Merge remote-tracking branch 'origin/release-8.5' into openai-api-base

* origin/release-8.5: (48 commits)
  Terraform: remove `cluster_id` in `cluster_id, vpc_peering_id` (#22318)
  Update the Compatibility changes of release-8.5.4 (#22233) (#22316)
  cloud: optimize the description of TiDB-X features (#22294)
  Add FORMAT keyword to import statement options (#22301) (#22304)
  cloud: delete disaster recovery (#22299)
  v8.5.4 tikv: update default settings of `server.grpc-concurrency` and `server.grpc-raft-conn-num`. (#22273) (#22298)
  Update create-tidb-instance-premium.md (#22288)
  sync-diff-inspector: add PROCESS permission when upstream and downstream are TiDB (#22289) (#22292)
  sql-faq: fix outdated description about JDBC (#22283) (#22287)
  master, v8.5: update download URL from pingcap.org to pingcap.com (#22240) (#22280)
  tikv: fix the default value of `end-point-memory-quota` (#22271) (#22272)
  v8.5.4: tikv: update auto compaction config (#22251) (#22265)
  pdf: update year to 2026 in copyright.tex (#22253) (#22260)
  v8.5.4 tikv: update rocksdb.max-manifest-file-size default value (#21689) (#22250)
  tidb-cloud: update the RU definition (#22197)
  cloud: update backup policies and execution rules (#22227)
  cloud: add release notes for 20251230 (#22247)
  cloud: add private link connection docs for overview and Confluent (#22246)
  tiproxy: add tiproxy usage in the tidb cloud doc (#21483)
  cloud: update the retention note for the latest automatic backup (#22248)
  ...

Author: breezewish

TOC-tidb-cloud-essential.md

@@ -6,9 +6,10 @@
 ## GET STARTED
 
 - Why TiDB Cloud
-  - [TiDB Cloud Introduction](/tidb-cloud/tidb-cloud-intro.md)
+  - [Introduction](/tidb-cloud/tidb-cloud-intro.md)
+  - [Features](/tidb-cloud/features.md)
   - [MySQL Compatibility](/mysql-compatibility.md)
-- Get Started with TiDB Cloud
+- Get Started
   - [Try Out TiDB Cloud](/tidb-cloud/tidb-cloud-quickstart.md)
   - [Try Out TiDB + AI](/vector-search/vector-search-get-started-using-python.md)
   - [Try Out HTAP](/tidb-cloud/tidb-cloud-htap-quickstart.md)
@@ -272,6 +273,9 @@
     - [Connect via Private Endpoint with Alibaba Cloud](/tidb-cloud/set-up-private-endpoint-connections-on-alibaba-cloud.md)
     - [Configure Firewall Rules for Public Endpoints](/tidb-cloud/configure-serverless-firewall-rules-for-public-endpoints.md)
     - [TLS Connections to TiDB Cloud](/tidb-cloud/secure-connections-to-serverless-clusters.md)
+  - Private Link Connection
+    - [Private Link Connection Overview](/tidb-cloud/serverless-private-link-connection.md)
+    - [Connect to Confluent Cloud on AWS](/tidb-cloud/serverless-private-link-connection-to-aws-confluent.md)
   - Audit Management
     - [Console Audit Logging](/tidb-cloud/tidb-cloud-console-auditing.md)
     - [Database Audit Logging](/tidb-cloud/essential-database-audit-logging.md)
@@ -486,6 +490,7 @@
     - [List of Expressions for Pushdown](/functions-and-operators/expressions-pushed-down.md)
     - [TiDB Specific Functions](/functions-and-operators/tidb-functions.md)
   - [Clustered Indexes](/clustered-indexes.md)
+  - [Global Indexes](/global-indexes.md)
   - [Constraints](/constraints.md)
   - [Generated Columns](/generated-columns.md)
   - [SQL Mode](/sql-mode.md)

TOC-tidb-cloud-premium.md

@@ -459,6 +459,7 @@
     - [List of Expressions for Pushdown](/functions-and-operators/expressions-pushed-down.md)
     - [TiDB Specific Functions](/functions-and-operators/tidb-functions.md)
   - [Clustered Indexes](/clustered-indexes.md)
+  - [Global Indexes](/global-indexes.md)
   - [Constraints](/constraints.md)
   - [Generated Columns](/generated-columns.md)
   - [SQL Mode](/sql-mode.md)

