tecnologia dei db server 1

Fragmentation Types

Horizontal

•

Vertical

•

1

Transparency Levels

• Fragmentation Transparency

• Allocation Transparency

• Language Transparency

• No Transparency

2

Football PlayersConsider the database fragmented according to the Country where a team belongs:

PLAYER ( Name, Team, Country, Role )

GOAL ( PlayerName, GameDate, Minute, GoalType, Description )

The GOAL table describes the goals scored by the various players during their career and has a fragmentation which is derived from that of PLAYER. Assume that names identify players.

Describe at the three transparency levels the required SQL statements for changing the player's team. Assume that you know the player's name and the destination team and country, while his role is unchanged.

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Two different cases

(a) The old and new team are in the same country

(b) The old and new team are in different countries

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(a) Marco Borriello Milan -> Rome

(b) Zlatan Ibrahimovich Barcelona -> Milan

Two different cases



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Borriello Milan -> Rome

upadate Playerset Team = “Rome”where name = “Marco Borriello” // Fragmention transparency

upadate ItalianPlayerset Team = “Rome”where name = “Marco Borriello” // Allocation transparency

Two different cases



6

Borriello Milan -> Rome

upadate Playerset Team = “Rome”where name = “Marco Borriello” // Fragmention transparency

upadate ItalianPlayerset Team = “Rome”where name = “Marco Borriello” // Allocation transparency

Two different cases



7

Zlatan Ibrahimovich Barcelona -> Milan

upadate Playerset Team = “Milan”where name = “Zlatan Ibrahimovich” // Fragmention transparency

Allocation transparency ?

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create table GoalsScoredEverSinceByPlayersCurrentlyEnrolledInItaly( PlayerName varchar(50) references Player(Name) on update cascade on delete no action ... )

create table GoalsScoredEverSinceByPlayersCurrentlyEnrolledInSpain( PlayerName varchar(50) references Player(Name) on update cascade on delete no action ... )

Insert Zlatan’s data into ItalianPlayer

Insert all of Zlatan’s goals into the italian goal record (taken from the spanish one) -> Goals..Italy

Delete goals from the Goals..Spain table

Delete Zlatan from SpanishPlayer

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insert into ItalianPlayer select Name, ‘Milan', ‘Italy', Role from SpanishPlayer where Name = ‘Zlatan Ibrahimovic'

insert into Goals..Italy select * from Goals..Spain where PlayerName = ‘Zlatan Ibrahimovic‘

delete from Goals..Spain where PlayerName = ‘Zlatan Ibrahimovic‘

delete from SpanishPlayerwhere Name = ‘Zlatan Ibrahimovic‘

10

L

Consider the data base:

Production(SerialNumber,PartType,Model,Quantity,Machine)

Pickup(SerialNumber,Lot,Customer,SalesPerson,Amount)

Customer(Name,City,Address)

SalesPerson(Name,City,Address)

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Design the horizontal fragmentation of the table Production and Pickup depending on the PartType value (‘Keyboard’, ‘Screen’, ‘CPU-box’ e ‘Cable’), assuming four Production centres (one for each component) located in Milan, Turin, Rome and Naples, and of Customer and SalesPerson on three Cities: Milan, Turin, Rome.

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The distributed DB contains the following tables

ProductionMiKbr(SerialNumber,PartType, Model,Quantity,Machine) ProductionToScr(SerialNumber,PartType, Model,Quantity,Machine)ProductionRmCpu(SerialNumber,PartType, Model,Quantity,Machine)ProductionNaCbl(SerialNumber,PartType, Model,Quantity,Machine)

Production = ProductionMiKbr ProductionToScr ProductionRmCpu ProductionNaCpl

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PickupMiKbr(SerialNumber,Lot,Client,SalesPerson,Amount)

PickupToScr(SerialNumber,Lot,Client,SalesPerson,Amount)

PickupRmCpu(SerialNumber,Lot,Client,SalesPerson,Amount)

PickupNaCbl(SerialNumber,Lot,Client,SalesPerson,Amount)

Pickup = PickupMiKbr PickupToScr PickupRmCpu PickupNaCpl

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ClientMi(Name,City,Address)ClientTo(Name,City,Address)ClientRm(Name,City,Address)

Client = ClientMi ClientTo ClientRm

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SalesPersonMi(Name,City,Address)SalesPersonTo(Name,City,Address)SalesPersonRm(Name,City,Address)

SalesPerson = SalesPersonMi SalesPersonTo SalesPersonRm

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Express the following queries at transparency levels of fragmentation, allocation and language:

Determine the available quantity of the product ’77Y6878’

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Transparency of fragmentation

SELECT QuantityFROM ProductionWHERE SerialNumber=’77Y6878’

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Transparency of allocationSELECT Quantity FROM ProductionMiKbrWHERE SerialNumber=’77Y6878’ UNION SELECT Quantity FROM ProductionToScr WHERE SerialNumber=’77Y6878’ UNION SELECT Quantity FROM ProductionRmCpu WHERE SerialNumber=’77Y6878’ UNION SELECT Quantity FROM ProductionNaCbl WHERE SerialNumber=’77Y6878’)

