> ## Documentation Index
> Fetch the complete documentation index at: https://docs.breakscale.tech/llms.txt
> Use this file to discover all available pages before exploring further.

# Load balanced

> More servers, same database behind them

Three servers share the load, but they all still talk to the same database.

## What to watch

Three servers share one database. That triples the API capacity and does nothing for the database, which still tops out near 480 a second. Adding servers only helps when the servers were the problem.

## What it is made of

| Component     | Count |
| ------------- | ----: |
| Client        |     1 |
| Database      |     1 |
| Load balancer |     1 |
| Service       |     3 |

## Under load

Measured by running this design through the simulator at multiples of its own offered rate of 140 requests a second. Twenty seconds of simulated time, one fixed seed, so the same numbers come out every time.

<Note>This design holds 420 requests a second with 0% errors. At 560 it is losing 25% of them.</Note>

| Offered | Goodput |     p99 | Errors |
| ------: | ------: | ------: | -----: |
|     140 |     154 | 144.3ms |     0% |
|     210 |     209 |   122ms |     0% |
|     280 |     261 | 123.2ms |     0% |
|     350 |     347 | 140.3ms |     0% |
|     420 |     402 | 361.7ms |     0% |
|     560 |     427 | 373.3ms |  25.3% |
|     840 |     434 | 543.9ms |  49.5% |
|    1120 |     422 | 556.4ms |  62.6% |

<Card title="Open this example" icon="play" href="https://breakscale.tech">
  Load **Load balanced** from the Examples menu and drag the traffic slider yourself.
</Card>