bai @rjbhern, unsai mahatag nimo nga advice regarding pag reorganize or rebuild sa fragmented indexes?
bai @rjbhern, unsai mahatag nimo nga advice regarding pag reorganize or rebuild sa fragmented indexes?
wa kaayo ko mahatag ana nga idea bai... c sir @defender rajud atong pag.asa ana... by the way bai, katong g.tudlo nga audit ... working rato nimo?
up nato ni bai... asa naman kaha c sir @defender ron sa?
mga boss sensya kaayo ninyo kung karon pako ka online...kay busy lang.....kay i was in singapore my boss told me that i will be one of the speakers there....
from now on i will be giving scripts to help my fellow DB administrator....especially atong mga newbie pa sa DB admin.
God bless....
Last edited by defender_1611; 05-29-2015 at 10:32 PM.
@nyor
Before learning to eliminate fragmentation, you should have a clear understanding of the types of fragmentation. We can classify fragmentation into two types:
Internal Fragmentation: When records are stored non-contiguously inside the page, then it is called internal fragmentation. In other words, internal fragmentation is said to occur if there is unused space between records in a page. This fragmentation occurs through the process of data modifications (INSERT, UPDATE, and DELETE statements) that are made against the table and therefore, to the indexes defined on the table. As these modifications are not equally distributed among the rows of the table and indexes, the fullness of each page can vary over time. This unused space causes poor cache utilization and more I/O, which ultimately leads to poor query performance.
External Fragmentation: When on disk, the physical storage of pages and extents is not contiguous. When the extents of a table are not physically stored contiguously on disk, switching from one extent to another causes higher disk rotations, and this is called Extent Fragmentation.
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