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Clarify TiKV large-row limit in transaction restraints (#23338) #23348

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ti-chi-bot merged 4 commits into from
Jul 23, 2026
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Clarify TiKV large-row limit in transaction restraints (#23338) #23348

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docs: clarify TiKV limit for large rows
doc-claw-bot Jul 22, 2026
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Update develop/dev-guide-transaction-restraints.md
qiancai Jul 23, 2026
90d6b86
Update develop/dev-guide-transaction-restraints.md
qiancai Jul 23, 2026
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Update develop/dev-guide-transaction-restraints.md
qiancai Jul 23, 2026
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1 change: 1 addition & 0 deletions develop/dev-guide-transaction-restraints.md
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Expand Up @@ -714,6 +714,7 @@ The basic principle is to limit the size of the transaction. At the KV level, Ti

- You can adjust it by using the [`performance.txn-entry-size-limit`](https://docs.pingcap.com/tidb/stable/tidb-configuration-file#txn-entry-size-limit-new-in-v4010-and-v500) configuration parameter of tidb-server for TiDB v4.0.10 and later v4.0.x versions, TiDB v5.0.0 and later versions. The value is `6 MB` for versions earlier than v4.0.10.
- Starting from v7.6.0, you can use the [`tidb_txn_entry_size_limit`](/system-variables.md#tidb_txn_entry_size_limit-new-in-v760) system variable to dynamically modify the value of this configuration item.
- Note that TiKV also limits the data size of a single write request. If the data size of a single write request exceeds [`raftstore.raft-entry-max-size`](/tikv-configuration-file.md#raft-entry-max-size), which is `8 MiB` by default, TiKV rejects the request. When a single row is large, you need to adjust both `tidb_txn_entry_size_limit` for TiDB and `raftstore.raft-entry-max-size` for TiKV.

- The maximum single transaction size supported is 1 TiB.

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