It is often said that economic development and transportation go hand in hand. As the Missouri Legislature considers sending the question of additional transportation funding to voters, it is worth revisiting the topic.
So what happens at the Capitol anyway?
Attention entrepreneurs - don't miss this event!
What do our local legislators say about the issues?
The following questions regarding four legislative and budget issues were asked of our local legislators. We thank Senator Mike Keheo and Representatives Jay Barnes and Mike Bernskoetter, for their thoughtful responses.For further information on Volta project click here.
Volta Control is a tool that allows you to design, implement and manage Cassandra database through a graphical interface. You will be able to display the list of keyspace and related tables in a node and carry out reading / writing / deleting operations using CQL code. You can free download Volta Control here.
Volta products are evolving projects. Report any bug you find to our pages SourceForge if the bug refers to libraries Volta, or send an email to support@satellitevolta.com if it refers to Volta tools.
Can I contribute to Volta products? How?
Suggestions and feedbacks are always welcome! Volta libraries are open source projects in all their respects: their pages on SourceForge provide both the jar package download and the entire code that you can download via SVN. If you want to report a bug, suggest an improvement or propose a modification click here. Volta tools are free, but not open source, anyway you are welcome to send suggestions to support@satellitevolta.com.
What are the licenses applied to Volta product?
The license applied to Volta libraries is Apache Software License 2.0.
Volta Criteria is a java library designed for those who want to integrate Cassandra database within their java application, providing intuitive methods for statement construct: you won’t have to write code (and therefore know the syntax ) CQL when carrying out CQL queries and statements. Volta Criteria is available as an open source project at its SourceForge page.
Volta Log is a java library that enables you to manage the logs of your application, saving them in Cassandra within a designated structure instead of a file. As a result, it ensures faster access to logs and a more efficient management of them. Volta Log is available as an open source project at its SourceForge page.
Volta Monitor is a health status monitoring tool: by connecting to a node, you can see the topology of the cluster and check the status, data loading and statistics on each individual node. You can free download Volta Monitor here.
• Absence of a fixed pattern: data are often stored in dynamic structures.
• Absence of join operations: there are not relationships between data, so it makes no sense to consider merge operations between them.
• Denormalization of data: in total contrast to relational databases, NoSQL databases encourage the replication of data across multiple facilities.
• Absence of warranty for all ACID properties: a NoSQL database does not guarantee the atomicity or isolation of its operations; texture is not always of “Eventually” type (i.e, “sooner or later” will be reached).
Apache Cassandra is a “key value / eventually consistent” NoSQL database, developed by Apache Software Foundation and released under an open source license. Its strengths lie in the optimization of the management of large amounts of data and in its distributed nature: a cluster of nodes Cassandra does not have single points of failure and therefore guarantees high reliability and excellent performance.
What kind of architecture does Cassandra use?
Apache Cassandra has a peer-to-peer distributed architecture: each node in the cluster is as important as the other and data are distributed as evenly as possible. The absence of elements of the master-slave architecture and the possibility of data replication gives high reliability to Cassandra.
What benefits do I get by using Cassandra?
A NoSQL database such as Apache Cassandra provides a perfect tool to manage large amounts of data with excellent performance, thanks to its scale. What is more, it has been designed as a peer-to-peer distributed system on multiple nodes or possibly multiple datacenters, it does not have single points of failure and so it guarantees high reliability and data availability.
Is Apache Cassandra the best choice for my application?
What are the limitations of Apache Cassandra?
There are some kinds of applications for which a NoSQL database Apache Cassandra is the best solution, but in other situations a relational database is the best choice. Choosing among various DBMS for your project, you must consider the following limitations of Cassandra: in this model join or data aggregation functionalities in general do not exist, because of both the base structure of Cassandra and the need to denormalize data, in order to read them from a single node cluster whenever possible. Data sorting is available only within individual partitions: this is due to the ability of Cassandra to manage large amounts of data. Sorting million tuples would be extremely expensive. It must be possible for data belonging to a single partition to be saved on a single node, because of the mechanism which uses Cassandra to save/read data through primary keys. “Physical” limitations on the saved data are: a single column cannot be larger than 2GB; type data collection may not exceed 64 KB; a single partition cannot contain more than 2 billion cells. Cassandra does not guarantee the isolation of its operations; atomicity is only partially provided and it increases costs; the texture is only of “eventually” type (i.e., “sooner or later ” will be reached).
What platforms does Apache Cassandra run on?
Apache Sofware Foundation provides free and open-source license with the download version of Linux for Cassandra. There are both free and premium versions for other operating systems, including Microsoft Windows, Mac OS and various Linux distributions such as CentOS, Debian and Ubuntu.
Where can I download Apache Cassandra?
Apache Cassandra is an open source and free software: you can download the version for Linux directly from the project website: http://cassandra.apache.org/download/. You will find references to other versions developed privately, available also for Microsoft Windows and Mac OS.
What is the CQL language?
CQL is Cassandra Query Language, implemented to provide developers and users with a language easier than Cassandra Thrift (the native language of Cassandra) to perform queries. As for syntax, the CQL is quite similar to SQL, using classic keywords such as SELECT, INSERT, UPDATE, DELETE, CREATE, DROP, etc.. Obviously, there are some differences and limitations due to the type of architecture that differs from the one of relational databases: there are not join functionalities, sorting is limited to the clustering key, the set of supported data types is different.
What datatypes does Cassandra support?
A keyspace in Cassandra is what in relational databases is commonly called “database scheme”, i.e. a container of tables. Each keyspace can contain multiple column families (tables). At the time of creation, the strategy you want to follow for replicating keyspace, and the replication factor associated with it, must be specified (i.e., how many nodes will replicate data contained in the keyspace).
In order to compare the concepts of NoSQL databases to those of relational databases (in general less tricky for those who know the classical model), we can say that a family column corresponds to the table concept. More precisely, a column family is a set of column, each of which will be specified by datatype and name.
A column in Cassandra is a tuple containing three values: the name of the column, the value in it and the timestamp of the last entry. In CQL columns is easily associated with a table column, that will be specified by datatype and name.
A primary key is, as in SQL, a column or set of columns whose values uniquely identify the row. If the primary key consists of more columns, they will form part of a partitioning key, others will be clustering columns.
A partitioning key is a column or set of columns in the primary key indicating which partition data of the associated row belong to, and in which nodes of the cluster data will be saved.
What is a clustering column?
A clustering column is a column that is part of a primary key, but that is not the partitioning key. So, it does not indicate the partition to which data belong, but it defines the sort order followed by data within that partition. Clustering columns may or may not be present and they can be one or more for each primary key.Mind never stop's racing, can't stick to anything, no impulse control

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