mongodb 3 6 features

participate in voting, do not copy, or become active nodes. 4. Advanced Parameters Priority: 0 to 1000. 0 indicates a copy node, and 1 to 1000 indicates a regular node. ArbiterOnly: true arbitration Node Usage Members ":[{ "_ Id": 1, "Host": "127.0.0.1: 1111", ArbiterOnly: true }]" 5. Rules set for arbitration when the priority is the same When the priorities are the same, it will be based on the time. For example, when A is an active node and B and C is A replica set, When A goes down, mongo s

For a long time, since a large number of (or even almost all) Java applications rely on databases, it has been a hot topic for programmers to use the Java language to access databases efficiently, reliably, and concisely. The newly released Java SE 6 is also upgraded in this regard, providing programmers with many useful new features. Specifically, Java SE 6 has

This section briefly introduces the new features of C #6, A few weeks ago I read some new features related to C #6 in different places. I decided to collect them all together. If you haven't read them, you can repeat them all at once. Some of them may not be as magical as expected, but it is only the current update. Yo

). However, gamecenter is also added to mountain lion. That is to say, in the future, we may be able to use iOS devices and Mac to play online through gamecenter, or even directly use Mac and MAC for online combat. This provides a good idea for individual developers who do not have their own servers/do not write their own back-end servers/do not have the energy to maintain. It is not difficult to use gamecenter to make some simple online games. Due to the gamecenter feature, this cost will be v

("5198c286c686eb50e2c843b3"), "name": "user1", "age": 1} {"_ Id": ObjectId ("5198c286c686eb50e2c843b4"), "name": "user2", "age": 2} {"_ Id": ObjectId ("5198c286c686eb50e2c843b5"), "name": "user3", "age": 3} {"_ Id": ObjectId ("5198c286c686eb50e2c843b6"), "name": "user4", "age": 4} {"_ Id": ObjectId ("5198c286c686eb50e2c843b7"), "name": "user5", "age": 5} {"_ Id": ObjectId ("5198c286c686eb50e2c843b8"), "name": "user6", "age":

ExtJS new features Introduction using the Extjs,sencha team to develop a simple framework for creating applications that run on any type of device, from mobile to tablet to desktop, you will be able to produce the best user experience, write less code, combine a compelling and better subject, ExtJS has all the resources to create an amazing user experience on any device.1 merging of ExtJS and Sencha touchIn Extjs5, the ExtJS and Sencha touch have been

1. Use System.GC () to request Java garbage collection regardless of which garbage collection algorithm the JVM is using. there is a parameter in the command line-VERBOSEGC can view the heap memory used by Java, its format: JAVA-VERBOSEGC classfile1 classTESTGC {2 　 Public Static voidMain (string[] args) {3 　 　 NewTESTGC (); 4 System.GC (); 5 system.runfinalization (); 6 } 7 }

Original address: Http://www.oschina.net/translate/briefly-exploring-csharp-new-featuresA few weeks ago I read about some of the new features of c#6 in different places. I decided to collect them all together, and if you haven't read them, you can go through them all at once. Some of them may not be as magical as expected, but that's just the current update.You can get them by downloading VS2014 or installi

New Features of C ++ 11 (6) range-based for Loop In C ++ 11, a Range-based for loop is added, which saves much of our code. From Wikipedia: http://zh.wikipedia.org/wiki/C++0x#.E5.80.99.E9.81.B8.E8. AE .8A.E6.9B.B4 Boost C ++ defines many concepts of "range. The range is like a list, which holds two points in the container. An ordered container is a superset of the range concept. Two iterators in an ordered

is well resolved: EJB Jndi names can no longer be arbitrarily customized, Ejbjndi's full name specification: Java:global[/ It contains the war package name App-name,jar package name Module-name, custom bean name Bean-name, the full address name of the interface, and stateful if you need to declare stateful. such as: commondao/utm/common_dao!com.hp.ngoss.utm.commondao.commondaobusiness The client of EJB3.1 JBoss has two topics detailing th

set, but set in interactive scripts. For example: if [ -z "$PS1" ]; then echo This shell is not interactiveelse echo This shell is interactivefi 6.3.3 Interactive Shell BehaviorWhen shell runs in interactive mode, its behavior changes in some aspects.1. Read and execute the Startup File according to the description in the bash Startup File section.2. Enable job control by default (see job control ). When the job control is effective, bash ignores the job control signals generated by the k

