Save 
Join IIUG
 for   
 

Informix News
18 Nov 13 - ZDNet - Top 20 mobile skills in demand... Read
09 Sep 13 - telecompaper - Shaspa and Tatung have shown a new smart home platform at Ifa in Berlin. Powered by the IBM Informix software... Read
06 Sep 13 - IBM data magazine - Mission Accomplished - Miami, Florida will be the backdrop for the 2014 IIUG Informix Conference... Read
01 Feb 13 - IBM Data Magazine - Are your database backups safe? Lester Knutsen (IBM Champion) writes about database back up safety using "archecker"... Read
14 Nov 12 - IBM - IBM's Big Data For Smart Grid Goes Live In Texas... Read
3 Oct 12 - The Financial - IBM and TransWorks Collaborate to Help Louisiana-Pacific Corporation Achieve Supply Chain Efficiency... Read
28 Aug 12 - techCLOUD9 - Splunk kicks up a SaaS Storm... Read
10 Aug 12 - businessCLOUD9 - Is this the other half of Cloud monitoring?... Read
3 Aug 12 - IBM data management - Supercharging the data warehouse while keeping costs down IBM Informix Warehouse Accelerator (IWA) delivers superior performance for in-memory analytics processing... Read
2 Aug 12 - channelbiz - Oninit Group launches Pay Per Pulse cloud-based service... Read
28 May 12 - Bloor - David Norfolk on the recent Informix benchmark "pretty impressive results"... Read
23 May 12 - DBTA - Informix Genero: A Way to Modernize Informix 4GL Applications... Read
9 Apr 12 - Mastering Data Management - Upping the Informix Ante: Advanced Data Tools... Read
22 Mar 12 - developerWorks - Optimizing Informix database access... Read
14 Mar 12 - BernieSpang.com - International Informix User Group set to meet in San Diego... Read
1 Mar 12 - IBM Data Management - IIUG Heads West for 2012 - Get ready for sun and sand in San Diego... Read
1 Mar 12 - IBM Data Management - Running Informix on Solid-State Drives.Speed Up Database Access... Read
26 Feb 12 - BernieSpan.com - Better results, lower cost for a broad set of new IBM clients and partners... Read
24 Feb 12 - developerWorks - Informix Warehouse Accelerator: Continuous Acceleration during Data Refresh... Read
6 Feb 12 - PRLOG - Informix port delivers unlimited database scalability for popular SaaS application ... Read
2 Feb 12 - developerWorks - Loading data with the IBM Informix TimeSeries Plug-in for Data Studio... Read
1 Feb 12 - developerWorks - 100 Tech Tips, #47: Log-in to Fix Central... Read
13 Jan 12 - MC Press online - Informix Dynamic Server Entices New Users with Free Production Edition ... Read
11 Jan 12 - Computerworld - Ecologic Analytics and Landis+Gyr -- Suitors Decide to Tie the Knot... Read
9 Jan 12 - planetIDS.com - DNS impact on Informix / Impacto do DNS no Informix... Read
8 Sep 11 - TMCnet.com - IBM Offers Database Solution to Enable Smart Meter Data Capture... Read
1 Aug 11 - IBM Data Management Magazine - IIUG user view: Happy 10th anniversary to IBM and Informix... Read
