[WIP] add release notes v9.0.0 #20035

hfxsd · 2025-03-12T02:35:41Z

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releases/release-9.0.0.md

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…0035

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releases/release-9.0.0.md

…hash, and redact-info-log

releases/release-9.0.0.md

Co-authored-by: Grace Cai <qqzczy@126.com>

releases/release-9.0.0.md

Oreoxmt · 2025-04-16T10:28:24Z

releases/release-9.0.0.md

+    * `MAX`
+    * `MIN`
+    * `COUNT`
+    * `SUM`
+    * `AVG`


Suggested change

* `MAX`

* `MIN`

* `COUNT`

* `SUM`

* `AVG`

* `MAX()`

* `MIN()`

* `COUNT()`

* `SUM()`

* `AVG()`

Oreoxmt · 2025-04-16T10:34:49Z

releases/release-9.0.0.md

+        -  如果升级前未指定过 [`format_version`](/tiflash/tiflash-configuration.md#format_version)，升级后 TiFlash 默认采用新的存储格式。
+        -  如果升级前指定过 [`format_version`](/tiflash/tiflash-configuration.md#format_version)，升级后 `format_version` 的值保持不变， TiFlash 会继续使用 `format_version` 指定的存储格式。此时如需启用新的存储格式，请在 TiFlash 配置文件中将 `format_version` 设置为 `8`。配置生效后，新写入 TiFlash 的数据将采用新的存储格式，而现有数据的存储格式则不受影响。


Suggested change

- 如果升级前未指定过 [`format_version`](/tiflash/tiflash-configuration.md#format_version)，升级后 TiFlash 默认采用新的存储格式。

- 如果升级前指定过 [`format_version`](/tiflash/tiflash-configuration.md#format_version)，升级后 `format_version` 的值保持不变， TiFlash 会继续使用 `format_version` 指定的存储格式。此时如需启用新的存储格式，请在 TiFlash 配置文件中将 `format_version` 设置为 `8`。配置生效后，新写入 TiFlash 的数据将采用新的存储格式，而现有数据的存储格式则不受影响。

- 如果升级前未指定过 [`format_version`](/tiflash/tiflash-configuration.md#format_version)，升级后 TiFlash 默认采用新的存储格式。

- 如果升级前指定过 [`format_version`](/tiflash/tiflash-configuration.md#format_version)，升级后 `format_version` 的值保持不变，TiFlash 会继续使用 `format_version` 指定的存储格式。此时如需启用新的存储格式，请在 TiFlash 配置文件中将 `format_version` 设置为 `8`。配置生效后，新写入 TiFlash 的数据将采用新的存储格式，而现有数据的存储格式则不受影响。

Oreoxmt · 2025-04-16T10:36:46Z

releases/release-9.0.0.md

+
+* TiFlash 支持新的存储格式以提升字符串类型扫描效率 [#9673](https://github.com/pingcap/tiflash/issues/9673) @[JinheLin](https://github.com/JinheLin) **tw@qiancai**<!--2066-->
+
+    在 v9.0.0 版本之前，TiFlash 存储字符串类型数据的格式在扫描时需要逐行读取，因此对于长度较小的字符串数据，扫描效率不高。在 v9.0.0 中，TiFlash 引入了新的存储格式，针对字符串格式数据的存储进行了优化，提升了长度小于 64 字节的字符串数据扫描效率，且不会影响其他数据的存储和扫描性能。


Suggested change

在 v9.0.0 版本之前，TiFlash 存储字符串类型数据的格式在扫描时需要逐行读取，因此对于长度较小的字符串数据，扫描效率不高。在 v9.0.0 中，TiFlash 引入了新的存储格式，针对字符串格式数据的存储进行了优化，提升了长度小于 64 字节的字符串数据扫描效率，且不会影响其他数据的存储和扫描性能。

在 v9.0.0 版本之前，TiFlash 存储字符串类型数据的格式在扫描时需要逐行读取，导致短字符串的扫描效率较低。在 v9.0.0 中，TiFlash 引入了新的存储格式，针对字符串格式数据的存储进行了优化，提升了长度小于 64 字节的字符串数据的扫描效率，且不会影响其他数据的存储和扫描性能。

