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IDS Forum

RE: Modify initial and next extents

Posted By: LARRY SORENSEN
Date: Tuesday, 22 February 2011, at 3:30 p.m.

In Response To: Modify initial and next extents (TRI TRINH)

Once created, there is no way to alter the initial extent without reloading. You would want to modify the next extent. Here are your options:

ALTER INDEX TO CLUSTER: Clustering an index rebuilds the table with the rows in index order in a different location within the dbspace. This cluster order is not respected in future updates, requiring that this be done periodically. For this to work, all indexes must be dropped, a single index clustered and the remaining indexes recreated. This command requires that there be sufficient space within the dbspace to create a copy of the original table. As the table grows and this process is repeated, allocation of new extents cannot be contiguous as the dbspace has holes left behind by the prior rebuild(s). The reality of this solution is that it requires a large amount of additional space to be maintained in the dbspace and it makes extent interleaving worse over time.

ALTER FRAGMENT: By modifying the fragmentation scheme, INFORMIX will rebuild the table, similar to option 1. For large tables, this is generally not a viable alternative, as too much free space is required and performance suffers when a temporary fragmentation scheme is employed.

UNLOAD / RELOAD DATA & DDL: You can unload the table, drop and re-create it, then reload the data. To perform this in a realistic time frame, all indexes must be removed before and recreated once reload is complete. In addition, by performing a DROP on the object, constraints, stored procedures and other related constructs need to be managed as well. This is a manual process which requires the maintenance of DDL for the table, correct sequencing of commands and the ability to control user access during the process. One wrong step and data or application logic contained in the database may be corrupted or lost. Even by performing this type of management, if more than one table exists in a dbspace the DBA may still incur extent interleaving if he does one object at a time.

Larry

> To: ids@iiug.org
> From: tri_trinh@hotmail.com
> Subject: Modify initial and next extents [22848]
> Date: Tue, 22 Feb 2011 15:01:07 -0500
>
> Hi,
>
> We have few tables with high numbers of extents. Some of the tables have up to
> 50s and 60s extents, and we want to reorg the tables. Beside SQL statement to
> alter the next extent size “ALTER TABLE ttipip503104 MODIFY NEXT SIZE 360”, is
> there any way we can modify the initial and next extents of the tables and
> their indexes without unload and reload?
>
> IDS 11.50.FC8
> OS: HPUX-11.11
>
> TBLspace Report for baan:baan.ttipip503104
>
> Physical Address 18:427406
>
> Creation date 11/24/2010 11:28:57
>
> TBLspace Flags 802 Row Locking
>
> TBLspace use 4 bit bit-maps
>
> Maximum row size 92
>
> Number of special columns 0
>
> Number of keys 0
>
> Number of extents 32
>
> Current serial value 1
>
> First extent size 4
>
> Next extent size 16
>
> Number of pages allocated 3592
>
> Number of pages used 3592
>
> Number of data pages 3577
>
> Number of rows 75090
>
> Partition partnum 7341643
>
> Partition lockid 7341643
>
> Extents
>
> Logical Page Physical Page Size Physical Pages
>
> 0 7:329400 4 4
>
> 4 7:427727 4 4
>
> 8 7:428077 4 4
>
> 12 7:509595 4 4
>
> 16 7:584469 4 4
>
> 20 7:584739 4 4
>
> 24 7:585862 4 4
>
> 28 7:586026 4 4
>
> 32 7:587506 4 4
>
> 36 7:590261 4 4
>
> 40 7:593531 12 12
>
> 52 7:597216 4 4
>
> 56 7:597265 4 4
>
> 60 7:597774 12 12
>
> 72 7:930695 12 12
>
> 84 7:931251 4 4
>
> 88 7:941904 8 8
>
> 96 7:943017 8 8
>
> 104 7:1000163 280 280
>
> 384 7:1001277 16 16
>
> 400 16:14021 48 48
>
> 448 16:138067 8 8
>
> 456 16:138306 1408 1408
>
> 1864 16:140228 72 72
>
> 1936 16:378667 96 96
>
> 2032 16:386091 104 104
>
> 2136 16:769924 176 176
>
> 2312 16:813437 512 512
>
> 2824 16:814349 88 88
>
> 2912 16:897377 48 48
>
> 2960 16:944183 400 400
>
> 3360 21:1022845 232 232
>
> Index tipip5031041abaan fragment partition index1 in DBspace index1
>
> Physical Address 58:588683
>
> Creation date 11/24/2010 11:28:57
>
> TBLspace Flags 802 Row Locking
>
> TBLspace use 4 bit bit-maps
>
> Maximum row size 92
>
> Number of special columns 0
>
> Number of keys 1
>
> Number of extents 35
>
> Current serial value 1
>
> First extent size 4
>
> Next extent size 16
>
> Number of pages allocated 1952
>
> Number of pages used 1940
>
> Number of data pages 0
>
> Number of rows 0
>
> Partition partnum 9440345
>
> Partition lockid 7341643
>
> Extents
>
> Logical Page Physical Page Size Physical Pages
>
> 0 9:382431 4 4
>
> 4 53:644804 4 4
>
> 8 53:644931 4 4
>
> 12 53:645329 4 4
>
> 16 53:645643 4 4
>
> 20 53:646261 4 4
>
> 24 53:646324 4 4
>
> 28 53:646496 4 4
>
> 32 53:646517 4 4
>
> 36 53:646615 4 4
>
> 40 53:646778 4 4
>
> 44 53:646958 4 4
>
> 48 53:647031 4 4
>
> 52 53:647159 4 4
>
> 56 53:647188 4 4
>
> 60 53:647380 4 4
>
> 64 53:865362 8 8
>
> 72 53:898571 8 8
>
> 80 53:898587 8 8
>
> 88 53:924184 16 16
>
> 104 53:1023990 8 8
>
> 112 54:173987 248 248
>
> 360 54:174532 32 32
>
> 392 54:174574 696 696
>
> 1088 54:217136 24 24
>
> 1112 54:309990 32 32
>
> 1144 54:332909 88 88
>
> 1232 54:341277 584 584
>
> 1816 54:417268 8 8
>
> 1824 54:417781 8 8
>
> 1832 54:418244 16 16
>
> 1848 54:418585 8 8
>
> 1856 54:418716 16 16
>
> 1872 54:419704 48 48
>
> 1920 54:420764 32 32
>
>
> *******************************************************************************
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