8 Jul 11 - Database Trends and Applications - Managing Time Series Data with Informix... Read
31 May 11 - Smart Grid - The meter data management pitfall utilities are overlooking... Read
27 May 11 - IBM Data Management Magazine - IIUG user view: Big data, big time ( Series data, warehouse acceleration, and 4GLs )... Read
16 May 11 - Business Wire - HiT Software Announces DBMoto for Enterprise Integration, Adds Informix. Log-based Change Data Capture... Read
21 Mar 11 - Yahoo! Finance - IBM and Cable&Wireless Worldwide Announce UK Smart Energy Cloud... Read
14 Mar 11 - MarketWatch - Fuzzy Logix and IBM Unveil In-Database Analytics for IBM Informix... Read
11 Mar 11 - InvestorPlace - It's Time to Give IBM Props: How many tech stocks are up 53% since the dot-com boom?... Read
9 Mar 11 - DBTA - Database Administration and the Goal of Diminishing Downtime... Read
2 Feb 11 - DBTAs - Informix 11.7 Flexible Grid Provides a Different Way of Looking at Database Servers... Read
27 Jan 11 - exactsolutions - Exact to Add Informix Support to Database Replay, SQL Monitoring Solutions... Read
25 Jan 11 - PR Newswire - Bank of China in the UK Works With IBM to Become a Smarter, Greener Bank... Read
12 Oct 10 - Database Trends and Applications - Informix 11.7: The Beginning of the Next Decade of IBM Informix... Read
20 Sep 10 - planetIDS.com - ITG analyst paper: Cost/Benefit case for IBM Informix as compared to Microsoft SQL Server... Read
20 Jul 10 - IBM Announcements - IBM Informix Choice Edition V11.50 helps deploy low-cost scalable and reliable solutions for Apple Macintosh and Microsoft Windows... Read
20 Jul 10 - IBM Announcements - Software withdrawal: Elite Support for Informix Ultimate-C Edition... Read
24 May 10 - eWeek Europe - IBM Supplies Database Tech For EU Smart Grid... Read
23 May 10 - SiliconIndia - IBM's smart metering system allows wise use of energy... Read
21 May 10 - CNET - IBM to help people monitor energy use... Read
20 May 10 - ebiz - IBM Teams With Hildebrand To Bring Smart Metering To Homes Across Britain... Read
19 May 10 - The New Blog Times - Misurare il consumo energetico: DEHEMS è pronto... Read
19 May 10 - ZDNet - IBM software in your home? Pact enables five-city smart meter pilot in Europe... Read
17 March 10 - ZDNet (blog) David Morgenstern - TCO: New research finds Macs in the enterprise easier, cheaper to manage than... Read
17 March 2010 - Virtualization Review - ...key components of Big Blue's platform to the commercial cloud such as its WebSphere suite of application ser vers and its DB2 and Informix databases... Read
10 February 2010 - The Wall Street Journal - International Business Machines is expanding an initiative to win over students and professors on its products. How do they lure the college crowd?... Read


