>>I haven't heard anything about DB2 in a long time. Glad to hear it's still around. Are they many installations?
>
>#6 world-wide:
>https://db-engines.com/en/ranking
>
>Top 10:
>

* Ranking                           Score      Change since Nov 2017
>* -----------------------------    -------     ---------------------
>* 1. Oracle     Relational DBMS    1283.22          -17.89
>* 2. MySQL      Relational DBMS    1161.25           +1.36
>* 3. SQL Server Relational DBMS    1040.34          -11.21
>* 4. PostgreSQL Relational DBMS     460.64          +20.39
>* 5. MongoDB    Document store      378.62           +9.14
>* 6. IBM Db2    Relational DBMS     180.75           +0.87
>* 7. Redis      Key-value store     146.83           +2.66
>* 8. Elasticsearch Search engine    144.70           +1.24
>* 9. Access     Relational DBMS     139.51           +1.08
>* 10. SQLite    Relational DBMS     123.02           +0.31

>
>When I worked at Toyota I asked why they used DB2. They said when they were determining what databases to use they did a test. They had each database vendor installed on a server and had it using a real-world-like simulated workload of so-many-hundreds/thousands of transactions per second. They literally went around to the back of the servers and pulled the power cord. Of all the database engines they tested, the only one that didn't lose anything (that was confirmed as written back with confirmation to the client machine) was DB2. Every other vendor lost the last few records. They made the decision and used it ever since.


Interesting

If you had done a similar listing during mainframe days it might have been:

ADABAS, IDMS, IMS.


IDMS, in particular, was the hot one.