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1065 high scalability-2011-06-21-Running TPC-C on MySQL-RDS


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Introduction: I recently came across a TPC-C benchmark results held on MySQL based RDS databases. You can see it here . I think the results may bring light to many questions concerning MySQL scalability in general and RDS scalability in particular. (For disclosure, I'm working for ScaleBase where we run an internal scale out TPC-C benchmark these days, and will publish results soon). TPC-C TPC-C is a standard database benchmark, used to measure databases. The database vendors invest big bucks in running this test, and showing off which database is faster, and can scale better. It is a write intensive test, so it doesn’t necessarily reflect the behavior of the database in your application. But it does give some very important insights on what you can expect from your database under heavy load. The Benchmark Process First of all, I have some comments for the benchmark method itself. Generally - the benchmarks were held in an orderly fashion and in a rather methodological way – which i


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1 I recently came across a TPC-C benchmark results held on MySQL based RDS databases. [sent-1, score-0.641]

2 (For disclosure, I'm working for ScaleBase where we run an internal scale out TPC-C benchmark these days, and will publish results soon). [sent-4, score-0.559]

3 The database vendors invest big bucks in running this test, and showing off which database is faster, and can scale better. [sent-6, score-0.521]

4 The Benchmark Process First of all, I have some comments for the benchmark method itself. [sent-9, score-0.41]

5 The benchmark generator client was tpcc-mysql which is an open-source implementation provided by Percona. [sent-11, score-0.473]

6 The TPC-C benchmark contains 6 types of transactions (“new order”, “delivery”, “stock query”, etc. [sent-14, score-0.495]

7 The benchmark focused on throughput, not latency. [sent-16, score-0.41]

8 That’s usually a small database, and I would be interested in seeing how the benchmark ranks with 1000 warehouses (around 100 GB) or even more. [sent-21, score-0.583]

9 Results Analysis The benchmark results are surprising. [sent-24, score-0.559]

10 With hardly any dependency on the database size, MySQL reaches its optimal throughput at around 64 concurrent users. [sent-25, score-0.76]

11 The sweet spot is around the XL machine, which reaches a throughput of around 7000 tpm. [sent-29, score-0.44]

12 Well we saw that optimal throughput is achieved with around 64 concurrent sessions on the database. [sent-40, score-0.508]

13 While with 1 user the throughput 1,000 transactions per user, with 256 users it drops to 1 transaction per user! [sent-42, score-0.501]

14 For each query, the database needs to parse, optimize, find an execution plan, execute it, and manage transaction logs, transaction isolation and row level locks. [sent-47, score-0.745]

15 A simple update command needs an execution plan to get the qualifying rows to update and then, reading those rows, lock each and every row. [sent-49, score-0.563]

16 Meaning that the user’s result must be the snapshot of the query as it was when the query started. [sent-57, score-0.416]

17 Rather, the database should go and find the “old snapshot” of the row, meaning the way the row looked at the beginning of the query. [sent-59, score-0.464]

18 When sessions or users concurrency goes up, load inside the database engine increases exponentially. [sent-64, score-0.41]

19 There are allot of possible solutions to this problem – adding a caching layer is a must, to decrease the number of database hits, and any other action that can reduce the number of hits on the database (like NoSQL solutions) is welcomed. [sent-69, score-0.721]

20 Instead of 128 concurrent users or even 256 concurrent users (that according to the TPC-C benchmark bring worst results), we’ll have 10 databases with 26 users on each, and each database can reach 64 users (up to 640 concurrent users). [sent-72, score-1.682]


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