Oreoxmt · 2025-04-16T10:37:33Z

releases/release-9.0.0.md

+
+* 支持对分区表的非唯一列创建全局索引 [#58650](https://github.com/pingcap/tidb/issues/58650) @[Defined2014](https://github.com/Defined2014) @[mjonss](https://github.com/mjonss) **tw@qiancai**<!--2057-->
+
+    从 v8.3.0 开始，TiDB 支持用户在分区表的唯一列上创建全局索引以提高查询性能，但不支持在非唯一列上创建全局索引。从 v9.0 版本起，TiDB 取消了这一限制，允许用户在分区表的非唯一列上创建全局索引，提升了全局索引的易用性。


Suggested change

从 v8.3.0 开始，TiDB 支持用户在分区表的唯一列上创建全局索引以提高查询性能，但不支持在非唯一列上创建全局索引。从 v9.0 版本起，TiDB 取消了这一限制，允许用户在分区表的非唯一列上创建全局索引，提升了全局索引的易用性。

从 v8.3.0 开始，TiDB 支持用户在分区表的唯一列上创建全局索引以提高查询性能，但不支持在非唯一列上创建全局索引。从 v9.0.0 起，TiDB 取消了这一限制，允许用户在分区表的非唯一列上创建全局索引，提升了全局索引的易用性。

releases/release-9.0.0.md

Create release-9.0.0.md

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hfxsd self-assigned this Mar 12, 2025

ti-chi-bot bot added the contribution This PR is from a community contributor. label Mar 12, 2025

hfxsd mentioned this pull request Mar 12, 2025

[WIP] add release notes v9.0.0 pingcap/docs#20510

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[WIP] add release notes v9.0.0 #20035

[WIP] add release notes v9.0.0 #20035

hfxsd commented Mar 12, 2025

Oreoxmt commented Mar 21, 2025

ti-chi-bot bot commented Apr 8, 2025

ti-chi-bot bot commented Apr 9, 2025

ti-chi-bot bot commented Apr 14, 2025

Oreoxmt Apr 16, 2025

Oreoxmt Apr 16, 2025 •

edited

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Oreoxmt Apr 16, 2025

Oreoxmt Apr 16, 2025

-    * `MAX`
-    * `MIN`
-    * `COUNT`
-    * `SUM`
-    * `AVG`
+    * `MAX()`
+    * `MIN()`
+    * `COUNT()`
+    * `SUM()`
+    * `AVG()`

		- 如果升级前未指定过 [`format_version`](/tiflash/tiflash-configuration.md#format_version)，升级后 TiFlash 默认采用新的存储格式。
		- 如果升级前指定过 [`format_version`](/tiflash/tiflash-configuration.md#format_version)，升级后 `format_version` 的值保持不变， TiFlash 会继续使用 `format_version` 指定的存储格式。此时如需启用新的存储格式，请在 TiFlash 配置文件中将 `format_version` 设置为 `8`。配置生效后，新写入 TiFlash 的数据将采用新的存储格式，而现有数据的存储格式则不受影响。


		* TiFlash 支持新的存储格式以提升字符串类型扫描效率 [#9673](https://github.com/pingcap/tiflash/issues/9673) @[JinheLin](https://github.com/JinheLin) tw@qiancai<!--2066-->

		在 v9.0.0 版本之前，TiFlash 存储字符串类型数据的格式在扫描时需要逐行读取，因此对于长度较小的字符串数据，扫描效率不高。在 v9.0.0 中，TiFlash 引入了新的存储格式，针对字符串格式数据的存储进行了优化，提升了长度小于 64 字节的字符串数据扫描效率，且不会影响其他数据的存储和扫描性能。


		* 支持对分区表的非唯一列创建全局索引 [#58650](https://github.com/pingcap/tidb/issues/58650) @[Defined2014](https://github.com/Defined2014) @[mjonss](https://github.com/mjonss) tw@qiancai<!--2057-->

		从 v8.3.0 开始，TiDB 支持用户在分区表的唯一列上创建全局索引以提高查询性能，但不支持在非唯一列上创建全局索引。从 v9.0 版本起，TiDB 取消了这一限制，允许用户在分区表的非唯一列上创建全局索引，提升了全局索引的易用性。

[WIP] add release notes v9.0.0 #20035

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[WIP] add release notes v9.0.0 #20035

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hfxsd commented Mar 12, 2025

First-time contributors' checklist

What is changed, added or deleted? (Required)

Which TiDB version(s) do your changes apply to? (Required)

What is the related PR or file link(s)?

Do your changes match any of the following descriptions?

Oreoxmt commented Mar 21, 2025

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