Upgrade schema for cell1, including upgrading tables extent sizes and modifying old table structures.
升级cell1的模式，包含升级表扩展大小和修改原表结构。
Creating the new table to hold sensitive salary information and migrating data from the old table to this new one.
创建用于存放敏感薪水信息的新表，并将数据从旧表迁移到新表。
The old table transition table holds the original state of the affected rows before they are processed by the UPDATE or DELETE statement.
OLD TABLE过渡表保存了受影响的行在被update或delete语句处理之前的初始状态。
Deleting the sensitive columns from the old table and preserving the data from those columns for audit purposes or to ensure the ability to do an undo.
从旧表中删除敏感列，并保留那些列中的数据，以便用于审计或者确保可以执行撤销。
Deleting the sensitive columns from the old table and preserving the data from those columns for audit purposes or to ensure the ability to do an undo.
从旧表中删除敏感列，并保留那些列中的数据，以便用于审计或者确保可以执行撤销。
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