Size of a table (in bytes) in Q

Question

How can I read the size of a table (in bytes) in Q?

I know that hcount returns the size of a file in bytes, but I can't find something similar for tables (or in general any object...)

score 2 · Answer 1 · answered Jul 24 '18 at 08:51

2

−22!x is an optimised shortcut to count -8!x

q)(-22!trade)~count -8!trade
1b
q)\t:100 count -8!trade
3596
q)\t:100 -22!trade
839

answered Jul 24 '18 at 08:51

Mark Kelly

1,780
7
16

score 1 · Accepted Answer · answered Oct 03 '11 at 23:08

this is serialized (wire) object size
play around with \w this will give you object size in memory

q)a:til 10000
q)count -8!a
40014
q)\w
176464 67108864 67108864 0 0 2137387008j
q)b:til 10000
q)\w
242000 67108864 67108864 0 0 2137387008j
q)242000-176464
65536
q)\ts b,a
0 131200j
q)131248%2
65624f
q)

score 0 · Answer 3 · answered Jun 22 '11 at 13:44

0

After some searching, it appears that count -8!tablename does the trick.

answered Jun 22 '11 at 13:44

Chris Taylor

46,912
15
110
154

Size of a table (in bytes) in Q

3 Answers3