The Manual Defrag section of the index maintenance dashboard allows you to see index fragmentation levels across your SQL Server estate and defragment where necessary with a single click.
The section is divided into 2 tabs, Analysis
The Analysis tab helps you see exactly how fragmented indexes are. Once this is known then the Defragment tab helps you perform the actual defragmentation.
Below is a screenshot of the Analysis tab:
The main grid is populated by selecting SQL Server objects in the left hand "Index Maintenance" pane. In the screenshot the whole SQL Server has been selected so all indexes in all databases are shown in the grid. Selecting databases, tables or individual indexes in the left tab will update what is shown in the main grid.
Initially each index has a status of "Not-Analyzed" and it's fragmentation % will be unknown or "?". Clicking the "Start Frag Analysis" button will detect the fragmentation % and determine the action to take for each index. The action to take is determined by the rebuild and reorganize thresholds you specify above the grid.
If the fragmentation % is less than the reorganize threshold then no action is taken. If it is over the reorganize threshold but below the rebuild threshold then it is reorganized. If above the rebuild threshold then it is rebuilt.
When analysis is complete and if you want to rebuild or reorgaize any indexes then click over to the Defragment
tab to take action:
This tab is designed to help you concentrate only on indexes that need rebuilding or reorganizing and show the benefits of doing so. The results of the index analysis are shown here.
The same threshold options are found here - if you update their values you will see the Action column for each index will change as the thresholds pass the indexes fragmentation level. Also sort in tempdb and online rebuild options are included for the defragmentation operations that will occurr.
Click the "Start De-Frag" button to commence miniDBA iterating through the indexes and performing the appropriate operation on each one. The status will change from Defragged to defragged and Analysed after each operation. The final analysis operation after the defragment is performed in order to see the new hopefully lower level of fragmentation. The new fragmentation level is shown in the "New Frag %" column and can be compared to the "Original Frag %" column.
The "Defrag Seconds" column is populated after fragmentation has occurred and is designed to help you have an idea of how long an index rebuild takes for that individual index. That time may influence how often you run defragmentation jobs on it in the future as defragmentation can negativly effect SQL Server performance.
To setup index defragmentation jobs in the Scheduled Jobs
tab please see Index Defragmentation Jobs