TOC-tidb-cloud-starter.md

@@ -6,11 +6,13 @@
 ## GET STARTED
 
 - Why TiDB Cloud
-  - [TiDB Cloud Introduction](/tidb-cloud/tidb-cloud-intro.md)
+  - [Introduction](/tidb-cloud/tidb-cloud-intro.md)
+  - [Features](/tidb-cloud/features.md)
   - [MySQL Compatibility](/mysql-compatibility.md)
-- Get Started with TiDB Cloud
+- Get Started
   - [Try Out TiDB Cloud](/tidb-cloud/tidb-cloud-quickstart.md)
-  - [Try Out TiDB + AI](/vector-search/vector-search-get-started-using-python.md)
+  - [Try Out TiDB + AI Tools](/tidb-cloud/use-tidb-cloud-with-ai-tools.md)
+  - [Try Out TiDB + Vector Search](/vector-search/vector-search-get-started-using-python.md)
   - [Try Out HTAP](/tidb-cloud/tidb-cloud-htap-quickstart.md)
   - [Try Out TiDB Cloud CLI](/tidb-cloud/get-started-with-cli.md)
 - Key Concepts
@@ -519,6 +521,7 @@
     - [List of Expressions for Pushdown](/functions-and-operators/expressions-pushed-down.md)
     - [TiDB Specific Functions](/functions-and-operators/tidb-functions.md)
   - [Clustered Indexes](/clustered-indexes.md)
+  - [Global Indexes](/global-indexes.md)
   - [Constraints](/constraints.md)
   - [Generated Columns](/generated-columns.md)
   - [SQL Mode](/sql-mode.md)

TOC-tidb-cloud.md

@@ -6,9 +6,10 @@
 ## GET STARTED
 
 - Why TiDB Cloud
-  - [TiDB Cloud Introduction](/tidb-cloud/tidb-cloud-intro.md)
+  - [Introduction](/tidb-cloud/tidb-cloud-intro.md)
+  - [Features](/tidb-cloud/features.md)
   - [MySQL Compatibility](/mysql-compatibility.md)
-- Get Started with TiDB Cloud
+- Get Started
   - [Try Out TiDB Cloud](/tidb-cloud/tidb-cloud-quickstart.md)
   - [Try Out TiDB + AI](/vector-search/vector-search-get-started-using-python.md)
   - [Try Out HTAP](/tidb-cloud/tidb-cloud-htap-quickstart.md)
@@ -230,6 +231,9 @@
     - TiDB Node Group
       - [Overview of TiDB Node Group](/tidb-cloud/tidb-node-group-overview.md)
       - [Manage TiDB Node Groups](/tidb-cloud/tidb-node-group-management.md)
+  - Manage Connections by TiProxy
+    - [Overview of TiProxy](/tidb-cloud/tiproxy-overview-for-cloud.md)
+    - [Manage TiProxy](/tidb-cloud/tiproxy-management.md)
   - [Upgrade a TiDB Cluster](/tidb-cloud/upgrade-tidb-cluster.md)
   - [Delete a TiDB Cluster](/tidb-cloud/delete-tidb-cluster.md)
 - Migrate or Import Data
@@ -311,11 +315,6 @@
     - [Set Up Self-Hosted Kafka Private Link Service in Azure](/tidb-cloud/setup-azure-self-hosted-kafka-private-link-service.md)
     - [Set Up Self-Hosted Kafka Private Service Connect in Google Cloud](/tidb-cloud/setup-self-hosted-kafka-private-service-connect.md)
     - [Set Up Private Endpoint for Changefeeds](/tidb-cloud/set-up-sink-private-endpoint.md)
-- Disaster Recovery
-  - [Recovery Group Overview](/tidb-cloud/recovery-group-overview.md)
-  - [Get Started](/tidb-cloud/recovery-group-get-started.md)
-  - [Failover and Reprotect Databases](/tidb-cloud/recovery-group-failover.md)
-  - [Delete a Recovery Group](/tidb-cloud/recovery-group-delete.md)
 - Security
   - [Security Overview](/tidb-cloud/security-overview.md)
   - Identity Access Control
@@ -592,6 +591,7 @@
     - [Set Operations](/functions-and-operators/set-operators.md)
     - [List of Expressions for Pushdown](/functions-and-operators/expressions-pushed-down.md)
   - [Clustered Indexes](/clustered-indexes.md)
+  - [Global Indexes](/global-indexes.md)
   - [Constraints](/constraints.md)
   - [Generated Columns](/generated-columns.md)
   - [SQL Mode](/sql-mode.md)

TOC.md

@@ -979,6 +979,7 @@
       - [List of Expressions for Pushdown](/functions-and-operators/expressions-pushed-down.md)      
       - [Comparisons between Functions and Syntax of Oracle and TiDB](/oracle-functions-to-tidb.md)
     - [Clustered Indexes](/clustered-indexes.md)
+    - [Global Indexes](/global-indexes.md)
     - [Vector Index](/vector-search/vector-search-index.md)
     - [Constraints](/constraints.md)
     - [Generated Columns](/generated-columns.md)

basic-features.md

@@ -65,8 +65,8 @@ You can try out TiDB features on [TiDB Playground](https://play.tidbcloud.com/?u
 | [Multi-valued indexes](/sql-statements/sql-statement-create-index.md#multi-valued-indexes) | Y | Y | Y | Y | N | N | N |
 | [Foreign key](/foreign-key.md) | Y | E | E | E | N | N | N |
 | [TiFlash late materialization](/tiflash/tiflash-late-materialization.md) | Y | Y | Y | Y | N | N | N |
-| [Global index](/partitioned-table.md#global-indexes) | Y |  N | N  | N | N | N | N |
-| [Vector index](/vector-search/vector-search-index.md) | E | N | N | N | N | N | N |
+| [Global indexes](/global-indexes.md) | Y |  N | N  | N | N | N | N |
+| [Vector indexes](/vector-search/vector-search-index.md) | E | N | N | N | N | N | N |
 