19

Transparency of allocationSELECT Quantity FROM ProductionMiKbrWHERE SerialNumber=’77Y6878’IF :empty then (SELECT Quantity FROM ProductionToScr WHERE SerialNumber=’77Y6878’ UNION SELECT Quantity FROM ProductionRmCpu WHERE SerialNumber=’77Y6878’ UNION SELECT Quantity FROM ProductionNaCbl WHERE SerialNumber=’77Y6878’)

20

Transparency of languageSELECT Quantity FROM ProductionMiKbr@MilanWHERE SerialNumber=’77Y6878’SELECT Quantity FROM ProductionToScr@Turin WHERE SerialNumber=’77Y6878’ UNION SELECT Quantity FROM ProductionRmCpu@Rome WHERE SerialNumber=’77Y6878’ UNION SELECT Quantity FROM ProductionNaCbl@Naples WHERE SerialNumber=’77Y6878’

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Determine the clients who have bought a lot from the SalesPerson ‘Bianchi’, who has an office in Rome

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SELECT Customer FROM PickupWHERE SalesPerson=‘Bianchi’

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Transparency of allocation

SELECT Client FROM PickupMiKbrWHERE SalesPerson=‘Bianchi’unionSELECT Client FROM PickupToScrWHERE SalesPerson=‘Bianchi’unionSELECT Client FROM PickupRmCpuWHERE SalesPerson=‘Bianchi’unionSELECT Client FROM PickupNaCblWHERE SalesPerson=‘Bianchi’

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Transparency of language

SELECT Client FROM PickupMiKbr@MilanWHERE SalesPerson=‘Bianchi’unionSELECT Client FROM PickupToScr@TurinWHERE SalesPerson=‘Bianchi’unionSELECT Client FROM PickupRmCpu@RomeWHERE SalesPerson=‘Bianchi’unionSELECT Client FROM PickupNaCbl@NaplesWHERE SalesPerson=‘Bianchi’

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Determine the machines used for the production of the parts type ‘Keyboard’ sold to the Customer ‘Rossi’

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SELECT MachineFROM Production P1 JOIN Pickup P2 ON (P1.SerialNumber=P2.SerialNumber)WHERE Client = ‘Rossi’ AND PartType = ‘Keyboard’

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Transparency of allocationThis time the query is easier because only one fragment is totally dedicated to components of type ‘Keyboard’

SELECT MachineFROM ProductionMiKbr P1 JOIN PickupMiKbr P2 ON (P1.SerialNumber=P2.SerialNumber)WHERE Client = ‘Rossi’

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Also this query is easier because only one fragment is totally dedicated to components of type ‘Keyboard’

SELECT MachineFROM ProductionMiKbr@Milan P1 JOIN PickupMiKbr@Milan P2 ON (P1.SerialNumber=P2.SerialNumber)WHERE Client = ‘Rossi’

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Update the Address of SalesPerson ‘Rossi’, moving from ‘via Po 45’ in ‘Milan’ to ‘Viale Trastevere 150’ in Rome’ (ignore the moving of related data in other tables)

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UPDATE SalesPersonSET City = ‘Rome’, Address=‘VialeTrastevere 150’WHERE Name = ‘Rossi’

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Delete followed by an Insert

DELETE FROM SalesPersonMiWHERE Name = ‘Rossi’

Insert INTO SalesPersonRmVALUES(‘Rossi’, ‘Rome’,

‘Viale Trastevere 150’)

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Delete followed by an Insert

DELETE FROM SalesPersonMi@MilanWHERE Name = ‘Rossi’

Insert INTO SalesPersonRm@RomeVALUES(‘Rossi’, ‘Rome’,

‘Viale Trastevere 150’)

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Calcolate the sum of amounts of the orders received in Milan, Turin, Rome and Naples (note that the aggregate functions are also distributable)

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SELECT SUM(Amount)FROM Pickup

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We need to identify the contribute of each fragment.

To do a sum of sums it is necessary to use a view.

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CREATE VIEW TotalAm(Tot) ASSELECT SUM (Amount)FROM PickupMiKbrUNION ALLSELECT SUM (Amount)FROM PickupToScrUNION ALLSELECT SUM (Amount)FROM PickupRmCpuUNION ALLSELECT SUM (Amount)FROM PickupNaCbl

SELECT SUM(Tot) FROM TotalAm

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Transparency of languageCREATE VIEW TotalAm(Tot) ASSELECT SUM (Amount)FROM PickupMiKbr@MilanUNION ALLSELECT SUM (Amount)FROM PickupToScr@TurinUNION ALLSELECT SUM (Amount)FROM PickupRmCpu@RomeUNION ALLSELECT SUM (Amount)FROM PickupNaCbl@Naples

SELECT SUM(Tot) FROM TotalAm

tecnologia dei db server 1

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