Sounds like a VSAM database. Just a key and data area, meanings are what you assign to them, no database catalog to define the individual fields.
On Tue, Oct 15, 2013 at 10:51 PM, Ze'ev Atlas <zatl...@yahoo.com> wrote: > Since NoSQL seems to be reigning supreme, I decided to study MongoDB which > was both recommended by a friend (a PM who is managing an actual project with > that stuff) and is the most popular NoSQL engine out there according to > http://db-engines.com/en/ranking (they don't count Hadoop since they > considered it to be a file system.) > As usual, I acquired the book (O'Reilly - mongodb the definitive guide) and > began to read... > > And here is why I post it here, I have the sense of deja vu all over again! > > Forget about the fancy terminology of storing "Documents" rather then rows or > records. In the end it is the same. They have all the CRUD actions (i.e. > Create, Remove, Update and Delete) which are done via some API functions > rather then SQL statements. They can index and access stuff fast. They can > partition the database over many servers and thus scale out... all is good. > > But here is the real scoop! No Joins and if you want to store some row... > er... document of different structure that relate to the current one, you'd > rather store it as a sub document (i.e. a different structure that is part of > your current row (i.e. hierarchical) or in a different collection that you > should navigate into in the application side. > > Mmm, have I just used the words navigate, hierarchical, etc. No wonder that > all those younger people are so excited about NoSQL, they have never seen it > before. But we, veterans of IMS, IDMS, ADABAS and the like, our old skills > are new again! > > Welcome back to the future. > > ---------------- > BTW, I do not bad mouth the technology, it is very useful (as were IMS and > IDMS) and I can see replacing all warehouses and Star Schemas with that > stuff, it is more natural, faster and more scalable then the current SQL > based warehouse technologies. > > ZA > > ---------------------------------------------------------------------- > For IBM-MAIN subscribe / signoff / archive access instructions, > send email to lists...@listserv.ua.edu with the message: INFO IBM-MAIN -- Mike A Schwab, Springfield IL USA Where do Forest Rangers go to get away from it all? ---------------------------------------------------------------------- For IBM-MAIN subscribe / signoff / archive access instructions, send email to lists...@listserv.ua.edu with the message: INFO IBM-MAIN
