By BOB BRYLA
Drawn to a occupation as an Oracle database expert yet do not know the place to start? The Oracle9i OCA and OCP certifications are of the most well liked IT certifications round, and the Oracle9i DBA JumpStart from Sybex supplies you with the forged origin in database management and programming fundamentals you have to earlier than embarking on a finished examine application. The JumpStart sequence was once constructed in keeping with requests from technical running shoes trying to determine a degree place to begin for college students of their school rooms. the writer is an skilled Oracle teacher who offers basic, tangible factors to make the realm of databases available to rookies to the IT box. you will find out about relational database recommendations, SQL*Plus or iSQL*Plus instructions, sorting and reporting recommendations, safeguard, and masses extra. if you find yourself performed with this booklet, you can be able to face the demanding situations of Oracle9i certification guidance.
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Because of their simplicity, key-value stores are extremely fast and relatively easy to scale. Relational databases are more difficult to scale, at least horizontally, but have a rich data model and a powerful query language. MongoDB is intended to be a compromise between these two designs, with useful aspects of both. The end goal is for it to be a database that scales easily, stores rich data structures, and provides sophisticated query mechanisms. 7 CSV stands for Comma-Separated Values, meaning data split into multiple fields, which are separated by commas.
8 Summary We’ve covered a lot. To summarize, MongoDB is an open source, document-based database management system. Designed for the data and scalability requirements of modern internet applications, MongoDB features dynamic queries and secondary indexes, fast atomic updates and complex aggregations, and support for replication with automatic failover and sharding for scaling horizontally. That’s a mouthful, but if you’ve read this far, you should have a good feel for all these capabilities. You’re probably itching to code.
When you query MongoDB and get results back, these will be translated into an easy-to-read data structure. The MongoDB shell uses JavaScript and gets documents in JSON, which is what we’ll use for most of our examples. We’ll discuss the BSON format extensively in later chapters. Where relational databases have tables, MongoDB has collections. In other words, MySQL (a popular relational database) keeps its data in tables of rows, while MongoDB keeps its data in collections of documents, which you can think of as a group of documents.