PCA PCA Storage & Retention

Question 1

What is the default local storage retention period for Prometheus time-series data?

Accepted Answer

15 days

Answer

30 days

Answer

7 days

Answer

90 days

Question 2

Which Prometheus storage format organizes data into time-based directories called blocks?

Accepted Answer

TSDB (Time Series Database)

Answer

LevelDB

Answer

RocksDB

Answer

InfluxDB line protocol

Question 3

Which flag sets the maximum amount of disk space Prometheus can use for local storage?

Accepted Answer

--storage.tsdb.retention.size

Answer

--storage.tsdb.max-disk

Answer

--storage.local.max-size

Answer

--tsdb.disk-limit

Question 4

What is the Write-Ahead Log (WAL) in Prometheus TSDB used for?

Accepted Answer

Durably recording incoming samples before they are compacted into blocks

Answer

Pre-computing recording rules before they run

Answer

Streaming metrics to remote storage in real time

Answer

Logging HTTP scrape requests for debugging

Question 5

How long does Prometheus keep data in memory before writing it to a disk block by default?

Accepted Answer

2 hours

Answer

15 minutes

Answer

24 hours

Answer

1 hour

Question 6

What does Prometheus do when its local disk retention limit is reached?

Accepted Answer

Deletes the oldest TSDB blocks first

Answer

Stops accepting new scrapes

Answer

Writes excess data to remote_write only

Answer

Compresses all blocks to save space