Retention arithmetic for a 2 TB per day feed at three compression ratios (illustrative inputs)
Answered against 22 years of US equities and 12 years of US options data and published with the query that produced it. This result is stored as of 2026-09-17, from How to Store Market Data PCAPs: Split, Compress.
| scenario | gb_per_day | tb_per_year | tb_two_years |
|---|---|---|---|
| ratio 3 | 667 | 166.7 | 333.3 |
| ratio 5 | 400 | 100 | 200 |
| ratio 8 | 250 | 62.5 | 125 |
- Rows × columns
- 3 × 4
- Computed
- Completeness
- No missing values
- Source
- US exchange, SIP and OPRA market data
- Licence
- Strasmore terms · free, no signup
What each column holds
| Column | Type | Range | Notes |
|---|---|---|---|
scenario |
text | 3 distinct values (ratio 3, ratio 5, ratio 8) | |
gb_per_day |
number | 250 to 667 | |
tb_per_year |
number | 62.5 to 166.7 | |
tb_two_years |
number | 125 to 333.3 |
Computed from Strasmore's warehouse of US exchange, SIP and OPRA market data. Equity prices are delayed; options greeks and implied volatility are end-of-day. This result is stored, not recomputed on load — it is exactly the numbers that were returned on , and the query below is what returned them.
Run it yourself
This is the exact query behind the result above. Change a ticker, a date or a column and run it against the warehouse — no account, no key. The no-signup tier is smaller than the one this page was computed on; a query that reaches past it comes back saying which plan runs it.
SELECT
concat('ratio ', toString(ratio)) AS scenario,
round(raw_tb_per_day * 1000 / ratio) AS gb_per_day,
round(raw_tb_per_day * sessions / ratio, 1) AS tb_per_year,
round(raw_tb_per_day * sessions * 2 / ratio, 1) AS tb_two_years
FROM
(
SELECT
2 AS raw_tb_per_day,
250 AS sessions,
arrayJoin([3, 5, 8]) AS ratio
)
ORDER BY ratio
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