How to compare identical databases in the same table? (如何比对同一张表的相同数据库)

How to Compare Identical Databases in the Same Table?

Database comparison is a crucial and mandatory practice to ensure the quality and consistency of a database. Identical databases in the same table may require a comparison to balance the data and avoid any discrepancies. The comparison helps detect any changes made to the database and solve the issues found. This article will guide you on how to compare identical databases in the same table.

Step 1: Understand the Databases

Before comparing the identical databases, it is essential to understand the databases you are comparing. Understanding the table structure, data types, and data values are key components to compare identical databases. Ensure that the database design for both is the same or at least compatible to enable easy and meaningful comparison.

Step 2: Select the Data Comparison tool

Several data comparison tools are avlable for comparing identical databases, including:

1. WinMerge: it is a robust open-source tool that compares files and folders. It highlights changes in the database, and this enables you to identify discrepancies and better solve any issues found.

2. SQL Data Compare: this is a pd tool from RedGate that has proven reliable for comparing databases of all kinds, including identical ones. It runs a comparison script that detects differences in the databases and directs you on how to solve the disparities found.

3. SQL Server Data Tools (SSDT): it is a free tool that enables database comparisons between the databases in the same instance. It has features such as schema comparison and data comparison, among others.

Step 3: Preparing the Databases for Comparison

It is important to prepare the databases before you start comparing them. The following steps serve as a guide:

1. Ensure that both databases are similar or identical in design, structure, data types, and data values.

2. Make a copy or backup of the two identical databases before the comparison.

3. Set up the comparison tool and connect to the two databases in question (databases names and server host).

4. Specify which data tables to compare or choose the entire database.

Step 4: Compare the Identical Databases

After preparing the databases, proceed to compare them using the data comparison tool. The following steps serve as a guide:

1. Select the data comparison tool and launch it.

2. After launching the tool, select the option for identical databases and select the databases to compare.

3. The tool prompts you to verify the databases to compare. Ensure that you select the right databases, and then click the compare button.

4. Wt for the tool to compare the databases. It may take some time, depending on the size of the databases.

5. After the comparison, the tool gives you a report that highlights the differences between the databases.

Step 5: Solve the Discrepancies

After comparing the identical databases, the tool lists the differences found. The differences could be in the structure, data types, or values of the data. Here are the steps to solve the differences:

1. Review the differences found by the tool and identify the critical disparities.

2. For every difference, decide the best way to align and balance the data. It may involve either deleting or updating the data values, or adding new data.

3. Apply the necessary updates to achieve consistency between the two identical databases.

4. After making changes, run the comparison tool agn to confirm that both databases are identical.

Conclusion

Comparing identical databases can help identify and solve any discrepancies that may hinder the quality and consistency of a database. It is essential to understand the databases, select a reliable data comparison tool, prepare the databases, and compare the databases. Solving the differences found after the comparison leads to a ooth and effective database system.