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NoSQL Roundup
- 1. NoSQL Roundup - DAN FIELDS (@DANIELSFIELDS)
- 4. What if NoSQL? Map/Reduce (HBase, CouchDB)
- 5. What if NoSQL? Map/Reduce (HBase, CouchDB) Query DSL (MongoDB, ElasticSearch, ReThink)
- 6. What if NoSQL? Map/Reduce (HBase, CouchDB) Query DSL (MongoDB, ElasticSearch, ReThink) Key-Value (Redis, Membase)
- 7. What if NoSQL? Map/Reduce (HBase, CouchDB) Query DSL (MongoDB, ElasticSearch, ReThink) Key-Value (Redis, Membase) Other (Cypher, Pig Latin)
- 8. What if NoSQL? Map/Reduce (HBase, CouchDB) Query DSL (MongoDB, ElasticSearch, ReThink) Key-Value (Redis, Membase) Other (Cypher, Pig Latin) Uh…Structured Query Language…?
- 9. “No”SQL
- 11. SQL-like N1QL (Couchbase) SPARQL (RDF – AllegroGraph, BlazeGraph) CQL (Cassandra) …and so on…
- 12. No, seriously, what the heck is “NoSQL”?
- 13. No, seriously, what the heck is “NoSQL”?
- 14. So, then NoSQL === NoRel?
- 15. So, then NoSQL === NoRel?
- 16. NoSQL === (NoSQL !== RDBMS)
- 17. But why NoSQL?
- 18. NoSQL === (NoSQL !== RDBMS)
- 19. NoSQL solves specific problems
- 20. NoSQL solves specific problems Horizontal scalability
- 21. NoSQL solves specific problems Horizontal scalability Availability
- 22. NoSQL solves specific problems Horizontal scalability Availability Schema updates
- 23. NoSQL solves specific problems Horizontal scalability Availability Schema updates Performance
- 24. NoSQL solves specific problems Horizontal scalability Availability Schema updates Performance Data gets very large
- 25. NoSQL solves specific problems Horizontal scalability Availability Schema updates Performance Data gets very large Data gets very wide
- 26. NoSQL solves specific problems Horizontal scalability Availability Schema updates Performance Data gets very large Data gets very wide High volatility
- 27. NoSQL solves specific problems Horizontal scalability Availability Schema updates Performance Data gets very large Data gets very wide High volatility CPU-bound operations
- 28. “NoSQL” is not a monolith Key-value Document Graph Inverted Index Object RDF (triplestore/quadstore) Columnar
- 29. Key-value Description Pros Cons Examples Data is modeled as key-value pairs. • Simplicity • In-memory • Flexibility • Easy to partition • Limited query capabilities • Limited ability to build out complex data relationships • Redis • Couchbase • Membase • DynamoDB • Riak
- 30. Document Description Pros Cons Examples Data is represented as a “document,” and is serialized in a hierarchical data format. • Flexibility • Limited ability to build out complex data relationships • ArrangoDB • Couchbase • CouchDB • DynamoDB • ElasticSearch • MongoDB • RethinkDB • Riak
- 31. Graph Description Pros Cons Examples Based on graph theory. Data is represented as edges and vertices. • Data relationships are stored with the data itself at the logical level • Complexity • Apache Giraph • ArrangoDB • BlazeGraph • InfinitGraph • Neo4j
- 32. Inverted Index Description Pros Cons Examples An index that builds relationships between the contents of documents. Full- text indexes, and probability searches. • Flexibility • Robust querying • Mutations are slow • Requires a lot of storage • Probability searches may not be what you want. • ElasticSearch • Solr
- 33. Object Description Pros Cons Examples Models data as you would model them in an object- oriented language. • Automatic schema updates • Simplicity • Lightweight • Lack of standards • Lack of tooling • db4o • JADE • ObjectDB • Perst • Zope
- 34. RDF (triplestore/quadstore) Description Pros Cons Examples A type of graph database where vertices and edges are represented as semantic expressions. • Extremely scalable • Engines are incredibly fast • Complexity • AllegroGraph • BlazeGraph • MarkLogic • Oracle NoSQL
- 35. Columnar Description Pros Cons Examples Tabular data is stored by column instead of rows. A single table typically consists of many files. • Supports wide tables (100s of columns) • Aggregates on pico-scale data is fast • Write performance • Complexity • Mutations are a no-no • Cannot query by row • Accumulo • Cassandra • Druid • HBase • Vertica
- 38. Other considerations Multi-modal Approach to CAP theorem
- 39. Other considerations Multi-modal Approach to CAP theorem Memory management
- 40. Other considerations Multi-modal Approach to CAP theorem Memory management Durability
- 41. Other considerations Multi-modal Approach to CAP theorem Memory management Durability NewSQL
- 42. Thank you! Dan Fields Technologist, Liberty Mutual Insurance Twitter: @danielsfields GitHub: dsfields LinkedIn: /in/danielsfields
Hinweis der Redaktion
- The goal of this talk is provide a definition for the term “NoSQL,” and give a high-level overview of the various kinds of NoSQL databases.