, it will only issue to the JVM such a request, whether or not to actually perform garbage collection, everything is unknown.(3) Pick a garbage collector that suits you.In general, if your system does not have special and demanding performance requirements, you can use the JVM's default options. Otherwise, you might consider using a targeted garbage collector, such as an incremental collector, which is more suitable for systems with higher real-time r

record should be inserted into according to the hash algorithm.Example 1:2 partitionsCREATE TABLE Part_hash1(Col Number (8),INF VARCHAR2 (100))Partition by hash (COL)(Partition P1 tablespace users,Partition P2 tablespace ts_find);INSERT into PART_HASH1 values (1, ' B ');INSERT into PART_HASH1 values (2, ' B ');INSERT into PART_HASH1 values (3, ' B ');INSERT into PART_HASH1 values (4, ' B ');INSERT into PART_HASH1 values (5, ' B ');INSERT into PART_HA

the same. is to temporarily swap infrequently accessed data from memory to disk, freeing up valuable memory for other data that needs to be accessed. Especially for memory databases such as Redis, memory is never enough. In addition to splitting the data into multipleRedisserver outside. Another way to improve database capacity is to use virtual memory to swap infrequently accessed data to disk.Configuration:vm-enabled Yes #开启vm功能Vm-swap-file/tmp/redis.swap #交换出来的value保存的文件路径Vm-max-memory 10000

6 Bash features This section describes the unique features of Bash.* Call Bash: command line options acceptable to Bash.* Bash Startup File: When and how to execute the script in Bash.* Interactive Shell: What is an interactive shell.* Bash conditional expression: the expression element used by the built-in command test.* Shell arithmetic: the arithmetic of shell

database backups. Execute the command, and the result example is as follows: Copy Code code as follows: Db.runcommand ({fsync:1,lock:1}) {"ErrMsg": "Access denied; Use admin db "," OK ": 0} Use admin > Db.runcommand ({fsync:1,lock:1}) { "Info": "Now locked against writes, use Db.fsyncunlock () to unlock", "Seealso": "Http://www.mongodb.org/display/DOCS/fsync+Command", "OK": 1 } 5. View current lock status Copy Code code as follows:

Introduction: Assuming that you are a C + + developer, you need to quickly perform some prototyping with Ruby. When you pick up a ruby reference book (such as pickaxe) or browse the Ruby Web site, you'll see some familiar constructs such as class declarations, thread support, and exception handling. Just when you think you know how Ruby works, you realize that the concurrency mechanism in your Ruby code is not the same as the Boost thread, that catch and throw are quite different from what they

New features of modern PHP series (6) -- ZendOpcache 1. Overview Bytecode cache is not a new feature of PHP, and many independent extensions can be implemented, such as APC, eAccelerator, and Xache. Up to now, these extensions have not been integrated into the PHP kernel, starting from PHP 5.5.0, PHP has a built-in bytecode cache function named Zend Opcache. Before starting, let's take a look at what is t

New Features of JDK 6 9: Common annotationsCommon Annotations was originally part of the Java EE 5.0 (JSR 244) specification, and sun now places a part of it in Java SE 6.0. with the addition of the annotation metadata function (JSR 175) to Java SE 5.0, many Java technologies (such as EJB and Web Services) the annotation part is used to replace the XML file to configure running parameters (or support Declar

Hibernate founder and SEAM project leader Gavin king recently published Article The first article in the series, which describes the new features he expected to see in Java EE 6. The first proposal in the Gavin list is to provide more concurrecy modes for stateless and stateful session beans ). He proposed three solutions: No concurrency. The default mode is also supported currently: bean does not supp