End of Support Dates

IIUG on Facebook IIUG on Twitter

[ View Thread ] [ Post Response ] [ Return to Index ] [ Read Prev Msg ] [ Read Next Msg ]

IDS Forum

Re: Outrageous Extent sizes

Posted By: MICHAEL HOFFMAN
Date: Thursday, 24 August 2017, at 1:48 p.m.

In Response To: Re: Outrageous Extent sizes (MICHAEL HOFFMAN)

Evidence of runaway extents for Table C:
From sysmaster.sysptext table, you see the sizes double at regular intervals (nearly every 16th, as expected). Then the extent sizes are all over the place due to lack of contiguous free space to hold a larger extent. Understandable! But then the final extent allocated is so incredibly large compared to any others (80MB --> 640MB!).

But now I see .... even though the document says the doubling happens at *every allocation*, it still seems to have an "every 16th" pattern. At 128 extents, the size has doubled to 640MB. So at extent 160, the doubling could take it to 2.5GB, but since 640MB would provide more than 10% free of the overall table size, Informix stops there.

This aggressive approach can be a real headache for DBAs running on systems that are space-constrained. A large table that rarely grabs a new extent can all of a sudden snag a HUGE amount of space, even if the table is rarely written to.

And does the NEXT EXTENT have *any* meaning at all anymore?

pe_extnum pe_chunk pe_size
---------- -------- --------

0 30 8

1 48 796160

2 30 1280

3 30 1280

4 30 1280

5 30 1280

6 30 1280

7 30 1280

8 30 1280

9 30 1280

10 30 1280

11 30 1280

12 30 1280

13 30 1280

14 30 1280

15 30 1280

16 30 2560

17 30 2560

18 30 2560

19 30 2560

20 30 2560

21 30 2560

22 30 2560

23 30 2560

24 30 2560

25 30 2560

26 30 2560

27 30 2560

28 30 5120

29 30 2560

30 30 5120

31 30 2560

32 30 5120

33 38 5120

34 38 5120

35 38 5120

36 38 5120

37 38 5120

38 38 5120

39 38 5120

40 38 5120

41 38 5120

42 38 5120

43 38 5120

44 38 5120

45 38 5120

46 38 5120

47 38 5120

48 38 10240

49 38 10240

50 38 10240

51 38 10240

52 48 10240

53 48 10240

54 48 10240

55 48 10240

56 48 10240

57 48 10240

58 48 10240

59 48 10240

60 48 10240

61 48 10240

62 48 10240

63 48 10240

64 48 20480

65 48 20480

66 55 20480

67 55 20480

68 55 20480

69 55 20480

70 55 20480

71 55 20480

72 55 20480

73 55 20480

74 55 20480

75 55 20480

76 30 20480

77 30 20480

78 30 20480

79 30 20480

80 38 40960

81 48 40960

82 48 40960

83 55 40960

84 55 40960

85 55 40960

86 55 40960

87 55 40960

88 55 40960

89 55 40960

90 55 40960

91 48 30976

92 38 19484

93 48 18048

94 48 16416

95 38 16023

96 55 15182

97 48 13823

98 38 13048

99 38 12288

100 48 11248

101 38 10876

102 48 9846

103 48 9524

104 38 8262

105 48 8040

106 48 7765

107 38 6854

108 48 6391

109 30 6263

110 48 6152

111 38 5760

112 55 5572

113 38 5442

114 38 5146

115 38 4842

116 55 4704

117 55 4589

118 48 4464

119 48 4272

120 30 4096

121 55 4096

122 48 3978

123 48 3936

124 38 3530

125 38 3264

126 48 3121

127 30 3087

128 38 3084

129 38 3072

130 38 3008

131 48 2868

132 55 2680

133 48 2640

134 48 2608

135 38 2495

136 48 2372

137 38 2280

138 48 2235

139 38 2158

140 38 2024

141 30 1870

142 38 1715

143 38 1681

144 30 1628

145 48 1608

146 48 1600

147 48 1540

148 48 1534

149 38 1450

150 48 1419

151 48 1408

152 30 1376

153 48 1328

154 38 1282

155 30 1206

156 30 1144

157 48 1069

158 30 1068

159 38 1068

160 76 327680

> --------------------------------------------
> Thanks Art. That helps explain part of the issue -- especially with the
> larger table. 976.5 MB *2 = 1.90 GB.
>
> However, the smaller table still makes no sense. And now I have evidence
> of another table having the same issue.
>
> Table C: 4.3 GB needing another extent. NEXT size is 2.5 MB.
>
> According to the document, the NEXT size should be doubled, up to 128KB,
> and once there, doubled only when "the remaining space in the table is
> less than 10% of the total allocated space in the table".
>
> So the NEXT extent should be 5 MB, right? Well then, why is the new extent
> **640 MB**? That is 15% of the table size.
>
> Is Informix continuing to double the NEXT size until it crosses the 10%
> threshold before actually allocating the extent?
>
> That would actually explain the behavior for Table A as well (1.25GB is 13%
> of 9.5GB)
>
> The documentation is definitely not clear on this. (Not to mention the
> potentially wasted Free space for tables that may be front-loaded with data,
> but barely grow in the future.)
>
> Thanks,
> Michael

Messages In This Thread

[ View Thread ] [ Post Response ] [ Return to Index ] [ Read Prev Msg ] [ Read Next Msg ]

IDS Forum is maintained by Administrator with WebBBS 5.12.