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Clarify TiKV large-row limit in transaction restraints (#23338) (#23348) #23351

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ti-chi-bot merged 3 commits into from
Jul 25, 2026
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Clarify TiKV large-row limit in transaction restraints (#23338) (#23348) #23351

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This is an automated cherry-pick of #23348
ti-chi-bot Jul 23, 2026
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Update develop/dev-guide-transaction-restraints.md
qiancai Jul 25, 2026
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Update develop/dev-guide-transaction-restraints.md
qiancai Jul 25, 2026
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2 changes: 1 addition & 1 deletion develop/dev-guide-transaction-restraints.md
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Expand Up @@ -714,7 +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` in TiDB and `raftstore.raft-entry-max-size` in TiKV.
- 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.

@coderabbitai coderabbitai Bot Jul 25, 2026

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🎯 Functional Correctness | 🟠 Major | ⚡ Quick win

Preserve the pre-v7.6 TiDB setting.

This repeats the previously reported version-compatibility issue: tidb_txn_entry_size_limit is available starting in v7.6.0, but this change also targets v7.5.

Suggested change
- 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.
- 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 the TiDB row-size limit (`performance.txn-entry-size-limit`, or `tidb_txn_entry_size_limit` starting from v7.6.0) and `raftstore.raft-entry-max-size` in TiKV.

As per path instructions, this Markdown fix uses a committable suggestion.

Source: Path instructions


- The maximum single transaction size supported is 1 TiB.

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