Update migrate-large-mysql-to-tidb.md (#22106)

[ti-chi-bot]

This is an automated cherry-pick of #22106

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• This PR is translated from:Update migrate-large-mysql-to-tidb.md docs-cn#21135
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• Delete files
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[gemini-code-assist]

Summary of Changes

Hello @ti-chi-bot, 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 refines the documentation for migrating large MySQL databases to TiDB, specifically focusing on the tidb-lightning tool. The changes aim to enhance the reliability of the tidb-lightning startup process by providing a more robust method for execution, particularly when integrating with S3 storage and managing process signals, thereby preventing unexpected terminations and ensuring proper credential handling.

Highlights

• Improved tidb-lightning startup instructions: The documentation for starting tidb-lightning has been updated to provide clearer guidance on process management.
• Discouraged direct nohup usage: The previous recommendation to directly use nohup from the command line for tidb-lightning has been revised, advising against it to prevent unexpected exits.
• Provided script example for tidb-lightning: A new shell script example is included, demonstrating a more robust way to start tidb-lightning using nohup, especially when handling S3 credentials.

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[gemini-code-assist]

Code Review

This pull request updates the documentation to recommend using a shell script for running tidb-lightning with nohup. This is a good change that promotes better practices. My feedback includes a suggestion to make the instructions more explicit, ensuring clarity for all users, which aligns with the repository's style guide.

[hfxsd]

/approve

[ti-chi-bot]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: hfxsd

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