--- slug: /en/operations/system-tables/settings_changes --- # settings_changes Contains information about setting changes in previous ClickHouse versions. Columns: - `type` ([String](../../sql-reference/data-types/string.md)) - The group of settings (Core, MergeTree...) - `version` ([String](../../sql-reference/data-types/string.md)) — The ClickHouse version in which settings were changed - `changes` ([Array](../../sql-reference/data-types/array.md) of [Tuple](../../sql-reference/data-types/tuple.md)) — A description of the setting changes: (setting name, previous value, new value, reason for the change) **Example** ``` sql SELECT * FROM system.settings_changes WHERE version = '23.5' FORMAT Vertical ``` ``` text Row 1: ────── type: Core version: 23.5 changes: [('input_format_parquet_preserve_order','1','0','Allow Parquet reader to reorder rows for better parallelism.'),('parallelize_output_from_storages','0','1','Allow parallelism when executing queries that read from file/url/s3/etc. This may reorder rows.'),('use_with_fill_by_sorting_prefix','0','1','Columns preceding WITH FILL columns in ORDER BY clause form sorting prefix. Rows with different values in sorting prefix are filled independently'),('output_format_parquet_compliant_nested_types','0','1','Change an internal field name in output Parquet file schema.')] ``` **See also** - [Settings](../../operations/settings/index.md#session-settings-intro) - [system.settings](settings.md)