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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

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