box.space._schema

box.space._schema¶

_schema is a system space.

This space contains the following tuples:

• version: version information for this Tarantool instance.
• cluster: the instance’s replica set ID.
• max_id (deprecated since 2.11.1): the maximal space ID. Use the box.space._space.index[0]:max() function instead.
• once...: tuples that correspond to specific box.once() blocks from the instance’s initialization file. The first field in these tuples contains the key value from the corresponding box.once() block prefixed with ‘once’ (e.g. oncehello), so you can easily find a tuple that corresponds to a specific box.once() block.

Example:

In the example, the _schema space contains two box.once objects – oncebye and oncehello.

tarantool> box.space._schema:select{}
---
- - ['cluster', 'b4e15788-d962-4442-892e-d6c1dd5d13f2']
  - ['max_id', 512]
  - ['oncebye']
  - ['oncehello']
  - ['version', 1, 7, 2]