diff --git a/docs/en/engines/table-engines/index.md b/docs/en/engines/table-engines/index.md index 5e81eacc937..20c7c511aa9 100644 --- a/docs/en/engines/table-engines/index.md +++ b/docs/en/engines/table-engines/index.md @@ -61,6 +61,7 @@ Engines in the family: - [RabbitMQ](../../engines/table-engines/integrations/rabbitmq.md) - [PostgreSQL](../../engines/table-engines/integrations/postgresql.md) - [S3Queue](../../engines/table-engines/integrations/s3queue.md) +- [TimeSeries](../../engines/table-engines/integrations/time-series.md) ### Special Engines {#special-engines} diff --git a/docs/en/engines/table-engines/integrations/time-series.md b/docs/en/engines/table-engines/integrations/time-series.md new file mode 100644 index 00000000000..4830fd61d27 --- /dev/null +++ b/docs/en/engines/table-engines/integrations/time-series.md @@ -0,0 +1,295 @@ +--- +slug: /en/engines/table-engines/special/time_series +sidebar_position: 60 +sidebar_label: TimeSeries +--- + +# TimeSeries Engine [Experimental] + +A table engine storing time series, i.e. a set of values associated with timestamps and tags (or labels): + +``` +metric_name1[tag1=value1, tag2=value2, ...] = {timestamp1: value1, timestamp2: value2, ...} +metric_name2[...] = ... +``` + +:::info +This is an experimental feature that may change in backwards-incompatible ways in the future releases. +Enable usage of the TimeSeries table engine +with [allow_experimental_time_series_table](../../../operations/settings/settings.md#allow-experimental-time-series-table) setting. +Input the command `set allow_experimental_time_series_table = 1`. +::: + +## Syntax {#syntax} + +``` sql +CREATE TABLE name [(columns)] ENGINE=TimeSeries +[SETTINGS var1=value1, ...] +[DATA db.data_table_name | DATA ENGINE data_table_engine(arguments)] +[TAGS db.tags_table_name | TAGS ENGINE tags_table_engine(arguments)] +[METRICS db.metrics_table_name | METRICS ENGINE metrics_table_engine(arguments)] +``` + +## Usage {#usage} + +It's easier to start with everything set by default (it's allowed to create a `TimeSeries` table without specifying a list of columns): + +``` sql +CREATE TABLE my_table ENGINE=TimeSeries +``` + +Then this table can be used with the following protocols (a port must be assigned in the server configuration): +- [prometheus remote-write](../../../interfaces/prometheus.md#remote-write) +- [prometheus remote-read](../../../interfaces/prometheus.md#remote-read) + +## Target tables {#target-tables} + +A `TimeSeries` table doesn't have its own data, everything is stored in its target tables. +This is similar to how a [materialized view](../../../sql-reference/statements/create/view#materialized-view) works, +with the difference that a materialized view has one target table +whereas a `TimeSeries` table has three target tables named [data]{#data-table}, [tags]{#tags-table], and [metrics]{#metrics-table}. + +The target tables can be either specified explicitly in the `CREATE TABLE` query +or the `TimeSeries` table engine can generate inner target tables automatically. + +The target tables are the following: +1. The _data_ table {#data-table} contains time series associated with some identifier. +The _data_ table must have columns: + +| Name | Mandatory? | Default type | Possible types | Description | +|---|---|---|---|---| +| `id` | [x] | `UUID` | any | Identifies a combination of a metric names and tags | +| `timestamp` | [x] | `DateTime64(3)` | `DateTime64(X)` | A time point | +| `value` | [x] | `Float64` | `Float32` or `Float64` | A value associated with the `timestamp` | + +2. The _tags_ table {#tags-table} contains identifiers calculated for each combination of a metric name and tags. +The _tags_ table must have columns: + +| Name | Mandatory? | Default type | Possible types | Description | +|---|---|---|---|---| +| `id` | [x] | `UUID` | any (must match the type of `id` in the [data]{#data-table} table) | An `id` identifies a combination of a metric name and tags. The DEFAULT expression specifies how to calculate such an identifier | +| `metric_name` | [x] | `LowCardinality(String)` | `String` or `LowCardinality(String)` | The name of a metric | +| `` | [ ] | `String` | `String` or `LowCardinality(String)` or `LowCardinality(Nullable(String))` | The value of a specific tag, the tag's name and the name of a corresponding column are specified in the [tags_to_columns](#settings) setting | +| `tags` | [x] | `Map(LowCardinality(String), String)` | `Map(String, String)` or `Map(LowCardinality(String), String)` or `Map(LowCardinality(String), LowCardinality(String))` | Map of tags excluding the tag `__name__` containing the name of a metric and excluding tags with names enumerated in the [tags_to_columns](#settings) setting | +| `all_tags` | [ ] | `Map(String, String)` | `Map(String, String)` or `Map(LowCardinality(String), String)` or `Map(LowCardinality(String), LowCardinality(String))` | Ephemeral column, each row is a map of all the tags excluding only the tag `__name__` containing the name of a metric. The only purpose of that column is to be used while calculating `id` | +| `min_time` | [ ] | `Nullable(DateTime64(3))` | `DateTime64(X)` or `Nullable(DateTime64(X))` | Minimum timestamp of time series with that `id`. The column is created if [store_min_time_and_max_time](#settings) is `true` | +| `max_time` | [ ] | `Nullable(DateTime64(3))` | `DateTime64(X)` or `Nullable(DateTime64(X))` | Maximum timestamp of time series with that `id`. The column is created if [store_min_time_and_max_time](#settings) is `true` | + +3. The _metrics_ table {#metrics-table} contains some information about metrics been collected, the types of those metrics and their descriptions. +The _metrics_ table must have columns: + +| Name | Mandatory? | Default type | Possible types | Description | +|---|---|---|---|---| +| `metric_family_name` | [x] | `String` | `String` or `LowCardinality(String)` | The name of a metric family | +| `type` | [x] | `String` | `String` or `LowCardinality(String)` | The type of a metric family, one of "counter", "gauge", "summary", "stateset", "histogram", "gaugehistogram" | +| `unit` | [x] | `String` | `String` or `LowCardinality(String)` | The unit used in a metric | +| `help` | [x] | `String` | `String` or `LowCardinality(String)` | The description of a metric | + +Any row inserted into a `TimeSeries` table will be in fact stored in those three target tables. +A `TimeSeries` table contains all those columns from the [data]{#data-table}, [tags]{#tags-table}, [metrics]{#metrics-table} tables. + +## Creation {#creation} + +There are multiple ways to create a table with the `TimeSeries` table engine. +The simplest statement + +``` sql +CREATE TABLE my_table ENGINE=TimeSeries +``` + +will actually create the following table (you can see that by executing `SHOW CREATE TABLE my_table`): + +``` sql +CREATE TABLE my_table +( + `id` UUID DEFAULT reinterpretAsUUID(sipHash128(metric_name, all_tags)), + `timestamp` DateTime64(3), + `value` Float64, + `metric_name` LowCardinality(String), + `tags` Map(LowCardinality(String), String), + `all_tags` Map(String, String), + `min_time` Nullable(DateTime64(3)), + `max_time` Nullable(DateTime64(3)), + `metric_family_name` String, + `type` String, + `unit` String, + `help` String +) +ENGINE = TimeSeries +DATA ENGINE = MergeTree ORDER BY (id, timestamp) +DATA INNER UUID '01234567-89ab-cdef-0123-456789abcdef' +TAGS ENGINE = AggregatingMergeTree PRIMARY KEY metric_name ORDER BY (metric_name, id) +TAGS INNER UUID '01234567-89ab-cdef-0123-456789abcdef' +METRICS ENGINE = ReplacingMergeTree ORDER BY metric_family_name +METRICS INNER UUID '01234567-89ab-cdef-0123-456789abcdef' +``` + +So the columns were generated automatically and also there are three inner UUIDs in this statement - +one per each inner target table that was created. +(Inner UUIDs are not shown normally until setting +[show_table_uuid_in_table_create_query_if_not_nil](../../../operations/settings/settings#show_table_uuid_in_table_create_query_if_not_nil) +is set.) + +Inner target tables have names like `.inner_id.data.xxxxxxxx-xxxx-xxxx-xxxx-xxxxxxxxxxxx`, +`.inner_id.tags.xxxxxxxx-xxxx-xxxx-xxxx-xxxxxxxxxxxx`, `.inner_id.metrics.xxxxxxxx-xxxx-xxxx-xxxx-xxxxxxxxxxxx` +and each target table has columns which is a subset of the columns of the main `TimeSeries` table: + +``` sql +CREATE TABLE default.`.inner_id.data.xxxxxxxx-xxxx-xxxx-xxxx-xxxxxxxxxxxx` +( + `id` UUID, + `timestamp` DateTime64(3), + `value` Float64 +) +ENGINE = MergeTree +ORDER BY (id, timestamp) +``` + +``` sql +CREATE TABLE default.`.inner_id.tags.xxxxxxxx-xxxx-xxxx-xxxx-xxxxxxxxxxxx` +( + `id` UUID DEFAULT reinterpretAsUUID(sipHash128(metric_name, all_tags)), + `metric_name` LowCardinality(String), + `tags` Map(LowCardinality(String), String), + `all_tags` Map(String, String) EPHEMERAL, + `min_time` SimpleAggregateFunction(min, Nullable(DateTime64(3))), + `max_time` SimpleAggregateFunction(max, Nullable(DateTime64(3))) +) +ENGINE = AggregatingMergeTree +PRIMARY KEY metric_name +ORDER BY (metric_name, id) +``` + +``` sql +CREATE TABLE default.