cloud: add migration docs for TiDB Cloud Essential

[xuanyu66]

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[gemini-code-assist]

Summary of Changes

Hello @xuanyu66, I'm Gemini Code Assist¹! I'm currently reviewing this pull request and will post my feedback shortly. In the meantime, here's a summary to help you and other reviewers quickly get up to speed!

This pull request introduces two new essential documentation pages for TiDB Cloud, guiding users through the process of migrating MySQL-compatible databases to TiDB Cloud Essential. The documentation covers detailed steps for both full data migration (existing and incremental) and incremental-only migration, including critical prerequisites like binary log configuration, network setup, and privilege management, aiming to simplify and streamline the migration experience for various cloud and self-managed MySQL environments.

Highlights

• New Migration Guide (Full & Incremental): A new document migrate-from-mysql-using-data-migration-essential.md has been added, providing a comprehensive guide for migrating MySQL-compatible databases (including Amazon Aurora MySQL, Amazon RDS, Azure Database for MySQL, Google Cloud SQL for MySQL, and self-managed MySQL) to TiDB Cloud Essential. This guide covers both existing data and continuous incremental replication.
• New Migration Guide (Incremental Only): A companion document migrate-incremental-data-from-mysql-using-data-migration-essential.md has been added, specifically detailing the process for migrating only incremental data from MySQL-compatible sources to TiDB Cloud Essential.
• Detailed Prerequisites: Both guides include extensive prerequisites, such as supported data sources and versions, binary log configuration for replication (log_bin, binlog_format, binlog_row_image, binlog_expire_logs_seconds), network connectivity setup (public endpoints, private links, TLS/SSL), and necessary user privileges for both source and target databases.
• Step-by-Step Migration Process: The documents outline a clear 7-step process for setting up and executing a data migration job, from navigating the TiDB Cloud console to configuring connections, choosing migration types, selecting objects, prechecks, spec selection, and monitoring progress.
• Specific Limitations and Troubleshooting: Each guide details specific limitations related to availability, maximum job count, filtered databases, and nuances of existing vs. incremental data migration, along with references to troubleshooting resources for precheck and migration errors.

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[gemini-code-assist]

Code Review

This pull request introduces two new documentation files for migrating data to TiDB Cloud Essential clusters. My review focuses on improving clarity, consistency, and adherence to the documentation style guide. The feedback includes correcting links to ensure they point to the appropriate 'Essential' cluster documentation, standardizing terminology for supported data sources and connectivity methods across both documents, fixing minor formatting issues such as non-breaking spaces and hyphens, and enhancing the clarity of several instructions to improve the user experience.

[Copilot]

Pull request overview

This PR adds comprehensive documentation for migrating data from MySQL-compatible databases to TiDB Cloud Essential using the Data Migration feature. The documentation covers both full migration (existing + incremental data) and incremental-only migration scenarios.

Changes:

• Added a comprehensive guide for migrating both existing and incremental data from MySQL-compatible databases to TiDB Cloud Essential
• Added a focused guide for migrating only incremental data from MySQL-compatible databases to TiDB Cloud Essential
• Updated the TOC to include the two new migration documents

Reviewed changes

Copilot reviewed 3 out of 3 changed files in this pull request and generated 8 comments.

File	Description
tidb-cloud/migrate-from-mysql-using-data-migration-essential.md	Main migration guide covering prerequisites, configuration, and step-by-step instructions for migrating existing and incremental data
tidb-cloud/migrate-incremental-data-from-mysql-using-data-migration-essential.md	Focused guide for incremental-only data migration with specific limitations and prerequisites
TOC-tidb-cloud-essential.md	Added entries for both new migration documents in the table of contents

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[ti-chi-bot]

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[hfxsd]

See this PR https://github.com/pingcap/docs/pull/22192/files#diff-7abeab80118e510f5b4a36f568d33048800451a877626b71b8010634bc39e60c