Reorganization

Question

Hi,
I am New to SQL database.can anybody explain me the Reorganization procedure for SQL database?
Thanks in advance.
Vinnu.

Answer 1

A reorg in SQL means you reorder the leaf nodes of an index.  It works very well removing light fragmentation from an index.  It is less thorough then a full rebuild, but it is less intense and in SQL 2000 it won't lock the entire table during the operation, just the pages it is reorganizing.  In SQL 2005 it is a fully online operation.
In SQL 2000 you can do a reorg with the indexdefrag command
DBCC INDEXDEFRAG
    { 'database_name' | database_id | 0 }
        , { 'table_name' | table_id | 'view_name' | view_id }
    [ , { 'index_name' | index_id } [ , { partition_number | 0 } ] ]
    [ WITH NO_INFOMSGS ]
To rebuild the index in SQL 2000 (this is equivalent to a drop and create statement), you use the
DBCC DBREINDEX
        'table_name'
    [ , 'index_name' [ , fillfactor ] ]
    [ WITH NO_INFOMSGS ]
In SQL 2005 you use the alter index command...
ALTER INDEX { index_name | ALL }
    ON <object>
    { REBUILD
        [ [ WITH ( <rebuild_index_option> [ ,...n ] ) ]
          | [ PARTITION = partition_number
                [ WITH ( <single_partition_rebuild_index_option>
                        [ ,...n ] )
    | DISABLE
    | REORGANIZE
        [ PARTITION = partition_number ]
        [ WITH ( LOB_COMPACTION = { ON | OFF } ) ]
    | SET ( <set_index_option> [ ,...n ] )
<object> ::=
    [ database_name. [ schema_name ] . | schema_name. ]
        table_or_view_name
<rebuild_index_option > ::=
    PAD_INDEX  = { ON | OFF }
  | FILLFACTOR = fillfactor
  | SORT_IN_TEMPDB = { ON | OFF }
  | IGNORE_DUP_KEY = { ON | OFF }
  | STATISTICS_NORECOMPUTE = { ON | OFF }
  | ONLINE = { ON | OFF }
  | ALLOW_ROW_LOCKS = { ON | OFF }
  | ALLOW_PAGE_LOCKS = { ON | OFF }
  | MAXDOP = max_degree_of_parallelism
<single_partition_rebuild_index_option> ::=
    SORT_IN_TEMPDB = { ON | OFF }
  | MAXDOP = max_degree_of_parallelism
<set_index_option>::=
    ALLOW_ROW_LOCKS= { ON | OFF }
  | ALLOW_PAGE_LOCKS = { ON | OFF }
  | IGNORE_DUP_KEY = { ON | OFF }
  | STATISTICS_NORECOMPUTE = { ON | OFF }