Exam AWS Certified Developer Associate topic 1 question 55 discussion

(B) is correct. We are talking about 3 strong reads of 7KB. 7KB requires 2 RCUs, so 3 x 2 = 6. Regarding the writes, we are talking about 10 itens per second. 7KB requires 7 WCUs. So 10 x 7 = 70.

B is correct

B) Correct - Total Read Size 3*7 = 21 KB -- 4 KB by 1 RCU. 21 by approx 6 Total Write Size 70 KB --- 1 WCU per 1 KB = 70 WCU

B is the correct one because: - WCU = 10/1 * 7 ====> 70 - RCU (strongly consistent) = 3/4 * 7 = 5.25 ==> 6

B is correct

strongly consistent = 1 RCU per 4k, so 2 RCU per read and we have 3 per second, so 2x3=6 read capacity. Write uses 1k as its capacity, so 7k items will take 7 WCU, as we have 10 writes per second 10x7 = 70.

How is DynamoDB RCU calculated? 1 read capacity unit (RCU) = 1 strongly consistent read of up to 4 KB/s = 2 eventually consistent reads of up to 4 KB/s per read. 2 RCUs = 1 transactional read request (one read per second) for items up to 4 KB. For reads on items greater than 4 KB, total number of reads required = (total item size / 4 KB) rounded up. DynamoDB charges one WCU for each write per second (up to 1 KB) and two WCUs for each transactional write per second. This should help with calculations. Here we have strong read consistency. Its 1 RCU upto 4Kb. In our case its 7 Kb so we need 2 RCU. For write we need 7 WCU. Here as per the query its 3 reads/second so 3*2=6 and for writes 7*10=70

B 1 : Strong Read=4KB 7/4=1.7=2*3=6 2 : Write 7KB *10=70

Answer: B

Answer: B

Ans: B

It is B.

B is the correct answer .RCU=3*(7KB/4)=6 ,WCU=10*7KB=70

B... it correct see FHU answer.

B is correct

I go for B... RCU: 3 * 8 = 24.....24/4 = 6 WCU: 7 * 10 => 70

B item size 7kb to read each item with strong consisency we need 2 RCU to write each item we need 7 WCU max read rate = 3 items/sec which is 3*7 = 21kb in total and requires 6 RCU max write rate = 10 items/sec which is 10*7 70 kb in total and requires 70 RCU