talend scenarios

Label:MongoDB usage scenarios and unused scenes 2012-09-26 10:30:18Category: Linux 1.mongodb Introduction MongoDB (named from "Humongous") is a scalable, high-performance, open-source, schema-free, document-oriented database. It is written using C + +. MongoDB Features: A. Collection-oriented storage: suitable for storing objects and data in JSON form. B. Dynamic query: MONGO supports rich query representations, and query directives use JSON-style ma

Four Common scenarios of Activity and four scenarios of activity 1. Common singleInsyance application scenarios: ① Mobile phone dialing interface (mobile phone dialing interface is used for numbers such as QQ and SMS) ② Social APP sharing page (QQ, zhihu) --External App calls the entry of its own client programThe singleInstance startup mode is used. The follow

Common business scenarios in enterprise-level development of wpf and enterprise-level business scenarios of wpf A few days ago, I got an internal inventory management system in the company. It took about two months to understand the requirements, system design, and coding. Later, the company made other arrangements, this is yellow. By the way, some people in the factory did not really care about others' fe

1, the general performance test:When we perform performance testing, the system is low-concurrency or no concurrency, and the system does not stress the test as a general performance test. The main factor is to verify that our system meets the performance requirements under normal circumstances. For example, two login system, if the system logon time is 8 seconds, then this system will not need to perform performance testing, because it does not even the general requirements2. Load test:Simulati

In JavaScript, this is applicable to nine application scenarios and three composite application scenarios, and javascript9 Scenario 1: this in the global environment points to a global object. this.a = 10;alert(a);//10b = 20;alert(this.b);//20var c = 30;alert(this.c);//30 Scenario 2: this of an object's internal function points to the current object that calls the function. var a = 10;var bar = { a: 20, tes

Python reflection mechanism is explained in actual application scenarios, and python scenarios Analysis of the essence and actual application scenarios of the "reflection" mechanism in pythonI. Preface Def s1 (): Print ("s1 is the name of this function! ") S = "s1" Print ("% s is a string" % s) In the above Code, we must distinguish two concepts: f1 and f

[Switch] MySQL optimistic lock practices in Distributed scenarios, mysql scenariosBackground In the E-commerce shopping scenario, when we click shopping, the backend service will perform inventory reduction for the corresponding products. When a single instance is deployed, we can simply use the lock mechanism provided by JVM to lock the inventory reduction operation to prevent inventory inconsistency caused by multiple users clicking the purchase at

In-depth analysis of Java I/O class features and application scenarios, in-depth analysis of application scenarios There are more than 40 classes related to input and output in Java. If the relationship between them is not clarified, they cannot be used flexibly. If the stream flow is divided, it can be divided into the input stream and the output stream, and the input stream and the output stream can be di

compilation process, I encountered the following problem, which took a long time to solve. JNI/.../../classes/helloworldscene. cpp: 118: Error: Undefined reference to 'secondscene: createscene ()'Clang ++: Error: Linker command failed with exit code 1 (use-V to see Invocation)Make: *** [OBJ/local/armeabi/libcocos2dcpp. So] Error 1 Solution: register for each new scenario, find the Android. mk file under the JNI --> classes directory, and add the new scenario file secondscene. cpp. 1 LOCAL_SRC_F

Application scenarios and scenarios of optimistic locks and pessimistic locks Locking)During the implementation of business logic, data access needs to be exclusive. For example, end computing on the day of the Financial SystemProcessing, we want to process the data at a cut-off time point, rather than in the settlement process.(Several seconds or several hours), and the data changes again. In this case, w

Oracle442 application scenarios --------- database logic object management application scenarios, database Logic Design Use Case 128: create a temporary table Create a temporary table temp_goods Create global temporary table temp_goods(GoodsId NUMBER,GoodsNum NUMBER,Price NUMBER)On commit delete rows; Create a temporary tablespace Create temporary tablespace tbs_t1TEMPFILE 'tbs _ t1.f' SIZE 50 m REUSE AUTOE

