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Okay, let's delve into the process of determining the size of all tables in a database. We'll cover various database systems, explain the underlying principles, provide code examples, and discuss important considerations.

*Understanding the Fundamentals*

Before we dive into the code, it's crucial to understand what we're measuring and how databases store data.

*Data Storage:* Databases typically store data in two primary forms:
*Data Pages:* These are the actual storage units that hold the rows of your tables. The size of a data page is usually fixed for a particular database (e.g., 8KB, 16KB).
*Indexes:* Indexes are special data structures that speed up query execution. They are essentially lookup tables that allow the database to quickly locate specific rows without scanning the entire table. Indexes also consume storage space.
*Measuring Table Size:* The total size of a table consists of:
The space occupied by the table's data pages.
The space occupied by all indexes associated with the table.
*Database-Specific Metrics:* Different database systems use different terminology and metrics for reporting table sizes. Common metrics include:
*Data Size:* The space used by the table's data itself.
*Index Size:* The space used by the table's indexes.
*Reserved Space:* The total space allocated to the table, which may be greater than the actual data and index size. This reserved space can include empty pages or pages that are partially filled.
*Used Space:* The space that actually contains data, indexes, or other database objects.
*Units of Measurement:* Size is typically expressed in kilobytes (KB), megabytes (MB), gigabytes (GB), or terabytes (TB).

*General Approach*

The general approach to getting the size of all tables involves the following steps:

1. *Connect to the Database:* Establish a connection to the database server using appropriate credenti ...

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