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„NoSQL, NewSQL, … Status Quo, Newcomers and some Future Predictions““
StefanEdlich
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BOOKS #1 WEBSITE
3y+ ConsultantCONFERENCES
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1. Where are we? 2. What‘s new?
3. Some predictions for the future?
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July 2012
[
[[
[
[ [
in 2009 „In the next years we will see a consolidation and many databasesand DB companies will die!“
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db-engines.com
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Expanding Universe…
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In 5-N years…DBs like the smartphone market
„excessivefeatureexchange“
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analogy Programming Languages
multicoreno state
:- use_module(library(clpfd)).sudoku(Rows) :-length(Rows, 9), maplist(length_(9), Rows),append(Rows, Vs), Vs ins 1..9,maplist(all_distinct, Rows),transpose(Rows, Columns), maplist(all_distinct, Columns),Rows = [A,B,C,D,E,F,G,H,I],blocks(A, B, C), blocks(D, E, F), blocks(G, H, I).length_(L, Ls) :- length(Ls, L).blocks([], [], []).blocks([A,B,C|Bs1], [D,E,F|Bs2], [G,H,I|Bs3]) :-all_distinct([A,B,C,D,E,F,G,H,I]),blocks(Bs1, Bs2, Bs3).
OOP
logicfunctional
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Language'/'ProgrammingParadigm
DatabaseParadigm
Logic:'rule'based'deduction declarative'queryingabstract'query'composition
Functional:'immutability MVCC,'append'only,'SSD'ready„single'source'of'truth“
OO'/'Imperative uncontrolled'statemanipulation
composition, abstractness
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new Ideas & Newcomers
Part II
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Search
ScalingMonster
Multi0modelDBs
RAM? SSD?Disk?
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„The amount ofMultimodel-Databases
will increase dramatically!“
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Microsoft Trinity?IBM RDF Store?!Object-Databases?
SAP Hana Graph Engine
2nd$Iteration
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V 9.3+ new Parser
JSON tables,KV
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postgres=# SELECT json_agg(aa) FROM aa;Access JSON Objects: -> and ->>condense fields with: #> and #>>
http://www.postgresql.org/docs/devel/static/functions7json.html
=> json array
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Example: Handler Socket first 2010, now 2013 Oracle / MySQL
Relational
JSON Graph KV ColumnS
Multimodel-Databases
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Premise: Atoms
inducible to MultimodelDBs
Labs do work on: DB Personalities!
K/V rebirth?!
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Polyglot inside
„Yes I can!“ 2-N Models
DB#1Model#1
DB#2#Model#2 DB#3Model#3
Polyglot outside + Polyglot inside
Polyglot outside
Polyglot inside
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! Atoms => Datomic!
! Clojure Principles, 2-3 persons, 2 years work
! Immutable Data MVCC, replay, compare DBs, historyjuggling (query „as of“ or „time-windows“)
! Nathan Marz: „Single Source of Truth…“
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! ACID LAYER! unlimited read scalability
e.g. with DynamoDB! Full-Text Search! Smart Caching / Data Gravity
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! minimal Schema / Metadata! has cardinality! references are „bi“ by default,
=> graph ‚alike‘ queries Stuart Halloway „The impedance mismatch is our fault“
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! Datalog + Queries!! Rectangulation of Data! Place Oriented Programming
P unification (MGU) + logic capabilitiesP Code as Data
©
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! lessons from Cascalog ! logic querying! recursive rules / queries! implicit joins
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! abstractions + composability!
©
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Search
ScalingMonster
Multi0modelDBs
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Redshift DynamoDB
• SSD• no maintanance• zone replication• backup & restore to S3• 40 mio requests free• …
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• JSON over http or PotoBuf Interface• ACID Transactions• Partially strong or eventual consistent• Multi Datacenter• No downtime• Autoscale• 0.09$ write, 0,0´6$ read per 100k ops
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SSD?
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Pattern: write once + append only
RAM – SSD – Disk
Jim Gray, … & Götz Gräfe„The 5 Minute Rule for Disc Access and the 5 Byte Rule
forTrading Memory for CPU Time“ 1987, 1997, 2007
Datomic, Lucene 4 / ElasticSearch, DynamoDB,…
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BreakEvenInSeconds = (PagesPerMBofRAM / AccessesPerSecondPerDisk)x
(PricePerDiskDrive / PricePerMBofRAM)
4k100b 1k
400sec
200sec hold.in.RAM
hold.in.Disk
1987,.1997:.1K,.<400sec.=>.RAM
• Hybrid Disks?!• Slow vs. Fast Write SSDs?!• Rule valid only for big blocks• 5248 sec for 4k blocks
• 5M: big blocks: Ram -> Flash• 5M: small blocks: RAM -> Disk
! 100.000 erase-write cycles: no problem! important: energy efficiency! append-only fits to‚ wear-leveling‘
• Access Time and Access Patterns "
# Flash 2007: 1000$ for 32GB
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hot fast medium low archive delete!
Register ! L1 ! L2 ! RAM ! SCM: PCM? ! SSD ! Disk ! Tape !/dev/null
RAM ! SSD !Disk
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Spanner
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Jeff Dean 2009:•many Exabyte (10^18)•millions of machines•around the globe
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• protobuf encoded columns• extended SQL syntax
• logically denormalized, physically one Objekt
CREATE TABLE Users { uid INT64 NOT NULL, email STRING } PRIMARY KEY (uid), DIRECTORY; CREATE TABLE ALBUMS { uid INT64 NOT NULL, aid INT64 NOT NULL, name STRING} PRIMARY KEY (uid, aid), INTERLEAVE IN PARENT Users ON DELETE CASCADE;
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„Time synchronisation on this levelis not possible!“
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True-Time API: 1-7ms
GPS-Antennas & Atomic-Clocks„An atomic clock is not that expensive!”
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Paxos wait minimal for RW-Transactions!
!| 2ɛ |"tcom
!| |"
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a dozen truly global databases till 2018
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How to ……tie up the loose ends?!
Part III
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http://nosql-database.org
> 75% relational fit!
+ Prototype
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Speed•High*Latency*updates•Incremental*algorithms
Serving•Updates*vom*Batch*Layer•Random*Access
Batch•Source*/*„Source*of*Truth“•Views
Architecture Vision - z.B.
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Mainframe Client,Server Data,Center Web22.0 Big,Data
Architecture
Paradigm Shiftx10 more expensive!
early adopters win
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Executive Summary:
komplex(„DB,Smartphone,
Mash“
Immutability! MVCC! SSD
radikalnewideasall(over(Datomic)
Multimodel(&Global
Databases
newArchitectures(&
Checklists
5 min rule
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Thanks!contact [email protected] http://edlich.de