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A comment on Umbra: A Disk-Based System with In-Memory Performance [pdf]. Parent comment
Umbra, on the other hand, is a full fledged, ACID compliant relational database systems with all bells and whistles.
However, Umbra can process multiple 100ks of transactions per second. If you're interested in more details, take a look at Figure 6 in this research paper: https://db.in.tum.de/~freitag/papers/p2797-freitag.pdf
Disclosure: I work for CedarDB (https://cedardb.com), the commercial spinoff of Umbra.
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Umbra, on the other hand, is a full fledged, ACID compliant relational database systems with all bells and whistles.
However, Umbra can process multiple 100ks of transactions per second. If you're interested in more details, take a look at Figure 6 in this research paper: https://db.in.tum.de/~freitag/papers/p2797-freitag.pdf
Disclosure: I work for CedarDB (https://cedardb.com), the commercial spinoff of Umbra.