5.4. Status variables — Mroonga vmrn_version documentation

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# 5.4. Status variables

Here are the explanations of status variables that are introduced by Mroonga.

## 5.4.1. `Mroonga_count_skip`

This value is increased when ‘fast line count feature’ is used. You can use this value to check if the feature is working when you enable it.

Here is an example how to check it:

    mysql> SHOW STATUS LIKE 'Mroonga_count_skip';
    +--------------------+-------+
    | Variable_name      | Value |
    +--------------------+-------+
    | Mroonga_count_skip | 0     |
    +--------------------+-------+
    1 row in set (0.00 sec)

## 5.4.2. `Mroonga_fast_order_limit`

This value is increased when ‘fast ORDER BY LIMIT feature’ is used. You can use this value to check if the feature is working when you enable it.

Here is an example how to check it:

    mysql> SHOW STATUS LIKE 'Mroonga_fast_order_limit';
    +--------------------------+-------+
    | Variable_name            | Value |
    +--------------------------+-------+
    | Mroonga_fast_order_limit | 0     |
    +--------------------------+-------+
    1 row in set (0.00 sec)

## 5.4.3. `Mroonga_condition_push_down`

This value is increased when condition push down is used. You can use this value to check whether condition push down is used or not.

Here is an example how to check it:

    mysql> SHOW STATUS LIKE 'Mroonga_condition_push_down';
    +-----------------------------+-------+
    | Variable_name               | Value |
    +-----------------------------+-------+
    | Mroonga_condition_push_down | 1     |
    +-----------------------------+-------+
    1 row in set (0.00 sec)

## 5.4.4. `Mroonga_n_pooling_contexts`

This value shows the number of pooling contexts for mroonga_command(). These contexts are reused from multiple mroonga_command() calls. So, it’s not increased continually.

Here is an example how to check it:

    mysql> SHOW STATUS LIKE 'Mroonga_n_pooling_contexts';
    +----------------------------+-------+
    | Variable_name              | Value |
    +----------------------------+-------+
    | Mroonga_n_pooling_contexts | 0     |
    +----------------------------+-------+
    1 row in set (0.00 sec)

## 5.4.5. `Mroonga_memory_map_size`

Added in version 12.0.4.

This value shows the currently memory mapped size in bytes.

Here is an example how to check it:

    mysql> SHOW STATUS LIKE 'Mroonga_memory_map_size';
    +-------------------------+----------+
    | Variable_name           | Value    |
    +-------------------------+----------+
    | Mroonga_memory_map_size | 83406848 |
    +-------------------------+----------+
    1 row in set (0.00 sec)