Label:1. Relational databaseRepository for permanent data storagePHP variables are only temporary storage space "use memory space" to save variables during PHP script execution.Relational database: Use the relationship between the two to describe the entity information. "Using two-dimensional table field names and fields values to describe""Relational databases are not meant to use foreign keys to construct two tables as associations, but rather to im
,,What is the design principle of nosql? Is there a paradigm similar to that of relational databases?
I also found an article:Http://www.cnblogs.com/AllenDang/p/3507821.html! CommentsBasically, the design idea is what I mentioned above: Put the blog and comments together.This reduces the number of queries.However, a p
Do a year's freshman year project, for relational database structure or some understand, sometimes still feel that the two-dimensional table is not very comfortable. After reading an article, there is a preliminary understanding of NoSQL (Https://keen.io/blog/53958349217/analytics-for-hackers-how-to-think-about-event-d
The main characteristic of Cassandra is that it is not a database, but a distributed network service composed of a bunch of database nodes, a write operation to Cassandra will be copied to the other nodes, and the read operation to Cassandra will be routed to a node to read. For a Cassandra cluster, scaling performance
SSDBA high-performance NoSQL database that supports rich data structures to replace Redis.Characteristics
100 times times the capacity of Redis instead of Redis database
LevelDB network support, using C + + development
Redis API compatible, support for Redis clients
Suitable for storing collection data, such as list, hash, zset ...
Label:Sqoop is an open source tool that is used primarily in Hadoop (Hive) and traditional databases (MySQL, PostgreSQL ...) Data can be transferred from one relational database (such as MySQL, Oracle, Postgres, etc.) to the HDFs in Hadoop, or the data in HDFs can be directed into a relational
Key-Value Store databaseTemporary: as memcached. The temporary key-value database stores the data in memory, which in two cases results in the loss of data, the first is the power outage, but the data content exceeds the memory size. The benefits of this treatment are very fast.Permanent type: such as Tokyo Tyrant, flare and RomaThe two are both types: Redis. Redis first data in memory, and then meet certai
into the WYP table, you can go to the WYP table data directory under the view, such as the following command:
Found 1 Items
-rw-r--r--3 wyp supergroup 2014-02-19 18:23/hive/warehouse/wyp/wyp.txt
Copy CodeIt is important to note that:Unlike the relational
The NoSQL database lacks ad hoc query and data analysis tools. Even a simple query requires professional programming skills, and traditional BI tools do not provide a connection to NoSQL.
HIVE and PIG to address this problem by providing a more convenient way to access data, access to data stored on the H
In-depth analysis of NoSQL database distributed algorithms (graphic details), nosql text
Although the NoSQL movement has not brought about fundamental technological changes to distributed data processing, it still triggers overwhelming research and practices on various protocols and algorithms. In this article, I will
the time, I later on the Internet access to more information, found that my understanding is only partial. (Even the author's understanding is wrong, such as the author of 2.1.5 The consistency of the simple understanding of the role of check constraints) in fact, the primary foreign KEY constraints, check constraints are the scope of database integrity (why
Tags: style color ar os using SP data div onIn the process of driving big data projects, enterprises often encounter such a critical decision-making problem-which database solution should be used? After all, the final option is often left with SQL and NoSQL two. SQL has an impressive track record and a huge installation base, but
Throw exception if metadata tables is incorrect; throws an exception if the data meta-information check fails. Optional value:checked, unchecked
Use a Level 2 cache. Turn this off if metadata is changed independently of Hive Metastore server; Whether to use a level two caching mechanism.
I've described two ways in which hive imports analysis results into MySQL tables, respectively: Sqoop import and Using hive, MySQL JDBC driver, now I'm going to introduce a third, and use a lot more ways--using hive custom Functions ( UDF or genericudf) inserts each record into a database table.First, using the UDF me
Label:In the past, we only needed to learn and use a database technology to do almost all of the database application development. Because the mature and stable relational database products are not many, and for you to choose the free version is even less, so the Internet domain basically chose the free MySQL
We design relational database schemas with a complete set of solutions, but NoSQL does not. Half a year ago I read this "SQL anti-mode" book, feel very good. Just start to notice, is there an inverse pattern for nosql? A good counter pattern can be used in our design schema to tell where traps and cliffs are.
Tags: lazy expand lib Access time info version MySQL database blog artOverviewThe metadata information of Hive is usually stored in the relational database, and the common MySQL database is managed as a meta-
Kristóf Kovács, a software architect and consultant, recently released an article comparing various types of NoSQL databases.
Although the SQL database is a very useful tool, the monopoly is about to be broken after a 15-year solo show. It was only a matter of time: forced to use relational databases, but found that t
NoSQL databases: data consistency, nosql Database ConsistencyNoSQL Database: Data ConsistencyRead consistency
High ConsistencyAccess any node in the cluster at any time, and the data obtained is consistent;
User consistency is
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