text: **4.2 Main data table structures**
  
  The Content Manager OnDemand data tables can grow rapidly. You must understand the 
  structure of the data tables and the relationships between them. 
  
  Two important tables exist that you must examine here: the*segment table*(ARSSEG) and the 
  *application group data table*(ag_internal_id). The segment table contains one row for each 
  segment of each application group data table. Table 4-2 shows the first four columns of the 
  ARSSEG table structure. 
  
  *Table 4-2 ARSSEG table structure*
  
  <html>
          <head> <meta charset="UTF-8">
          <style>
          table, th, td {
              border: 1px solid black;
              font-size: 10px;
          }
          </style> </head>
          <body>
          <table frame="hsides" rules="groups" width="100%%">
              [html]<thead><tr><td>Column name</td><td>Description</td></tr></thead><tbody><tr><td>agid</td><td>Application group ID</td></tr><tr><td>table_name</td><td>Application group segment table name</td></tr><tr><td>start_date</td><td>Segment start date</td></tr><tr><td>stop_date</td><td>Segment stop date</td></tr></tbody>
          </table> </body> </html>