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box.space._space
``_space`` is a system space. It contains all spaces hosted on the current Tarantool instance, both system ones and created by users.
Tuples in this space contain the following fields:
``id``,
``owner`` (= id of user who owns the space),
``name``, ``engine``, ``field_count``,
``flags`` (e.g. temporary),
``format`` (as made by a :doc:`format clause </reference/reference_lua/box_space/format>`).
These fields are established by :doc:`/reference/reference_lua/box_schema/space_create`.
**Example #1:**
The following function will display every simple field in all tuples of ``_space``.
function example()
local ta = {}
local i, line
for k, v in box.space._space:pairs() do
i = 1
line = ''
while i <= #v do
if type(v[i]) ~= 'table' then
line = line .. v[i] .. ' '
end
i = i + 1
end
table.insert(ta, line)
end
return ta
end
Here is what ``example()`` returns in a typical installation:
tarantool> example()
---
- - '272 1 _schema memtx 0 '
- '280 1 _space memtx 0 '
- '281 1 _vspace sysview 0 '
- '288 1 _index memtx 0 '
- '296 1 _func memtx 0 '
- '304 1 _user memtx 0 '
- '305 1 _vuser sysview 0 '
- '312 1 _priv memtx 0 '
- '313 1 _vpriv sysview 0 '
- '320 1 _cluster memtx 0 '
- '512 1 tester memtx 0 '
- '513 1 origin vinyl 0 '
- '514 1 archive memtx 0 '
...
**Example #2:**
The following requests will create a space using ``box.schema.space.create()`` with a :doc:`format clause </reference/reference_lua/box_space/format>`, then retrieve the ``_space`` tuple for the new space. This illustrates the typical use of the ``format`` clause, it shows the recommended names and data types for the fields.
tarantool> box.schema.space.create('TM', {
> id = 12345,
> format = {
> [1] = {["name"] = "field_1"},
> [2] = {["type"] = "unsigned"}
> }
> })
---
- index: []
on_replace: 'function: 0x41c67338'
temporary: false
id: 12345
engine: memtx
enabled: false
name: TM
field_count: 0
- created
...
tarantool> box.space._space:select(12345)
---
- - [12345, 1, 'TM', 'memtx', 0, {}, [{'name': 'field_1'}, {'type': 'unsigned'}]]
...
The :ref:`system space view <box_space-sysviews>` for ``_space`` is ``_vspace``.

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testing_project / Documentation: reference/reference_lua/box_space/_space — English

tarantool> example()
---
- - '272 1 _schema memtx 0 '
- '280 1 _space memtx 0 '
- '281 1 _vspace sysview 0 '
- '288 1 _index memtx 0 '
- '296 1 _func memtx 0 '
- '304 1 _user memtx 0 '
- '305 1 _vuser sysview 0 '
- '312 1 _priv memtx 0 '
- '313 1 _vpriv sysview 0 '
- '320 1 _cluster memtx 0 '
- '512 1 tester memtx 0 '
- '513 1 origin vinyl 0 '
- '514 1 archive memtx 0 '
...
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