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Keynote for the italian nosql day, I have tried to explain the meaning of the word "nosql" through an historical path
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I’am going to tell you what
is this
thing...
SQL
SQLis not aboutrejecting
sql/relationaldatabases
SQLis not aboutembracingnon sql/
non relationaldatabases
then what is this all about?
let me tell you a story...
Hype cycle of technologyVisib
ility
maturity
technologytrigger
peak ofinflated
expectation
disillusionment
productivity
obsolescence
Visib
ility
maturity
technologytrigger
disillusionmentleads to
Hype cycle of technology
Visib
ility
maturity
but sometimes they come back
Visib
ility
maturity
volume => longevity (legacy)
new ideasare made ofold ideasapplied in
a differentcontext
an example
an example
an example
an example
???probably
somethingin between
All of this has happened before, and it will all happen
again...
ok, but this is the
nosql day!what are
you trying to say?
we should start from the beginning...
ui
busin
ess
storag
e• single user• data owned by applications• custom solution
dbms: the beginning
ui
busin
ess
storag
e
• every applications needs to develop his own solution...
dbms: the beginning
ui
busin
ess
lib
rary
• more robust solution
dbms: first libraries
FirstNode.SecondNode.attribute
FirstNodeat
trib
ute
SecondNode
attr
ibut
e
dbms: first libraries(navigational databases)
dbms: first libraries(navigational databases)
FirstNode.SecondNode.attribute
FirstNodeat
trib
ute
SecondNode
attr
ibut
e
• cobol: banking• m/mumps: health care
dbms: first libraries(key value databases)
RecordKey
attr
ibut
eRecordKey
attr
ibut
e
RecordKey
attr
ibut
e
RecordKey
attr
ibut
e
dbms: first libraries(key value databases)
RecordKey
attr
ibut
eRecordKey
attr
ibut
e
RecordKey
attr
ibut
e
• dbm: ken thompson-> QDBM-> tokyo cabinet
dbms: relational model
rdbms
business
network
application
application
application
• system-r• ingres -> postgres
• sybase• informix
dbms: relational model
rdbms
business
network
application
application
application
duplicated business logic
who is the data’s owner?
-
(mrtg/rrd)
rela
tional
navigational
tim
e
object.
oriented
network
key ->
value
(ldap
/ad)docum
ent
.
orie
nted
colum
n
orient
ed
dbms: relational server
rd
bm
s
application
application
application
busin
ess
• consistency• security• integrity• validity
dbms: relational server
rd
bm
s
application
application
application
busin
ess
relational model as a (declaratively) programmable business logic
rise the data driven design
impedance mismatch
cost o
f im
plem
entatio
n
context
purpose
dbms: relational model
rdbms
business
network
application
application
application
duplicated business logic
who is the data’s owner?
dbms: service oriented
application
application
application
network
dbms: service oriented
application
application
network
ROA: an architectural style where applications are responsible to deliver a service to the network (aka users and other applications)
SQLis not aboutrejecting
sql/relationaldatabases
SQLis about
rejectingthe notion
that there isone true and
centralized wayto store anykind of data
what about the future?
storagefor morespecific
data
what about the future?
knowledgeextraction
what about the future?
“REAL”relationaldatabases
Questions?
