Efficient NoSQL database service Amazon dynamodb experience sharing

One 、 Preface

Amazon has always been very active , So it gave me a chance to experience Amozon DynamoDB This fully managed distributed NoSQL Database services . in addition , Amazon cloud technology provides 100 Free packages for more than products . among , Computing resources Amazon EC2 First year 12 It's free for three months ,750 Hours / month ; Storage resources Amazon S3 First year 12 It's free for three months ,5GB Standard storage capacity ; Database resources Amazon RDS First year 12 It's free for three months ,750 Hours ;Amazon Dynamo DB 25GB storage capacity Free forever . Active address

Amozon DynamoDB What is it? ？

Amazon DynamoDB It's a fully managed NoSQL Database services , Equivalent to the NoSQL On the basis of a lot of expansion , Many functions of cost reduction and efficiency increase are added , So that developers don't need to maintain anything extra , Open the box . Its main services are ： Seamless expansion , Fast and predictable performance , Reduce the tedious workload of managing distributed databases , Provide static encryption 、 Backup on demand 、 Automatically maintain expired items, etc . It can greatly reduce the time cost of developers and improve the construction efficiency .

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Maybe some little friends are not clear NoSQL Difference from traditional relational database , Here is a brief introduction ：

database	Data sets	structure	advantage
Relational database	form / Row and column storage	The structure of a relational database is predefined , Tables can be related to each other 、 Constraints etc. .	It can guarantee the security and integrity of data
NoSQL	Key value pair （ Dictionaries ） structure	In a non relational database , Data can be added at any time and anywhere . There's no need to predefine .	High expansibility 、 A smaller 、 Faster .

therefore , If the business relationship is not copied 、 The dependency is simple and the fields need to be modified frequently , High performance requirements but low security requirements , Use DynamoDB It's a very good choice . On the contrary, it is recommended to use such as mysql This kind of traditional relational database .

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Two 、Amozon DynamoDB Hands on Tutorial

1） Account registration

No, AWS Account partners need to register their accounts first ： Registration and trial address （ Domestic credit cards can be used on the bill registration page ）

2） Create and query NoSQL surface

2.1 Build table

After setting up an account , According to the official DynamoDB Use the tutorial You can quickly create NoSQL surface ：

2.2 Add data

There is a slight discrepancy with the official documents , You can actually do this by clicking on the name of the table in the list - Browse the project - Create a project to create , As shown in the figure below ：

2.3 Query data

Then click the run button （ You can also set filter criteria ） You can query the data we just added ：

2.4 Delete / Modifying data

Select any data in the list , It can be in the upper right corner “ operation ” Button to modify or delete data ：

If you need to delete the table , Select the corresponding table data in the outer table list , Click the delete button ：

3） Use Python management DynamoDB

We can also use Python To manage DynamoDB, Official documents There are detailed tutorials , No more details here .

4） Record on pit

stay 《 Use Amazon DynamoDB and Amazon SNS Build turn based games 》 tutorial , Follow the steps to application deployment , perform ：bash scripts/create-lambda.sh The command displays the error message in the following figure ：

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Follow the prompts to execute create-lambda.sh The file execution command is changed to nodejs14.x after , After deleting the newly created resource, the operation will be successful ：

There is also a green light behind , Completed the construction of turn based game .

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3、 ... and 、Amozon DynamoDB Description of characteristics

1）DynamoDB The partitioning key 、 Understanding of sorting keys

1.1 The partitioning key

When we build tables , Will let us designate zones to build ：

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What is the function of the partitioning key ？ Here is an example to illustrate ：

For example, there is such a ID number ：210122199206140257, From this ID number, you can quickly know that this is a person from Liaoning Province 、 Shenyang .、 A member of Liaozhong County 29 Year old boy .
Description of ID card format rules ： front 1-6 Bit is the administrative division code, i.e. the place of ownership , The first 7-14 Date of birth , The first 15-17 Bit is sequence code , People born in the same area are distinguished by serial numbers , The first 17 Odd number means male , Even numbers for women , The first 18 Bit is check code , Used to verify whether the ID card number is legal .
and DynamoDB The partitioning key of has the same function , Partition the data by specifying the identity , In this way, the query data will be significantly improved .

1.2 Sort key

The sort key allows us to store our data in a specified sort , In the subsequent data acquisition, the time complexity of the query can be reduced by means of binary search .

2）DynamoDB Secondary index of

In such as Mysql In relational databases such as , Indexing allows us to look up the data we want , Instead of scanning the entire table, query the data of the specified row range through the index , It's faster . After index creation , Let's modify the data of the table , The database automatically changes the index to map changes to the table , No need for us to operate it manually .

stay dynamodb How to implement similar operations in ？

We can create a secondary index to achieve a similar purpose ,DynamoDB Index and oracle,mysql The indexes of these relational databases are very different .DynamoDB The secondary index of is composed of a hash Keys and multiple range Key , It is essential to support the query patterns required by the application , About DynamoDB The use and introduction of the index can be accessed Manage index Document learning .

3）DynamoDB Backup and restore of

Data backup and rollback recovery are critical ,DynamoDB Fully automated on-demand backup 、 Restore and point in time recovery capabilities ：

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in addition , At the same time of backup , It also encrypts the data automatically , Cataloguing , To improve the efficiency of management , We can perform backup settings in the backup tab of the table details page ：

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You can also create one-time backups on demand ：

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You can also visit Cloud native database online conference Understand the history of database development , And the future development direction .

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Four 、 summary

DynamoDB In addition to providing data access management functions , In high availability （ Expand 、 Backup, etc ） We have also made a lot of efforts , There are also many out of the box services . therefore , It can not only ensure high-performance data access in the case of large-scale data , It can also reduce the construction, operation and maintenance costs of developers .
In game applications , news 、 It is necessary to send and receive notices , In addition, the performance requirements of game applications are much higher than those of traditional front and back-end applications , adopt Amazon DynamoDB and Amazon SNS The combination of , Can easily solve these two problems ：

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Of course DynamoDB There are also scenarios that do not apply ： In the early stages of product development , If there is no perfect and clear design scheme , Especially under the agile development mode of "step by step" , Not recommended DynamoDB, Because the DynamoDB Understanding of the document ： Only when you are familiar with the product itself , To design its partition 、 Sort key and so on . In other words , When the product is in a mature stage , Or you are familiar with the product , Use DynamoDB It can definitely get twice the result with half the effort .

Amazon cloud technology has created a variety of learning platforms for developers ：

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