 ## SQL statements
 
@@ -173,7 +173,7 @@ You can try out TiDB features on [TiDB Playground](https://play.tidbcloud.com/?u
 | [Range INTERVAL partitioning](/partitioned-table.md#range-interval-partitioning) | Y | Y | Y | Y | E | N | N |
 | [Convert a partitioned table to a non-partitioned table](/partitioned-table.md#convert-a-partitioned-table-to-a-non-partitioned-table) | Y | Y | Y | N | N | N | N |
 | [Partition an existing table](/partitioned-table.md#partition-an-existing-table) | Y | Y | Y | N | N | N | N |
-| [Global index](/partitioned-table.md#global-indexes) | Y | N | N | N | N | N | N |
+| [Global indexes](/global-indexes.md) | Y | N | N | N | N | N | N |
 
 ## Statistics
 

best-practices/massive-regions-best-practices.md

@@ -149,7 +149,7 @@ The default size of a Region is 256 MiB, and you can reduce the number of Region
 
 ### Method 7: Increase the maximum number of connections for Raft communication
 
-By default, the maximum number of connections used for Raft communication between TiKV nodes is 1. Increasing this number can help alleviate blockage issues caused by heavy communication workloads of a large number of Regions. For detailed instructions, see [`grpc-raft-conn-num`](/tikv-configuration-file.md#grpc-raft-conn-num).
+To adjust the maximum number of connections used for Raft communication between TiKV nodes, you can modify the [`server.grpc-raft-conn-num`](/tikv-configuration-file.md#grpc-raft-conn-num) configuration item. Increasing this number can help alleviate blockage issues caused by heavy communication workloads of a large number of Regions.
 
 > **Note:**
 >

best-practices/three-nodes-hybrid-deployment.md

@@ -61,7 +61,7 @@ The default value of this parameter is 80% of the number of machine threads. In
 
 #### `server.grpc-concurrency`
 
-This parameter defaults to `4`. Because in the existing deployment plan, the CPU resources are limited and the actual requests are few. You can observe the monitoring panel, lower the value of this parameter, and keep the usage rate below 80%.
+Because in the existing deployment plan, the CPU resources are limited and the actual requests are few. You can observe the monitoring panel, lower the value of [`server.grpc-concurrency`](/tikv-configuration-file.md#grpc-concurrency), and keep the usage rate below 80%.
 
 In this test, the value of this parameter is set to `2`. Observe the **gRPC poll CPU** panel and you can see that the usage rate is just around 80%.
 

best-practices/tidb-best-practices.md

@@ -80,7 +80,7 @@ Similarly, if all data is read from a focused small range (for example, the cont
 
 ### Secondary index
 
-TiDB supports the complete secondary indexes, which are also global indexes. Many queries can be optimized by index. Thus, it is important for applications to make good use of secondary indexes.
+TiDB supports the complete secondary indexes, which are also [global indexes](/global-indexes.md). Many queries can be optimized by index. Thus, it is important for applications to make good use of secondary indexes.
 
 Lots of MySQL experience is also applicable to TiDB. It is noted that TiDB has its unique features. The following are a few notes when using secondary indexes in TiDB.
 

choose-index.md

@@ -81,7 +81,7 @@ Skyline-pruning is a heuristic filtering rule for indexes, which can reduce the
 
 - Select whether the index satisfies a certain order. Because index reading can guarantee the order of certain column sets, indexes that satisfy the query order are superior to indexes that do not satisfy on this dimension.
 
-- Whether the index is a [global index](/partitioned-table.md#global-indexes). In partitioned tables, global indexes can effectively reduce the number of cop tasks for a SQL compared to normal indexes, thus improving overall performance.
+- Whether the index is a [global index](/global-indexes.md). In partitioned tables, global indexes can effectively reduce the number of cop tasks for a SQL compared to normal indexes, thus improving overall performance.
 
 For these preceding dimensions, if the index `idx_a` performs no worse than the index `idx_b` in all three dimensions and performs better than `idx_b` in one dimension, then `idx_a` is preferred. When executing the `EXPLAIN FORMAT = 'verbose' ...` statement, if skyline-pruning excludes some indexes, TiDB outputs a NOTE-level warning listing the remaining indexes after the skyline-pruning exclusion.