# TDengine ver-3.4.0.0 — 3.4.0.0

- Product: TDengine (https://whatsnew.fyi/product/tdengine)
- Vendor: taosdata
- Date: 2026-01-08
- Version: ver-3.4.0.0
- Original notes: https://github.com/taosdata/TDengine/releases/tag/ver-3.4.0.0
- Permalink: https://whatsnew.fyi/product/tdengine/releases/ver-3.4.0.0

What's New is an index, not a publisher: every entry below links to the vendor's own release notes, which are the authoritative source. Entries are labelled where they are hand-curated sample data, pre-releases, or drawn from a secondary source such as a developer blog.

Reuse: the summaries, labels and curation here are © What's New. Quote freely with attribution and a link back; wholesale republication of the corpus is not permitted — terms: https://whatsnew.fyi/terms. The vendors' own release notes remain their publishers'.

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- **added** — Add connector info attribute in ws connection for adapter
- **added** — C websocket support ssl/tls connection params
- **added** — Support taosAdapter instances register and query
- **added** — Parse and write any JSON data to database
- **added** — Add rust connector benchmark tool
- **added** — Support taosX high-availability and Kafka task load balancing
- **added** — TDgpt supports row correlation analysis functions such as dtw, dtw_path and tlcc
- **added** — Data transmission supports SASL mechanism and resource control
- **added** — Data storage supports full transparent encryption
- **added** — Support multi-factor authentication (MFA) and multiple login security policies
- **added** — Support RBAC-based permission architecture
- **added** — Support hierarchical auditing and permission control
- **added** — Support SM4_ENCRYPT, SM4_DECRYPT, AES_ENCRYPT, AES_DECRYPT, MD5, SHA, SHA1, SHA2, MASK_FULL, MASK_PARTIAL, MASK_NONE, FROM_BASE64 and TO_BASE64 functions
- **added** — Event window triggering of stream supports sub-event windows
- **added** — Explorer add support for OAuth 2.0 and OIDC SSO
- **added** — TaosAdapter support customized SQL rejection rules
- **added** — Add identity authentication functions
- **changed** — Increase the maximum number of columns supported by virtual tables to 32767
- **changed** — Stream now supports interp and percentile functions

##### Behavior change and compatibility

##### Features

  1. feat: adapter add connector info attribute in ws connection
  2. feat: C websocket support ssl/tls connection params
  3. feat: support taosAdapter instances register and query
  4. feat: parse and write any JSON data to database
  5. feat: add rust connector benchmark tool
  6. feat: support taosX high-availability and Kafka task load balancing
  7. feat: TDgpt supports row correlation analysis functions such as dtw, dtw_path and tlcc
  8. feat: data transmission supports SASL mechanism and resource control [Enterprise Edition]
  9. feat: data storage supports full transparent encryption [Enterprise Edition]
 10. feat: support multi-factor authentication (MFA) and multiple login security policies [Enterprise Edition]
 11. feat: support RBAC-based permission architecture [Enterprise Edition]
 12. feat: support hierarchical auditing and permission control [Enterprise Edition]
 13. feat: Support SM4_ENCRYPT, SM4_DECRYPT, AES_ENCRYPT, AES_DECRYPT, MD5, SHA, SHA1, SHA2, MASK_FULL, MASK_PARTIAL, MASK_NONE, FROM_BASE64 and TO_BASE64 functions
 14. feat: event window triggering of stream supports sub-event windows
 15. feat: Explorer add support for OAuth 2.0 and OIDC SSO
 16. feat: taosAdapter support customized SQL rejection rules
 17. feat: add identity authentication functions

##### Enhancements

  1. enh: increase the maximum number of columns supported by virtual tables to 32767
  2. enh: prohibit sorting by aggregate functions in non-aggregate queries
  3. enh: state windows now support specifying a "zero state" via zeroth_state, skipping computation and output for windows in this state.
  4. enh: optimize the error message when taosc initialization fails due to insufficient write permissions for the log file directory
  5. enh: stream now supports interp and percentile functions
  6. enh: reduce resource consumption of trigger data and computation data reading in stream computing
  7. enh: prohibit the use of duplicate timestamps in state_window, count_window and event_window on super tables
  8. enh: improved the exit handling logic of taosmqtt to achieve a more graceful shutdown and resource release
  9. enh: set the global timezone to reduce lock contention related to time conversion during concurrent queries and writes
 10. enh: window query do not require mandatory aggregate functions, support including only pseudo-columns like _wstart and tbname
 11. enh: Linux tar package supports non-root installation of TDengine TSDB with custom install path
 12. enh: after modifying tag columns, support data subscription to take effect without reconstruction by executing the RELOAD TOPIC command
 13. enh: support recording operations such as query and deletion in audit logs
 14. enh: add the client version number field to the show connections command.
 15. enh: add status and note fields to the ins_anodes_full table for real-time feedback on model and algorithm status
 16. enh: add two Hints parameters (WIN_OPTIMIZE_BATCH and WIN_OPTIMIZE_SINGLE) to improve the state window query performance of virtual tables
 17. enh: support encryption algorithm management [Enterprise Edition]
 18. enh: add clock check mechanism for communication between clusters
 19. enh: add support for virtual table queries in stmt2
 20. enh: compact command now support the force option
 21. enh: improve the query performance of aggregate and selection functions for virtual super tables
 22. enh: support for user login failure policies
 23. enh: optimize OPC-DA collection and auto-reconnection
 24. enh: execution plan supports displaying tag indexes
 25. enh: add the 'is_ready' column to the show vgroups command
 26. enh: add bool type validation during stmt2 writing
 27. enh: adjust the logs of stmt2 to facilitate problem troubleshooting
 28. enh: event window of stream generates window opening notifications only when the true_for condition is met

_[Truncated at 4000 characters — full notes: https://github.com/taosdata/TDengine/releases/tag/ver-3.4.0.0]_