1
00:00:00,700 --> 00:00:04,180
So let's have a first look at DynamoDB.

2
00:00:04,180 --> 00:00:07,040
And so DynamoDB allows us to create table.

3
00:00:07,040 --> 00:00:08,570
As you can see, I just click on create table

4
00:00:08,570 --> 00:00:09,530
and there's no such thing as

5
00:00:09,530 --> 00:00:10,970
creating a database. So right away,

6
00:00:10,970 --> 00:00:11,981
we have to create a table,

7
00:00:11,981 --> 00:00:14,230
which makes it a serverless database.

8
00:00:14,230 --> 00:00:17,050
So the table is going to be DemoTable.

9
00:00:17,050 --> 00:00:18,900
And here we have to choose what's called a partition key

10
00:00:18,900 --> 00:00:20,170
and optionally a sort key.

11
00:00:20,170 --> 00:00:21,790
And the combination of these two columns

12
00:00:21,790 --> 00:00:23,870
is going to make your primary key.

13
00:00:23,870 --> 00:00:26,950
So to make it very simple, I would just have user ID

14
00:00:26,950 --> 00:00:30,273
as my partition key, and I will not specify a sort key.

15
00:00:31,270 --> 00:00:32,990
Now for the settings. This is where it gets important

16
00:00:32,990 --> 00:00:34,900
from an exam perspective. So we're going to customize

17
00:00:34,900 --> 00:00:37,990
the settings to have a look at all the options we have.

18
00:00:37,990 --> 00:00:39,620
So, for read and write capacity settings,

19
00:00:39,620 --> 00:00:40,810
we have two options.

20
00:00:40,810 --> 00:00:43,780
We can either go on-demand or provisions.

21
00:00:43,780 --> 00:00:45,170
So on demand is very simple.

22
00:00:45,170 --> 00:00:46,999
We're going to pay for the actual reads and writes

23
00:00:46,999 --> 00:00:48,770
that your application will perform.

24
00:00:48,770 --> 00:00:51,020
And again, I said, this is great when your application has

25
00:00:51,020 --> 00:00:53,460
unpredictable workloads, because on-demand

26
00:00:53,460 --> 00:00:54,980
is two to three times more

27
00:00:54,980 --> 00:00:56,830
expensive than provision capacity.

28
00:00:56,830 --> 00:00:58,130
So use at your own risk obviously,

29
00:00:58,130 --> 00:01:01,160
but this can be a great case and a great fit for many

30
00:01:01,160 --> 00:01:02,120
kinds of scenarios.

31
00:01:02,120 --> 00:01:03,980
And this is what the exam will test you on.

32
00:01:03,980 --> 00:01:05,880
Now, provisioned is when you need to

33
00:01:05,880 --> 00:01:08,160
manage and optimize your cost by allocating

34
00:01:08,160 --> 00:01:09,930
read and write capacity in advance.

35
00:01:09,930 --> 00:01:11,970
So we have two options. We have read capacity,

36
00:01:11,970 --> 00:01:14,050
and write capacity. And so for these,

37
00:01:14,050 --> 00:01:15,740
we have either auto scaling, on and off.

38
00:01:15,740 --> 00:01:18,860
So auto-scaling applies to read and write capacity.

39
00:01:18,860 --> 00:01:20,010
So if we specified off,

40
00:01:20,010 --> 00:01:21,840
then we've provisioned capacity unit.

41
00:01:21,840 --> 00:01:22,990
So we can set, for example,

42
00:01:22,990 --> 00:01:24,734
I want to provision 10 capacity units,

43
00:01:24,734 --> 00:01:26,880
and for right capacity you can say,

44
00:01:26,880 --> 00:01:28,890
I want to provision five right capacity units. Okay.

45
00:01:28,890 --> 00:01:30,210
So that's one way of doing it.

46
00:01:30,210 --> 00:01:31,910
Or if we don't know ahead of time,

47
00:01:31,910 --> 00:01:33,740
what we'll need in terms of capacity,

48
00:01:33,740 --> 00:01:36,610
we can say, hey, min is max. Min is one.

49
00:01:36,610 --> 00:01:39,950
Max is 100 and I want a target utilization of 70%.

50
00:01:39,950 --> 00:01:42,890
And automatically auto-scaling activities will take place to

51
00:01:42,890 --> 00:01:44,840
manage your read capacity,

52
00:01:44,840 --> 00:01:48,410
to match about the 70% of the target utilization,

53
00:01:48,410 --> 00:01:51,670
which is true for read capacity and for write capacity.

54
00:01:51,670 --> 00:01:53,450
So I'm going to turn it off right now and I'll just set it

55
00:01:53,450 --> 00:01:56,380
to one and one, but it shows you these two very,

56
00:01:56,380 --> 00:01:58,840
very important options you need to know.

57
00:01:58,840 --> 00:02:01,300
Next we have indexes. And indexes I will discuss them

58
00:02:01,300 --> 00:02:04,780
in the next lecture, so let's skip them for now.

59
00:02:04,780 --> 00:02:07,740
And by the way, if you want to know how to find out

60
00:02:07,740 --> 00:02:09,889
which read and write capacity is right for you,

61
00:02:09,889 --> 00:02:11,140
there's a capacity calculator.

62
00:02:11,140 --> 00:02:12,270
Now this is a bit more complex.

63
00:02:12,270 --> 00:02:14,320
This is more relevant for the developer exam.

