Reviewing how database locks prevent financial transaction integrity issues

Database locks are essential for maintaining the integrity of financial transactions. They play a critical role in preventing conflicts and ensuring that concurrent access to data remains consistent. By controlling the simultaneous modification of shared resources, such as records or tables, locks ensure that transactions have exclusive access to the records they need (and ensure that the numbers add up correctly!). This helps maintain the accuracy and reliability of financial data by preventing data inconsistencies and conflicts.

Let’s go back to the table we created earlier, as shown in Figure 8.26. For instance, we need to update the price of the ticket for Conference X and add $10. A price increase of $10 is added depending on the demand:

Figure 8.26 – Current ticket prices

If only one person is making the change to the database, there would be no problem....