I would like to use removable hard disk drive (portable hard disk) for iphone because of many data, report and so on. I want to receive data for e-mail, so the iphone holds large amounts of data for a long time, and i want to use its at any time

nowadays, people use removable hard disk drive (portable hard disk) & usb flash drive at computer because of usability, easy to carry around.
so, i would like to use these functions for iphone. i want to develop mini portable hard disk for the use of iphone like computer

Not a feature of iphone.

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    All,
    I have several tables that have about 1 million plus rows of historical data that is no longer needed and I am considering deleting the data. I have heard that deleting the data will actually slow down performance as it will mess up the indexing, is this true? What if I recalculate statistics after deleting the data? In general, I am looking for advice what is best practices for deleting large amounts of data from tables.
    For everyones reference I am running Oracle 9.2.0.1.0 on Solaris 9. Thanks in advance for the advice.
    Thanks in advance!
    Ron

    Another problem with delete is that it generates a vast amount of redo log (and archived logs) information . The better way to get rid of the unneeded data would be to use TRUNCATE command:
    http://download-west.oracle.com/docs/cd/B10501_01/server.920/a96540/statements_107a.htm#2067573
    The problem with truncate that it removes all the data from the table. In order to save some data from the table you can do next thing:
    1. create another_table as select * from &lt;main_table&gt; where &lt;data you want to keep clause&gt;
    2. save the indexes, constraints, trigger definitions, grants from the main_table
    3. drop the main table
    4. rename &lt;stage_table&gt; to &lt;main_table&gt;.
    5. recreate indexes, constraints and triggers.
    Another method is to use partitioning to partition the data based on the key (you've mentioned "historical" - the key could be some date column). Then you can drop the historical data partitions when you need it.
    As far as your question about recalculating the statistics - it will not release the storage allocated for index. You'll need to execute ALTER INDEX &lt;index_name&gt; REBUILD :
    http://download-west.oracle.com/docs/cd/B10501_01/server.920/a96540/statements_18a.htm
    Mike

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