How Can I Efficiently Display the Last Update Time of a MySQL Table?

Effective method to get the last update time of a MySQL table

You want to display the latest update date of a specific MySQL table in the footer of the page. It is critical to know the most efficient way to obtain this information.

Leveraging MySQL Information Architecture

Newer MySQL versions provide a solution: query the information_schema database. This provides the last updated time of the table:

<code class="language-sql">SELECT UPDATE_TIME
FROM information_schema.tables
WHERE TABLE_SCHEMA = 'dbname'
AND TABLE_NAME = 'tabname';</code>

While this method provides accurate information, it requires establishing a database connection every time.

Use file timestamps

Another approach is to maintain a file timestamp that is updated every time the MySQL table is modified. The steps are as follows:

Database update:

• Open the timestamp file in read-write mode.
• Close the file immediately.
• Alternatively, use PHP’s touch() function to update the file timestamp.

Page display:

• Use stat() to retrieve the file modification time and display it as "Last Updated" in the footer.

This method avoids database connections and provides a simple way to track table updates.

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