64
00:02:14,320 --> 00:02:16,170
So I'm not going to go over it.

65
00:02:16,170 --> 00:02:17,290
Okay.

66
00:02:17,290 --> 00:02:18,750
So we're going to scroll down.

67
00:02:18,750 --> 00:02:23,200
So as you can see, because we have one RCU and one WCU,

68
00:02:23,200 --> 00:02:25,760
we have an estimated cost of 71 cents

69
00:02:25,760 --> 00:02:27,100
per month for this table.

70
00:02:27,100 --> 00:02:28,910
So this gives you information around the

71
00:02:28,910 --> 00:02:30,490
pricing of DynamoDB.

72
00:02:30,490 --> 00:02:33,660
Okay, now we will enable encryption at rest,

73
00:02:33,660 --> 00:02:36,443
and then I will click on create table.

74
00:02:38,160 --> 00:02:41,250
So now that my table is created, I can click on it.

75
00:02:41,250 --> 00:02:42,730
And then on the right hand side,

76
00:02:42,730 --> 00:02:44,600
I can have a look at view items.

77
00:02:44,600 --> 00:02:46,120
And this is just to show you how we can

78
00:02:46,120 --> 00:02:48,640
insert items into our DynamoDB table.

79
00:02:48,640 --> 00:02:50,470
So as we can see, you can create an item.

80
00:02:50,470 --> 00:02:52,860
And when you specify a user ID, for example,

81
00:02:52,860 --> 00:02:54,840
stephane under score 1 2 3,

82
00:02:54,840 --> 00:02:57,750
and then we can start adding attributes into this table.

83
00:02:57,750 --> 00:03:01,380
So we can say, name is Stephane Maarek.

84
00:03:01,380 --> 00:03:04,843
And then we can have an example around another one,

85
00:03:04,843 --> 00:03:07,513
for example, favorite movie,

86
00:03:09,180 --> 00:03:13,453
and you can say Memento, and then it may be a number.

87
00:03:14,540 --> 00:03:15,650
Favorite number...

88
00:03:17,280 --> 00:03:18,113
42.

89
00:03:18,113 --> 00:03:20,130
Okay. And we're going to create this item.

90
00:03:21,690 --> 00:03:23,000
And as you can see, now, the item has been

91
00:03:23,000 --> 00:03:24,470
inserted into my table.

92
00:03:24,470 --> 00:03:25,880
So it's quite easy to reason about,

93
00:03:25,880 --> 00:03:27,820
and we can create another item, obviously.

94
00:03:27,820 --> 00:03:31,010
We can say Alice 4 5 6,

95
00:03:31,010 --> 00:03:33,160
and again, we can set the name

96
00:03:33,160 --> 00:03:36,830
of Alice to be Alice Doe.

97
00:03:36,830 --> 00:03:38,440
And then we can just say

98
00:03:40,440 --> 00:03:41,710
favorite...

99
00:03:41,710 --> 00:03:45,150
movie and then Pocahontas.

100
00:03:45,150 --> 00:03:46,120
Okay, great.

101
00:03:46,120 --> 00:03:49,300
So I will create this item and maybe we can add also a

102
00:03:49,300 --> 00:03:51,860
number called age in here.

103
00:03:51,860 --> 00:03:53,419
I will say...

104
00:03:53,419 --> 00:03:54,890
23.

105
00:03:54,890 --> 00:03:56,340
Okay. Let's create this item.

106
00:03:58,190 --> 00:03:59,730
So as you can see, in this example,

107
00:03:59,730 --> 00:04:03,120
I specify different attributes for Alice, then Stephane.

108
00:04:03,120 --> 00:04:04,780
And the idea is that in DynamoDB,

109
00:04:04,780 --> 00:04:06,410
you don't need to have all the

110
00:04:06,410 --> 00:04:07,960
attributes filled out for all the items.

111
00:04:07,960 --> 00:04:10,390
Actually, every item can have different attributes.

112
00:04:10,390 --> 00:04:13,340
So this show you the whole power of DynamoDB table,

113
00:04:13,340 --> 00:04:17,630
and no SQL type of technology versus SQL type of technology.

114
00:04:17,630 --> 00:04:18,463
So it's very simple.

115
00:04:18,463 --> 00:04:20,807
Now we have Alice and Stephane in our table,

116
00:04:20,807 --> 00:04:22,900
and I'm not going to go too deep into DynamoDB.

117
00:04:22,900 --> 00:04:25,160
As you can see, there are a lot of options.

118
00:04:25,160 --> 00:04:26,900
So if we go back into our table,

119
00:04:26,900 --> 00:04:30,680
there are a lot of options in here available to us.

120
00:04:30,680 --> 00:04:31,810
But in the next lecture,

121
00:04:31,810 --> 00:04:34,460
what I will do is I will describe what are some of these

122
00:04:34,460 --> 00:04:36,860
options that can be important for the exam are.

123
00:04:36,860 --> 00:04:39,290
And what you need to see just in this lecture was how to set

124
00:04:39,290 --> 00:04:41,680
the read and write capacity units or the on-demand mode,

125
00:04:41,680 --> 00:04:45,040
as well as inserting some data into the DynamoDB table.

126
00:04:45,040 --> 00:04:46,010
So I hope you liked it,

127
00:04:46,010 --> 00:04:48,450
and I will see you in the next lecture.