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IDS Forum

Table extents differences on recreate

Posted By: MURALI PAZHAYANNUR
Date: Monday, 8 October 2018, at 1:18 p.m.

When I recreate a table using the 'create table....as select from...' syntax, the new table gets created with the extent size/next size of 16/16. The original table has 13 extents, however, the new table is in 2 extents. This would not surprise me if the original table was small. In my case the original table/new has 14 million records. Why is the new table in 2 extents and its next size so large (see details below) despite the extent sizes being 16/16?

My colleague confirmed this with oncheck -pT

System Info: Informix 12.10.FC6, HP-UX 11.31.ia64

Here are the details (Sorry about the formatting mess here):

a. _fi_debt_price is fi_debt_price renamed.
b. fi_debt_price is created by:

create table dba.fi_debt_price_new as select * from dba._fi_debt_price;

rename table fi_debt_price_new to fi_debt_price;

_fi_debt_price (oncheck -pT)

TBLspace Report for evaluation:dba._fi_debt_price

Physical Address 25:3998735

Creation date 05/21/2011 12:35:11

TBLspace Flags 802 Row Locking

TBLspace use 4 bit bit-maps

Maximum row size 95

Number of special columns 0

Number of keys 0

Number of extents 13

Current serial value 1

Current SERIAL8 value 1

Current BIGSERIAL value 1

Current REFID value 1

Pagesize (k) 2

First extent size 30336

Next extent size 96256

Number of pages allocated 728192

Number of pages used 704305

Number of data pages 704130

Number of rows 14612101

Partition partnum 11534727

Partition lockid 11534727

Extents

Logical Page Physical Page Size Physical Pages

0 26:311298 222848 222848

222848 26:1983008 12032 12032

234880 26:2601949 12032 12032

246912 26:3228816 12032 12032

258944 26:4054671 12032 12032

270976 26:4887549 24064 24064

295040 32:1516317 48128 48128

343168 32:4448664 48128 48128

391296 25:946816 48128 48128

439424 39:461787 48128 48128

487552 39:3819044 48128 48128

535680 46:262467 96256 96256

631936 49:3008520 96256 96256

fi_debt_price (oncheck -pT)

TBLspace Report for evaluation:dba.fi_debt_price

Physical Address 49:4024583

Creation date 10/02/2018 13:15:18

TBLspace Flags 801 Page Locking

TBLspace use 4 bit bit-maps

Maximum row size 95

Number of special columns 0

Number of keys 0

Number of extents 2

Current serial value 1

Current SERIAL8 value 1

Current BIGSERIAL value 1

Current REFID value 1

Pagesize (k) 2

First extent size 8

Next extent size 131072

Number of pages allocated 786049

Number of pages used 730788

Number of data pages 730606

Number of rows 14612101

Partition partnum 11535665

Partition lockid 11535665

Extents

Logical Page Physical Page Size Physical Pages

0 54:1433687 4737 4737

4737 54:1454432 781312 781312

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