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 what’s under the hood?,[object Object],Aleksey Solntsev,[object Object]
The Digital Universe,[object Object]
Some facts,[object Object]
What’s they have in common?,[object Object],Performance,[object Object],Scalability,[object Object],Price,[object Object]
RDBMS,[object Object],ACID doesn’t scale well horizontally,[object Object],Shardingbreaks relations,[object Object], Joins are inefficient,[object Object],Transactions overhead,[object Object],Schema is not flexible,[object Object]
ACID,[object Object],[object Object]
Consistency
Isolation
Durability,[object Object]
We need to scale!,[object Object]
Replication aka RAID1,[object Object]
Sharding aka RAID0,[object Object]
CAP theorem (Brewer's theorem),[object Object]
ACID,[object Object],[object Object]
Consistency
Isolation
DurabilityBASE,[object Object],[object Object]
Soft State
Eventually Consistent,[object Object]
NoSQL Taxonomy,[object Object],Key Value / Tuple Store,[object Object],Eventually Consistent Key Value Store,[object Object],Wide Column Store / Column Families,[object Object],Document Oriented,[object Object],XML Databases,[object Object],Object Databases ,[object Object],Graph Databases,[object Object]
[object Object]
Designed to handle massive load,[object Object]
Partitioning 1/2,[object Object]
Partitioning 2/2,[object Object]
Primitive API,[object Object],CRUD,[object Object]
Map/Reduce for aggregation,[object Object],map(String filename, String document) {,[object Object],	List<String> T = tokenize(document);,[object Object],	for each token in T {,[object Object],		emit ((String)token, (Integer) 1);,[object Object],	},[object Object],},[object Object],reduce(String token, List<Integer> values) {,[object Object],	Integer sum = 0;,[object Object],	for each value in values {,[object Object],		sum = sum + value;,[object Object],	},[object Object],	emit ((String)token, (Integer) sum);,[object Object],},[object Object]
MapReduceи Hadoop?,[object Object]
[object Object]
Each rows can have different number of columns,[object Object]
SuperColumn,[object Object]
ColumnFamily,[object Object]
Keyspace,[object Object]

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NoSQL: what's under the hood?

Notes de l'éditeur

  1. UPAdding resources to a single node in a systemOUTAdd more nodes to a system
  2. master-master (no master)master-slaveStore the same data on multiple serversCan speedup queriesCan speedup writesDurability and availability
  3. Partitioning dataCan speed up read and writes