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Http://www.aliyun.com/zixun/aggregation/13717.html ">kinect SDK v1.7 ushered in a major update published in 2013-03-18 14:01| Times Read | SOURCE csdn| 0 Reviews | Author Zhang Kinectkinect Fusion Microsoft development Tools SDK Open Source Summary: Kinect for Windows SDK 1.7, this is since last released K ...

Gc++ 4.8 Released, elevated support for c++11 published 2 hours ago | Times Read | SOURCE oschina| 0 Reviews | Author Oschina c++gcc Open Source Summary: GCC (GNU Compiler Collection,gnu Compiler Suite) is a set of programming language compilers developed by GNU. It is a set of GPL and LGPL license issued by the http://www.aliyun.com/zixun/aggregation/2960 ...

Recently in use Cassandra, the version is 1.1.1, CQL version is 3.0.0. Encountered the following problems. Objective: To query and sort using compound primary key, and to use two-level index for multiple condition query. First CQL the table, using the composite primary key (instigator, Startedat): &http://www.aliyun.com/zixun/aggregation/37954.html ">nbsp; CREATE T ...

Several tables were created through CQL, such as: Create TABLE FileIndex (recid varchar,agentno varchar,customerno varchar,recfile Varchar,primary KEY (recid)); CREATE INDEX on FileIndex (AGENTNO); CREATE INDEX on fil ...

&http://www.aliyun.com/zixun/aggregation/37954.html ">nbsp; Hi Neo, my name are Stephanie Huynh and I work with the Apache Cassandra community. I work at DataStax with the co-founder ...

A data storage project that decides to use Cassandra as a data storage server, taking into account Cassandra's outstanding write performance. Several http://www.aliyun.com/zixun/aggregation/14356.html "> Performance tests were performed before use: Write performance and read performance respectively. Version: 1.1.2. Server cluster: Three servers, 8 cores, 8G RAM, same LAN. Results: Write performance test, replication factor (Replication_ ...)

Solution could only is replicated to 0 nodes, instead of 1 blog categories: Small record ~ Beware ~ hadoopreplicated to 0 nodes&http://www.aliyun.com/ Zixun/aggregation/37954.html ">nbsp; After you open the start-all.sh script for Hadoop, execute the example ...

One-to-one relationship: Embed, such as http://www.aliyun.com/zixun/aggregation/10619.html "> User information collection has Address field, Address field has three fields of province, city, county. Modeling is as follows: a one-to-many relationship: An article has multiple comments, for 1 to multiple relationships because MongoDB has a size limit of 16M (higher than v1.8 ...) for single documents (document).

Absrtact: MapReduce technology for large-scale data analysis has been widely recognized and researched, we have seen the explosive growth of cloud data service system. These new systems are so-called "cloud OLTP" applications, although they do not support acid transactions. Typical examples are http://www.aliyun.com/zixun/aggregation/14239.html ">bigtable,pnuts,cassandra,hbase,azure,couch ...

Learn about problems with Hadoop and Solutions blog Category: Cloud computing hadoopjvmeclipse&http://www.aliyun.com/zixun/aggregation/37954.html >nbsp; 1:shuffle error:exceeded max_failed_unique_fetches; Bailing-out Answer: Program inside need ...

Replica sets+http://www.aliyun.com/zixun/aggregation/14273.html ">sharding architecture is as follows: 1,shard server: Using Replica Sets ensures that each data node has the ability to backup, automatic fault-tolerant transfer, and automatic recovery. 2, configure the server: Use 3 configuration servers to ensure metadata integrity 3, routing process: Use 3 routing processes to achieve balance, improve client access ...

&http://www.aliyun.com/zixun/aggregation/37954.html ">nbsp;1.find MongoDB uses Find to query. The query is to return a subset of the files in the set. The child collection ranges from 0 documents to the entire collection. The first parameter of find determines which documents to return. The form is also a document that describes the details to be queried. The empty query document {} matches the entire contents of the collection. If you don't specify ...

"51CTO exclusive feature" 2010 should be remembered, because the SQL will die in the year. This year's relational database is on the go, and this year developers find that they don't need long, laborious construction columns or tables to store data. 2010 will be the starting year for a document database. Although the momentum has been going on for years, now is the age when more and more extensive document databases appear. From cloud-based Amazon to Google, a number of open-source tools, along with the birth of Couchdb and MongoDB. So what ...

1.count Count returns the number of documents in the collection &http://www.aliyun.com/zixun/aggregation/37954.html ">nbsp;db.refactor.count () No matter how large the collection is, the number of documents can be returned quickly. You can pass the query, MongoDB calculates the number of query results Db.refactor.count ({...).

1: A simple introduction MongoDB is a distributed document database, supporting the master-slave structure of similar closed-type database, the document is stored in binary http://www.aliyun.com/zixun/aggregation/16702.html ">json form", No locks, no transactions, indexed. 2: Installation Steps Step one: Download the assembly http://www.mongodb.org/downloads Part II: Extract and extract the relevant bin directory to C ...

We can see that the widely criticized global locks have been removed in this version, replaced by db-level locks, and collection-level locks are not far off. Here is a look at the 2.2 version of several new features: 1. Concurrency performance enhancements As mentioned above, http://www.aliyun.com/zixun/aggregation/13461.html ">mongodb In version 2.2 There is no longer a global lock over the entire daemon, but a lock ...

MongoDB released the 1.6.0 version, which is the fourth major stable version of the 1.0,1.2,1.4 version, and released the 1.6.1 release on August 17. This release focuses on enhanced dynamic expansion (Scale-out) features, http://www.aliyun.com/zixun/aggregation/14273.html ">sharding functionality is already available in the production environment." Use both horizontal and replication collections (replica sets ...).

MongoDB is a product between relational database and non relational database, and is the most powerful and relational database in the relational database. The data structure he supports is very loose and is a JSON-like Bjson format, so you can store more complex data types. The biggest feature of MONGO is that the query language he supports is very powerful, and its syntax is somewhat similar to an object-oriented query language, which can almost achieve most of the functions of a single table query like relational database, and also supports indexing data. Just released MongoDB 1 ...

Recent discussions about http://www.aliyun.com/zixun/aggregation/22.html "> The future of the relational database have been growing, and 51cto.com has previously reported on whether the end of the relational database has arrived" and The fundamental problem analysis of relational database is widely concerned. 　　Today we introduce a new document-type database MONGO. MONGO is a high-performance, open source, modeless document database, it's in many scenarios ...

A few days ago on the hacknew appeared an article, the title is very sturdy, called "Don" T use http://www.aliyun.com/zixun/aggregation/13461.html ">mongodb", Its content is also directly expressed dissatisfaction with the MongoDB, the author enumerated the MongoDB in the use of various problems encountered. Even rise to the challenge of their development team, saying they may only care about benchmark data, not the number of users ...