objs

Syntax

objs([shared=false])

Arguments

shared is Boolean variable.

  • false (default): return info on all variables in the current session

  • true: return info on all variables in the current session and variables shared by other sessions

Details

Obtain the information on the variables in memory. Return a table with the following columns:

  • name: variable name

  • type: data type

  • form: data form

  • rows:

    • If the data form is vector/dictionary/set, return the number of all elements (including NULL values);

    • If the data form is matrix/table, return the number of rows.

  • columns:

    • If the data form is vector/dictionary/set, return 1;

    • If the data form is matrix/table, return the number of columns.

  • bytes: the memory (in bytes) used by the variable

  • shared: whether it is a shared variable

  • extra: the logical path to the DFS table, in the format of “dfs://dbName/tableName”

Please note that the function does not return the function definitions. You can use defs to check function definitions, or memSize for the memory usage.

Examples

//create a DFS database
$ if(existsDatabase("dfs://listdb")){
$         dropDatabase("dfs://listdb")
$ }
$ n=1000000
$ ticker = rand(`MSFT`GOOG`FB`ORCL`IBM,n);
$ ticker[0..5]
$ x=rand(1.0, n)
$ t=table(ticker, x)
$ db=database(directory="dfs://listdb", partitionType=HASH, partitionScheme=[STRING, 5])
$ pt=db.createPartitionedTable(t, `pt, `ticker)
$ pt.append!(t)

// shared in-memory table
$ time = take(2021.08.20 00:00:00..2021.08.30 00:00:00, 40);
$ id = 0..39;
$ value = rand(100, 40);
$ tmp = table(time, id, value);
$ share tmp as st

// create set
$ s = set([1,2,3,4,5])

// create dict
$ x=1 2 3
$ y=4.5 7.8 4.3
$ z=dict(x,y);

// create matrix
$ m = matrix(1 2 3, 4 5 6)

// create pair
$ p = 1:2

$ objs(true)

name

type

form

rows

columns

bytes

shared

extra

n

INT

SCALAR

1

1

16

false

ticker

SYMBOL

VECTOR

1,000,000

1

4,000,000

false

x

INT

VECTOR

3

1

12

false

t

BASIC

TABLE

1,000,000

2

12,000,312

false

db

HANDLE

SCALAR

1

1

24

false

pt

ALIAS

TABLE

0

2

12,000,000

false

dfs://listdb/pt

time

DATETIME

VECTOR

40

1

160

false

id

INT

VECTOR

40

1

160

false

value

INT

VECTOR

40

1

160

false

tmp

BASIC

TABLE

40

3

832

false

s

INT

SET

5

1

28

false

y

DOUBLE

VECTOR

3

1

24

false

z

DOUBLE

DICTIONARY

3

1

199

false

m

INT

MATRIX

3

2

24

false

p

INT

PAIR

2

1

8

false

st

BASIC

TABLE

40

3

832

true