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Troubleshooting guide
Problem: INSERT/UPDATE-requests result in ER_MEMORY_ISSUE error
**Possible reasons**
Lack of RAM (parameters ``arena_used_ratio`` and ``quota_used_ratio`` in :doc:`/reference/reference_lua/box_slab/slab_info` report are getting close to 100%).
To check these parameters, say:
$ # attaching to a Tarantool instance
$ tt connect <instance_name|URI>
-- requesting arena_used_ratio value
tarantool> box.slab.info().arena_used_ratio

-- requesting quota_used_ratio value
tarantool> box.slab.info().quota_used_ratio
**Solution**
Try either of the following measures:
In Tarantool's :ref:`instance file <admin-instance_config>`, increase the value of :ref:`box.cfg{memtx_memory} <cfg_storage-memtx_memory>` (if memory resources are available).
In versions of Tarantool before 1.10, the server needs to be restarted to change this parameter. The Tarantool server will be unavailable while restarting from .xlog files, unless you restart it using :ref:`hot standby <index-hot_standby>` mode. In the latter case, nearly 100% server availability is guaranteed.
Clean up the database.
Check the indicators of memory fragmentation:
-- requesting quota_used_ratio value
tarantool> box.slab.info().quota_used_ratio

-- requesting items_used_ratio value
tarantool> box.slab.info().items_used_ratio
In case of heavy memory fragmentation (``quota_used_ratio`` is getting close to 100%, ``items_used_ratio`` is about 50%), we recommend restarting Tarantool in the :ref:`hot standby <index-hot_standby>` mode.
Problem: Tarantool generates too heavy CPU load
The :ref:`transaction processor thread <thread_model>` consumes over 60% CPU.
Attach to the Tarantool instance with :ref:`tt <tt-cli>` utility, analyze the query statistics with :doc:`box.stat() </reference/reference_lua/box_stat>` and spot the CPU consumption leader. The following commands can help:
-- checking the RPS of calling stored procedures
tarantool> box.stat().CALL.rps
The critical RPS value is 75 000, boiling down to 10 000 - 20 000 for a rich Lua application (a Lua module of 200+ lines).
-- checking RPS per query type
tarantool> box.stat().<query_type>.rps
The critical RPS value for SELECT/INSERT/UPDATE/DELETE requests is 100 000.

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testing_project / Documentation: book/admin/troubleshoot — English

-- requesting arena_used_ratio value
tarantool> box.slab.info().arena_used_ratio

-- requesting quota_used_ratio value
tarantool> box.slab.info().quota_used_ratio
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