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## Overview
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what problem it solves or how it makes things better. -->
This PR provides two performance related improvements to couch_server:
1. Use `{read_concurrency, true}` for the protected `couch_dbs` ETS table
used in couch_server.
2. Don't send update_lru messages to couch_server when disabled
## Testing recommendations
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Does it provides any behaviour that the end users
could notice? -->
Standard test suite should do the trick.
## Related Issues or Pull Requests
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repositories please put links to those issues or pull requests here. -->
## Checklist
- [X] Code is written and works correctly;
- [X] Changes are covered by tests;
- [ ] Documentation reflects the changes;
[ Full content available at: https://github.com/apache/couchdb/pull/1593 ]
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