product · May 20, 2026

QuestDB Releases 9.4.0 with New SYMBOL Column Index Ahead of Version 10.0

Co-founder Nicolas Hourcard announced QuestDB 9.4.0 release on LinkedIn. The update adds a new posting and covering index for SYMBOL columns that groups rows by key first then by timestamp. This change makes data for a given symbol contiguous on disk, reduces cold reads I/O, and improves performance under load. Files become approximately 13 times smaller than BITMAP indexes, lookups run 1.3 to 1.5 times faster, and INCLUDE clauses allow queries to skip data files entirely. QuestDB 9.4.0 is the final release before version 10.0.