- What NoSQL is and is not has caused confusion. There are a lot of options. NoSQL is not. A monolith. The name implies that these are database that do not use SQL to query data.
- Well, then how the heck are we getting data? There are a number of alternatives.
- Map performs filtering and sorting Reduce performs aggregates (counts, summations, unions, etc)
- Queries are objects built using a domain specific language. Different keys and structures result in different filter criteria and logical conjunctions/disjunctions.
- Gigantic hashtables. Simple hash lookup.
- Completely different languages for expressing queries.
- And of course there’s…SQL. But it’s called “NoSQL”!
- Are we just being trolled here? As it turns out, SQL is a pretty good tool. It makes it easy to build highly-complex queries and database mutations. Collectively a lot of knowledge about SQL within the development community.
- The term “NoSQL” has morphed from “there is no SQL” to “not only SQL.”
- We have this broad classification of databases. That are no SQL technologies. But also use SQL. It’s a bit confusing. What’s the difference between something like MySQL or PostgreSQL?
- What we start to find is that many of these technologies approach the modeling of data in dramatically different ways. There is often is no construct of a “relationship” as a first-class citizen in the database.
- Not exactly. The primitives for defining objects in a graph database are called vertices and edges. Edges are the relationship between vertices.
- Really, NoSQL is what it is not. That is, a database that is not an RDBMS.
- Perhaps at this point you may be saying, “yo, Dan, imma let you finish, but PostgreSQL is the greatest database of all time!”
- If you find that an RDBMS solves your problems, then use it. NoSQL is not an “alternative” to using RDBMS databases. Nor is NoSQL a panacea for data storage.
- The rise of these NoSQL database technologies has been about solving specific problems.
- Generally, scaling a traditional RDBMS means adding more disks, CPUs, and memory This can get costly, and has limitations Being able to simply add new nodes to a cluster to scale out a single database instance is compelling
- With RDBMS, if our database goes down, we have to fail over to a replica. Some NoSQL databases approach this problem by running hot-hot replicas. Traffic is simply routed away from an unhealthy node.
- If you have to change a database table, this can be a complicated exercise. Especially if you need to automate this as part of your continuous deployment pipeline. Some NoSQL technologies approach this by going ”schemaless.”
- Generally, RDBMS databases are pretty fast. There are situations where they are start to break down.
- Indexes begin to get difficult to manage and query.
- Many RDBS systems have a number of optimizations built into them that help it handle the efficient storage of data. Often the trade off is often limitations on the number of columns in a database.
- Lots of data mutations means lots of recomputing of indexes, and index fragmentation.
- CPUs tend to be the most limited resource on a server. Lots of CPU-intensive operations can result in the CPU getting pegged, which means your database is no longer available.
- Again, NoSQL databases solve specific problems. Consequently, there are a number of types of databases that often get associated with the “NoSQL” moniker. The different types are defined by the various ways a database will internally model data. They all have their pros and cons. Lets take a deeper look.
- Giant hashtable. Often in-memory. Typically used for caching Couchbase has additional methods of querying Redis has data structures DynamoDB has range keys
- Typically requires a fair amount of denormalization.
- The advantage of a graph database over an RDBMS is the ability to represent and query deeply-nested hierarchies.
- Typically associated with full-text indexes. Can be used as a document database. ElasticSearch offers additional, non-probably queries.
- This is a type of database that does not get a lot of publicity. The original “NoSQL” database (Strozzi).
- ”Humans are animals” / “Bob is human” / “Bob has hair” / “Bob is 35" / "Bob knows Fred” / “Sarah has hair” Engines are mind-bogglingly fast. BlazeGraph running on GPU servers has been clocked at 50 billion edge traversals per second Query language is SPARQL
- NO MUTATIONS! Often used for time series Typically stored in a tabular format
- This is a lot of information, so here’s some more!
- You may have noticed some databases appear on multiple NoSQL type lists. These are called multi-modal databases. Models data internally in multiple forms to overcome limitations of individual models.
- Consistency Availability Partition-tolerance. For example… CP gives you immediate consistency by running hot-cold replicas. This impacts availability because of warmup time for replicas. AP is the opposite.
- Some in-memory databases do not support larger-than-memory datasets with persistence (Redis).
- Eventually durable.
- There is another category worth mention here called NewSQL.