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DynamoDB Adjacency List Pattern


DynamoDB Adjacency List Pattern

By : G Narra
Date : October 24 2020, 06:10 AM
will help you No, no additional queries - unless you ask ("project") only certain attributes, your query will retrieve all the attributes of the bills together with its key.
DynamoDB stores each partition together on a single node, so it's efficient to fetch the entire partition. This partition is defined by its "partition key" (your invoice number). The partition contains a bunch of "items" (your bills), each item has its own "sort key" (your bill ID) and any number of "attributes". When DynamoDB reads the partition, it reads those items in order, with all their attributes, and can return all of them unless you specifically asked it not to. Note that even if you ask it only to return a subset (a "projection") of these attributes, Amazon still needs to read them from disk, and you will still pay for this I/O.
code :


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Create adjacency matrix from nearest neighbour search. (convert adjacency list to adjacency matrix) - Matlab

Create adjacency matrix from nearest neighbour search. (convert adjacency list to adjacency matrix) - Matlab


By : shwetaqwe
Date : March 29 2020, 07:55 AM
Hope that helps I have a matrix 2000x5, in the first column the point number, and in columns 2-5 the 4 neighbours (0s if there isnt a neighbour). Is there an efficient way to create an adjacency matrix out of this ? , A quick and simple technique:
code :
adjMat = zeros(size(A,1));
for ind = 1:size(A,1)
    % Flag 1 on each row 'ind' at the indices mentioned in col 2-5
    adjMat(ind, nonzeros(A(ind,2:end))) = 1;
end
A = [1 2 3; 2 0 1; 3 1 4; 4 5 3; 5 4 0]

A =

 1     2     3
 2     0     1
 3     1     4
 4     5     3
 5     4     0
adjMat =

 0     1     1     0     0
 1     0     0     0     0
 1     0     0     1     0
 0     0     1     0     1
 0     0     0     1     0
adjMat(nonzeros(A(ind,2:end)),ind) = 1;
DynamoDB adjacency list primary key

DynamoDB adjacency list primary key


By : user1387941
Date : March 29 2020, 07:55 AM
wish help you to fix your issue Basic guidelines for an adjacency-list
You need a few modifications to the way you're modeling. In an adjacency-list you have two types of items:
code :
PRIMARY-KEY   | SORT-KEY    | SOURCE DATA  | TARGET DATA
--------------|-------------|--------------|-------------
Post-1        | Post-1      | hello world  |
Post-2        | Post-2      | foo bar      |
Post-3        | Post-3      | Whatever...  |
Tag-1         | Tag-1       | cool         |
Tag-2         | Tag-2       | awesome      |
Tag-3         | Tag-3       | great        |
Post-1        | Tag-1       | hello world  | cool
Post-2        | Tag-1       | foo bar      | cool
Post-2        | Tag-3       | foo bar      | great
Tag-1         | Post-1      | cool         | hello world
Tag-1         | Post-2      | cool         | foo bar
Tag-3         | Post-2      | great        | foo bar
DynamoDB M-M Adjacency List Design Pattern - Delete all associations?

DynamoDB M-M Adjacency List Design Pattern - Delete all associations?


By : Alan Engel
Date : March 29 2020, 07:55 AM
I hope this helps you . The adjacency list design pattern requires you to query the GSI and/or table to find everything that is related. Only once you know all the associations can you delete them.
How to query an n:n adjacency list map in DynamoDB without using scan

How to query an n:n adjacency list map in DynamoDB without using scan


By : Joe Stenhouse
Date : March 29 2020, 07:55 AM
help you fix your problem In that case, you can have the PK be the type of the object and the SK be a uuid. A record would look like this { PK: "Catalog", SK: "uuid", ...other catalog fields }. You can then do a get all catalogs by doing a query on the PK = Catalog.
To store the associations you can have a GSI on two fields sourcePK and relatedPK where you could store records that associate things. To associate an object you would create a record like e.g. { PK: "Association", SK: "uuid", sourcePK: "category-1", relatedPK: "collection-1", ... other data on the association }. To find objects associated with the "Catalog" with id 1, you would do a query on the GSI where sourcePK = catalog-1.
DynamoDB M-M Adjacency List Design Pattern

DynamoDB M-M Adjacency List Design Pattern


By : Nolij
Date : March 29 2020, 07:55 AM
this will help In the first picture you posted the items in the base table (primary key) would look like this:
code :
First_id(Partition key)        Second_id(Sort Key)          Dated
-------------                   ----------                  ------
Invoice-92551                   Invoice-92551               2018-02-07
Invoice-92551                   Bill-4224663                2017-12-03
Invoice-92551                   Bill-4224687                2018-01-09
Invoice-92552                   Invoice-92552               2018-03-04
Invoice-92552                   Bill-4224687                2018-01-09
Bill-4224663                    Bill-4224663                2018-12-03
Bill-4224687                    Bill-4224687                2018-01-09
Second_id(Partition Key)       First_id
----------                     ---------------
Invoice-92551                  Invoice-92551 
Bill-4224663                   Invoice-92551 
Bill-4224687                   Invoice-92551 
Invoice-92552                  Invoice-92552
Bill-4224687                   Invoice-92552
Bill-4224663                   Bill-4224663
Bill-4224687                   Bill-4224687 
ProductID(Partition Key) TypeID(Sort Key)  Title          Name      
---------                ------            ------         ------
Album1                   Album1            Dark Side
Album1                   Album1:Track1     Speak to me
Album1                   Album1:Track2     Breathe
Movie8                   Movie8            Idiocracy
Movie8                   Movie8:Actor1                    Luke Wilson
Movie8                   Movie8:Actor2                    Maya Rudolph
Partition key: Album1
Partition key: Album1 and Sort Key: Album1:Track2
Partition key: Movie8
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