratftaaag_ruq6k8537.png "/>each Elasticsearch Shard is a Lucene Index. Single Lucene Index has the maximum limit of documents. Limit

is called "Newgoblin"(you will have a different name) that has been started, electing itself as Master in a cluster. There is no need to pay attention to master meaning. The main point is that we have started a node in a cluster. As mentioned earlier, we can rewrite the cluster or node name. This can be done at the command line when the Elasticsearch is started, as follows:./elasticsearch--cluster.namemy_cluster_name--node.name My_node_namealso note that the labelHTTPinformation, aboutHTTPAddre

To facilitate the use of man, install the Chinese manual, as follows:Version: CentOS release 6.6 (Final)Chinese bag: http://pkgs.fedoraproject.org/repo/pkgs/man-pages-zh-CN/manpages-zh-1.5.1.tar.gz/13275fd039de8788b15151c896150bc4/The above Web site can download the Chinese manual, the following instructions under the command line installation:1. Download the installation package: # wget http://pkgs.fedoraproject.org/repo/pkgs/man-pages-zh-CN/manpages-zh-1.5.1.tar.gz/ 13275fd039de8788b15151c8961

Description: Information System Practice Notes series is the author in peacetime research and development has encountered the size of the problem, perhaps simple and subtle, but often is often encountered problems. The author is more typical of which to collect, describe, summarize and share.Summary: Introduce business-related code optimization (comparative abstraction, partial system analysis, and design).Body1. Problem arisesAs mentioned in the previous 2 notes () This client, a lot of trouble

() Componentwillupdate (Object Nextprops, Object nextstate) Componentdidupdate (Object Prevprops, Object prevstate) Componentwillunmount () In addition, the REACT provides two special state processing functions. Componentwillreceiveprops (Object Nextprops): Called when a loaded component receives a new parameter Shouldcomponentupdate (Object Nextprops, Object nextstate): Called when the component determines whether to re-render For a detailed description of th

://github.com/adam-p/markdown-here/raw/master/src/common/images/icon48.png "title text" Code and Syntax highlighting codes and syntax highlighting: 标记一小段行内代码：本文是一篇介绍`Markdown`的语法的文章如果高亮的内容包含`号，可以这样写：`` `包裹起来` ``语法高亮：```html``````cssbody{font-size:12px}``````javascriptvar s = "JavaScript syntax highlighting";alert(s);``````phpecho "hello, world!";?>``````pythons = "Python syntax highlighting"print s``` Block Code code grouping (code block): 在该行开头缩进4

Recommender systems handbook 6 This week I saw Chapter 1. The book consists of 25 chapters. From the point of view, this book provides a comprehensive introduction to the recommendation system, and also introduces some specificAlgorithm. There are some mathematical symbols in these formulas that I can't remember. The following is a summary of the first eight chapters:Chapter 1: Introduction to the book;Chapter 2: Data mining methods used in recomme

I read C # threading handbook for less business trips a few days ago, and I still feel a lot of GAINS. Now I want to write my own experiences and see better comments.This book covers a wide range of content. I only want to write something that I think is important but I didn't know before. 1. Thread LifecycleThe system. Threading. Thread class provides the start, stop, suspend, resume, join, and abort thread methods. You can view the thread status t

belong to?Typically used for marketing to define the target population.Orient yourself through cultural capital and economic capital, while thinking about where you want others to position youThe total capital of a person is cultural capital and economic capital15, what will make you happy?Immersion model.Happiness occurs when we are in the following situations:① a close focus on an activity② These activities are our own choice.③ neither challenging enough nor challenging too high④ have a clear

reference is required here: http://docs.djangoproject.com/en/dev/ref/contrib/csrf/ Workaround: Find middleware_classes in settings.py = (' Django.middleware.common.CommonMiddleware ', ' DJANGO.CONTRIB.SESSIONS.MI Ddleware. Sessionmiddleware ', ' django.middleware.csrf.CsrfViewMiddleware ', ' Django.middleware.csrf.CsrfResponseMiddleware ' , # # #添加这句, used for form token validation ' django.contrib.auth.middleware.AuthenticationMiddleware ', ' Django.contrib.messages.middleware.MessageMiddlewar

of the content.VI, I and EMThe I element in HTML4 represents the creation of italic text, and the HTML5 specification gives some examples of use, such as a dream, a technical term, an idea, or a ship name:Instead, the EM element represents an emphasis that can change the meaning of a sentence. One or more words contained in EM are emphasized in the sentence. If you move the EM element, that is, the emphasis on the content changes, the corresponding sentence also has a change in meaning.Seven, a

1. "Force" to obtain a singleton object requires a thread-safe approach, in which the method also guarantees thread safety.Description: Resource-driven classes, tool classes, and Singleton factory classes all need to be noted.2. "Force" when creating threads or thread pools, specify meaningful thread names to facilitate backtracking on errors.3. The Force thread resource must be provided through the thread pool, and it is not allowed to explicitly create threads in the app itself.Description: Th

instance.4. JQuery 1.4 Reference ManualJanuary 22, 2010, updated to jquery version 1.4, This edition is the reference Shawphy 1.4 online version of the production, updated a lot of previous content, not carefully checked before, found that before the online popular CHM version is based on 1.2, 1.3 of the content has not been added, this time to complement the whole. Marked with * 1.3 version of the new additions, @ 1.4 New additions to the content, easy to see.5. Ajax Chinese HandbookAjax is a

resolution.Castshadows: Let the terrain have a shadow. Like the shadows from the peaks.The following 6 parameters render parameter settings for trees or detail objects.The draw option indicates whether to render objects other than terrain. This is useful when you need to adjust the terrain on the terrain where you do all kinds of things.Detaildistance: When the camera exceeds this distance, the details play a stop display.Detaildenstiy: detailed density. Finer granularity of rendering.Treedista

, and the statement "3 greater than or equal to 3" was output.Using the Else statement in a for loopExecutes the statement block of else if the for condition statement is false or if no break is interrupted after the end.For example:names = [' Duyuheng ', ' Duzhaoli ']for name in Names:if name = = "Du": Print (' name: ', name ') Break print ("Loop Name column Table "+name" Else:print ("No looping data!") ") Print (" End loop! ") ")C:\python\python.exe c:/python.py/tiaojianxunhuanyuju.pyCircular

= [' study ', ' Python ', ' is ', ' happy '] #按字符串由短到长排序field. Sort (key=len) print (field)C:\python\python.exe c:/python.py/liebiaofangfa.py[' Is ', ' study ', ' Happy ', ' python ']#按字符串由长到短排序, you need to pass two parametersField.sort (key=len,reverse=true) print (field)C:\python\python.exe c:/python.py/liebiaofangfa.py[' Python ', ' study ', ' Happy ', ' is ']Can do sort after reverse orderFor example:Num=[8,6,1,4,5]num.sort (reverse=true) print (num)C:\python\python.exe c:/python.py/liebia

with the # number and can have a single line or the end of a statement that can be placedFor example:>>> #打印1 +1 results ... print (up to)2Results of >>> print (#打印2 +2)4Everything from the beginning of the # will be ignored.DebuggingWhat happens if I convert a character with int ()?>>> int (' Hello ')Traceback (most recent):File "Valueerror:invalid literal for int. () with base: ' Hello 'Error: ValueError: Invalid text for int (), using radix: "Hello"In variables and keywords, what happens if