Each row returned by the sa_table_stats procedure describes a table for which the optimizer is maintaining page statistics.
The sa_table_stats procedure can be used to find which tables are using cache memory and how many disk reads are being performed
for each table. For example, you can use the sa_table_stats procedure to find the table that is generating the most disk reads.
The results of the procedure represent estimates and should be used only for diagnostic purposes.
The table_page_cached column indicates how many pages of the table are currently stored in the cache, and the table_page_reads
column indicates how many table pages have been read from disk since the optimizer started maintaining counts for the table.
These statistics are not stored persistently within the database; they represent the activity on tables after they are loaded
into memory for the first time.