What potential issues can arise when trying to access specific entries in a large database using PHP?

One potential issue when trying to access specific entries in a large database using PHP is slow performance due to inefficient queries. To solve this, you can optimize your queries by using indexes on columns frequently used in WHERE clauses. 

// Example of optimizing query with indexes
$sql = "SELECT * FROM users WHERE username = 'john_doe'";
// Add an index on the 'username' column in the 'users' table
// ALTER TABLE users ADD INDEX username_index (username);

Keywords

SQL injection memory exhaustion timeout indexing pagination

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