yugabyte-db
https://github.com/yugabyte/yugabyte-db
C++
YugaByteDB is a high-performance, transactional database for building distributed cloud services. It currently supports Redis API (as a true DB), Cassandra API and SQL is coming very soon.
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- Issues
- [YSQL] Wrong results on executing 'plpgsql' proc that encapsulates 'drop index', 'populate table', and 'create unique index'
- [DocDB] Transaction status tablets seem to always get placed in the cluster's default placement info even when transaction takes place entirely in a tablespace
- [DocDB] Mark all tables in system namespace with TableInfo::is_system_
- [YSQL] Sequential scans with a filter on an actual tables are 2X faster than index/indexonly scan on an index table with a filter.
- [YSQL] Orderby operation with a sequential scan with filter condition(expression pushdown) is 2x faster than a sequential scan without filter.
- [YSQL] Count aggregate on an indexed column is performed using a sequential scan on actual table instead of indexonly scan on an index table.
- Consider improvements from Speedb
- [DocDB] size of jsonb column for same dataset, differs in PG and YB
- [YSQL] Distinct performance on a column part of composite PK is 130x in YB colocated slower than PG
- [YSQL] PgRangePartitionedTableSplitTest fails when TSAN is enabled
- Docs
- C++ not yet supported