rdbms

IS Ms Access DBMS or RDBMS? I also do Google to find answer of this question,but in some website or blog says it is DBMS while others are says it is RDBMS.. so what is correct answer? and Please understand why it is DBMS or RDBMS? MS Access is a Relational Database Management System so therefore RDBMS , however you can use it in a non-relational fashion if you so wish so it can be used as a DBMS . Short Answer : Both. Detail : Microsoft Access is a DBMS but also something more: a personal database system . That is, a DBMS plus an application generator. While Microsoft Access contains a DBMS

Closed . This question is opinion-based. It is not currently accepting answers. Learn more . Want to improve this question? Update the question so it can be answered with facts and citations by editing this post . Closed 5 years ago . I'm not going to make a big long rattle on this question about what I've tested and number crunching. I'm more interested in actual up-to-date practice performances. I've read tons of articles already and some of them are pretty skeptical or either very pro to one library . I'm currently testing a bit with gorp , yet I have no clue how to compare the performances

I'm trying to create a simple script to dump the results of a complex view out into a table for reporting. I have used synonyms to simplify tweaking the view and table names. The idea is that the user of the script can put the name of the view they want to use as the source, and the name of the target reporting table in at the start and away they go. If the table doesn't exist then the script should create it. If the table already exists then the script should only copy the records from the view which aren't already in the table over. The script below covers all those requirements, but I can't

前言 最近需要将数据库从MySql迁移到PostgreSQL上来,故学习了下postgres的安装,写本文记录下. @Author duangr @Website http://my.oschina.net/duangr/blog/181914 1.相关环境 Host Name IP OS Arch duangr-1 192.168.56.10 CentOS 6.4 x86_64 2.部署规划 项 值 postgresql 9.3.1 程序安装目录 /usr/pgsql-9.3 数据文件目录 /var/lib/pgsql 3.代码获取 postgresql93-9.3.1-1PGDG.rhel6.x86_64.rpm postgresql93-contrib-9.3.1-1PGDG.rhel6.x86_64.rpm postgresql93-libs-9.3.1-1PGDG.rhel6.x86_64.rpm postgresql93-server-9.3.1-1PGDG.rhel6.x86_64.rpm 4.前提依赖 5.编译安装 先安装rpm rpm -ivh postgresql93-libs-9.3.1-1PGDG.rhel6.x86_64.rpm rpm -ivh postgresql93-9.3.1-1PGDG.rhel6.x86_64.rpm rpm -ivh

If I understand the CAP Theorem correctly, availability means that the cluster continues to operate even if a node goes down. I've seen a lot of people ( http://blog.nahurst.com/tag/guide ) list RDBMS as CA, but I do not understand how RBDMS is available, as if a node goes down, the cluster must go down to maintain consistency. My only possible answer to this has been that most RDBMS are a single node, so there is no "non-failing" node. But, this seems to be a technicality, not true 'availability' and definitely not high availability. Thank you. First of all, let me clarify and state that the

I'm starting on a new project that has some hierarchical data and I'm looking at all the options for storing that in a database at the moment. I am using PostgreSQL, which does allow recursive querying. I also looked into design patterns for relational databases, such as closure tables and I had a look at graph database solutions such as neo4j. I'm finding it difficult to decide between those options. For example: given that my RDBMS allows recursive queries, would it still make sense to use closure tables and how does that compare to graph database solutions in terms of maintainability and

I want to implement one-to-many concept in my application. This is the scenario: I have two tables (i). Person(ID, NAME, AGE, DEPT) (ii). Person Responsibilities(ID, RESP'S) One person may have more than one responsibility. How shall I implement a 1-n relationship here? Actually, I don't understand the correct concepts for this. Any suggestions or links to understand this concept would be appreciated. This one-to-many relationship can be interpreted in plain English like this... A Person has one or more responsibilities, AND Each responsibility belongs to exactly one person. Now depending on

what is the use of decimal and numeric datatype in postgreSQL. As per the reference the following is the explanation given to these datatypes. Decimal,numeric --> It is a user specified precision, exact and range up to 131072 digits before the decimal point and up to 16383 digits after the decimal point. The above statement shows the description of decimal and numeric datatype. But, still I didn't understand what is the exact use of these data type and where it is used instead of other datatypes. Answer with example is much appreciated... Right from the manual: The types decimal and numeric

How is it possible to calculate index size for specific column types in InnoDB i.e.: VARCHAR CHAR TIMESTAMP SMALLINT I've found a formula for MyISAM ( http://dev.mysql.com/doc/refman/5.7/en/key-space.html ): (key_length+4)/0.67 Does this work for InnoDB as well? I'm trying to estimate the size of a database I'm designing for sizing purposes. In InnoDB, the PRIMARY KEY is embedded with the data, so you can think of it as taking no space. For a secondary key... Take the MyISAM formula, but include the columns of both the secondary key and the PRIMARY KEY . Then multiply by 3. (There is a lot of