# TDengine ver-3.4.0.2 — 3.4.0.2

- Product: TDengine (https://whatsnew.fyi/product/tdengine)
- Vendor: taosdata
- Date: 2026-02-02
- Version: ver-3.4.0.2
- Original notes: https://github.com/taosdata/TDengine/releases/tag/ver-3.4.0.2
- Permalink: https://whatsnew.fyi/product/tdengine/releases/ver-3.4.0.2

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** — Automatically create xnode during TSDB initialization
- **added** — Explorer License page show machine code
- **added** — taosX-agent support xnode ha
- **added** — taosX support parquet files import
- **added** — add SQL recording for STMT in adapter
- **added** — Rust native connector support STMT2
- **added** — support dual conditions of duration and row count for true_for judgment in event and state windows of stream and batch query
- **changed** — STMT query supports the binding of the interval parameter
- **changed** — provide clearer error messages for SQL statements
- **changed** — add column created_by/labels for XNODE TASK
- **changed** — optimize the login verification logic to force root users who log in with the default password to change their passwords
- **changed** — improve the processing mechanism of data encryption for bse and other files
- **changed** — add notification mechanism related to user tokens
- **changed** — support upgrading clusters with old-version data encryption mechanism to new-version one
- **changed** — support creating TOTP secrets using the create totp_secret syntax
- **changed** — Support both IPv4 & IPv6 protocol stacks
- **changed** — support updating expiration time and policy for data encryption keys
- **changed** — allow any chars in MQTT topic
- **changed** — rename lag function to fill_forward and redevelop Lag function compatible with MySQL in follow-up
- **fixed** — incorrect results when executing the show create table statement on virtual tables
- **fixed** — null pointer error when InfluxDB schema changes
- **fixed** — crash in stream caused by improper handling of heartbeat messages after mnode leader switchover
- **fixed** — memory leak that occurs when UDF function initialization fails
- **fixed** — influxdb error with backslash syntax in taosX
- **fixed** — incorrect results when invoking the concat function in stream
- **fixed** — taoskeeper allow special chars in password
- **fixed** — inaccurate scheduled execution time for multi-level storage migration tasks

##### Behavior change and compatibility

##### Features

  1. feat: Automatically create xnode during TSDB initialization
  2. feat: Explorer License page show machine code
  3. feat: taosX-agent support xnode ha
  4. feat: taosX support parquet files import
  5. feat: add SQL recording for STMT in adapter
  6. feat: Rust native connector support STMT2
  7. feat: support dual conditions of duration and row count for true_for judgment in event and state windows of stream and batch query

##### Enhancements

  1. enh: STMT query supports the binding of the interval parameter
  2. enh: provide clearer error messages for SQL statements
  3. enh: add column created_by/labels for XNODE TASK
  4. enh: optimize the login verification logic to force root users who log in with the default password to change their passwords
  5. enh: improve the processing mechanism of data encryption for bse and other files
  6. enh: add notification mechanism related to user tokens
  7. enh: support upgrading clusters with old-version data encryption mechanism to new-version one
  8. enh: support creating TOTP secrets using the create totp_secret syntax
  9. enh: Support both IPv4 & IPv6 protocol stacks
 10. enh: support updating expiration time and policy for data encryption keys
 11. enh: allow any chars in MQTT topic
 12. enh: rename lag function to fill_forward and redevelop Lag function compatible with MySQL in follow-up
 13. enh: improve performance of cols + last queries on virtual tables with only one original table
 14. enh: support modifying permission control for users
 15. enh: improve permission control for views and audits
 16. enh: handle permission compatibility from version 3.3 to 3.4
 17. enh: prohibit users from tampering with configuration files after data encryption takes effect
 18. enh: optimize the notification content of stream period triggers by adding the trigger start time and end time fields (retaining the windowStart and windowEnd field names)
 19. enh: adjust the upper limit of the original tables referenced by virtual tables from 1000 to 2000
 20. enh: reduce the computing latency when stream query statements contain virtual table tag filter conditions
 21. enh: optimize the syntax of stream statements to support the use of placeholders such as _twstart in the ORDER BY clause
 22. enh: optimize the execution logic of outer join queries to resolve the issue where limit does not take effect when order by is not specified

##### Fixes

  1. fix: incorrect results when executing the show create table statement on virtual tables
  2. fix: null pointer error when InfluxDB schema changes
  3. fix: crash in stream caused by improper handling of heartbeat messages after mnode leader switchover
  4. fix: memory leak that occurs when UDF function initialization fails
  5. fix: influxdb error with backslash syntax in taosX
  6. fix: incorrect results when invoking the concat function in stream
  7. fix: taoskeeper allow special chars in password
  8. fix: inaccurate scheduled execution time for multi-level storage migration tasks
  9. fix: migrate stuck in AVEVA Historian data-in
 10. fix: incorrect results when the data in individual group windows is all NULL values during multi-group processing in state windows
 11. fix: abnormal calculation results after deleting and rebuilding the result subtable of stream
 12. fix: the client may crash when the concurrent write volume of STMT is high
 13. fix: incorrect default time configuration issue for password reuse restrictions
 14. fix: error while performing JOIN operations with subqueries without the FROM clause
 15. fix: MySQL DataIn task may blocking when few data rows
 16. fix: remove duplicate error details
 17. fix: trigger logic error of the true_for option in stream when out-of-order data is written
 18. fix: taosX native connection tmq error message
 19. fix: possibly stuck on systemctl stop taosd caused by xnoded
 20. f

_[Truncated at 4000 characters — full notes: https://github.com/taosdata/TDengine/releases/tag/ver-3.4.0.2]_