Oracle442 application scenarios --------- database logical object management application scenarios Use Case 128: create a temporary table Create a temporary table temp_goods Create global temporary table temp_goods(GoodsId NUMBER,GoodsNum NUMBER,Price NUMBER)On commit delete rows; Create a temporary tablespace Create temporary tablespace tbs_t1TEMPFILE 'tbs _ t1.f' SIZE 50 m REUSE AUTOEXTEND ONMAXSIZE UNLIM

SQL Optimization in specific scenarios and SQL Optimization in specific scenarios 1. It is best to modify the data of a large table in batches. Delete and update the 10 million rows record in the 1 million rows record table. Only 5000 rows of data are deleted or updated at a time. After each batch of processing is completed, the synchronization process is paused for several seconds. 2. Modify the tabl

This article mainly introduces the use of Ajax and the application of Ajax scenarios, let us know exactly where Ajax should be used. Now let's read this article together. Ajax Application Scenarios1. Form-driven interactiontraditional form submission, after the text box input content, click the button, after the background processing, the page refreshes, and then go back to check whether the refresh results are correct. Using AJAX, after clicking the

Oracle442 application scenarios ---------- basic application scenarios /// // Basic knowledge ////////////////// Application Scenario 178: the simplest select statement SELECT * FROM Employees; Use Case 179: Specify the column to be queried COL EMP_NAME FORMAT A20Col sex format A10Col title format A10SELECT Emp_name, Sex, Title from hrman. Employees; Use Case 180: Use the DISTINCT keyword SELECT Title fro

scheme. The Master Linux CPU core uses the Remoteproc API to control the lifecycle of the remote kernel (life cycle management LCM), assigning system resources to remote processor and creating virtio devices. Communication between software running on different CPU cores is implemented through the Rpmsg API.Key processes for this scenario:(1) Design Bare-metal.elf program based on Remoteproc and rpmsg.(2) Bare-metal.elf is added to the Petalinux project, and subsequent Remoteproc calls bare-meta

for objects and JSON data: The MONGO Bson data format is ideal for storing and querying document formats.Not suitable for the scene:A. A highly functional system: such as a bank or accounting system. The traditional relational database is still more suitable for applications that require a large number of atomic complex transactions.B. Traditional business intelligence applications: a BI database for a specific problem will produce highly optimized query methods. For such applications, the Data

spatial use of a hash cluster Scenario 167: Estimating the amount of space required for a hash cluster Scenario 168: Modifying and deleting a hash cluster Scenario 169: Using the Dba_cluster_hash_expressions view to view the hash function SELECT * from Dba_cluster_hash_expressions; Scenario 170: Creating a sequence CREATE SEQUENCE Hrman. emp_sMINVALUE 1NomaxvalueSTART with 1INCREMENT by 1NocycleCACHE 20; Scenario 171: Modifying a sequence ALTER SEQUENCE Hrman. emp_sMAXVALUE 10000; Scenario 172:

equivalent to var other = {name: "Tom", showName: function () {alert (this. name) ;}} other. showName (); // Tom [Compound scenario 2] Var name = 2; var a = {name: 3, fn: (function () {alert (this. name) ;}) (), fn1: function () {alert (this. name) ;}}. fn; // 2 [this in the anonymous function points to the global object]. fn1 (); // 3 [this of the internal function of the object points to the current object that calls the function] [Compound scenario 3] Var name = "Bob"; var nameObj = {na

equivalent to var other = {name: "Tom", showName: function () {alert (this. name) ;}} other. showName (); // Tom [Compound scenario 2] Var name = 2; var a = {name: 3, fn: (function () {alert (this. name) ;}) (), fn1: function () {alert (this. name) ;}}. fn; // 2 [this in the anonymous function points to the Global Object]. fn1 (); // 3 [this of the internal function of the object points to the current object that calls the function] [Compound scenario 3] Var name = "Bob"; var nameObj = {na