`.inner_id.metrics.xxxxxxxx-xxxx-xxxx-xxxx-xxxxxxxxxxxx` +( + `metric_family_name` String, + `type` String, + `unit` String, + `help` String +) +ENGINE = ReplacingMergeTree +ORDER BY metric_family_name +``` + +## Adjusting types of columns {#adjusting-column-types} + +You can adjust the types of almost any column of the inner target tables by specifying them explicitly +while defining the main table. For example, + +``` sql +CREATE TABLE my_table +( + timestamp DateTime64(6) +) ENGINE=TimeSeries +``` + +will make the inner [data]{#data-table} table store timestamp in microseconds instead of milliseconds: + +``` sql +CREATE TABLE default.`.inner_id.data.xxxxxxxx-xxxx-xxxx-xxxx-xxxxxxxxxxxx` +( + `id` UUID, + `timestamp` DateTime64(6), + `value` Float64 +) +ENGINE = MergeTree +ORDER BY (id, timestamp) +``` + +## The `id` column {#id-column} + +The `id` column contains identifiers, every identifier is calculated for a combination of a metric name and tags. +The DEFAULT expression for the `id` column is an expression which will be used to calculate such identifiers. +Both the type of the `id` column and that expression can be adjusted by specifying them explicitly: + +``` sql +CREATE TABLE my_table +( + id UInt64 DEFAULT sipHash64(metric_name, all_tags) +) ENGINE=TimeSeries +``` + +## The `tags` and `all_tags` columns {#tags-and-all-tags} + +There are two columns containing maps of tags - `tags` and `all_tags`. In this example they mean the same, however they can be different +if setting `tags_to_columns` is used. This setting allows to specify that a specific tag should be stored in a separate column instead of storing +in a map inside the `tags` column: + +``` sql +CREATE TABLE my_table ENGINE=TimeSeries SETTINGS = {'instance': 'instance', 'job': 'job'} +``` + +This statement will add columns +``` + `instance` String, + `job` String +``` +to the definition of both `my_table` and its inner [tags]{#tags-table} target table. In this case the `tags` column will not contain tags `instance` and `job`, +but the `all_tags` column will contain them. The `all_tags` column is ephemeral and its only purpose to be used in the DEFAULT expression +for the `id` column. + +The types of columns can be adjusted by specifying them explicitly: + +``` sql +CREATE TABLE my_table (instance LowCardinality(String), job LowCardinality(Nullable(String))) +ENGINE=TimeSeries SETTINGS = {'instance': 'instance', 'job': 'job'} +``` + +## Table engines of inner target tables {#inner-table-engines} + +By default inner target tables use the following table engines: +- the [data]{#data-table} table uses [MergeTree](../mergetree-family/mergetree); +- the [tags]{#tags-table} table uses [AggregatingMergeTree](../mergetree-family/aggregatingmergetree) because the same data is often inserted multiple times to this table so we need a way +to remove duplicates, and also because it's required to do aggregation for columns `min_time` and `max_time`; +- the [metrics]{#metrics-table} table uses [ReplacingMergeTree](../mergetree-family/replacingmergetree) because the same data is often inserted multiple times to this table so we need a way +to remove duplicates. + +Other table engines also can be used for inner target tables if it's specified so: + +``` sql +CREATE TABLE my_table ENGINE=TimeSeries +DATA ENGINE=ReplicatedMergeTree +TAGS ENGINE=ReplicatedAggregatingMergeTree +METRICS ENGINE=ReplicatedReplacingMergeTree +``` + +## External target tables {#external-target-tables} + +It's possible to make a `TimeSeries` table use a manually created table: + +``` sql +CREATE TABLE data_for_my_table +( + `id` UUID, + `timestamp` DateTime64(3), + `value` Float64 +) +ENGINE = MergeTree +ORDER BY (id, timestamp); + +CREATE TABLE tags_for_my_table ... + +CREATE TABLE metrics_for_my_table ... + +CREATE TABLE my_table ENGINE=TimeSeries DATA data_for_my_table TAGS tags_for_my_table METRICS metrics_for_my_table; +``` + +## Settings {#settings} + +Here is a list of settings which can be specified while defining a `TimeSeries` table: + +| Name | Type | Default | Description | +|---|---|---|---| +| `tags_to_columns` | Map | {} | Map specifying which tags should be put to separate columns in the [tags]{#tags-table} table. Syntax: `{'tag1': 'column1', 'tag2' : column2, ...}` | +| `use_all_tags_column_to_generate_id` | Bool | true | When generating an expression to calculate an identifier of a time series, this flag enables using the `all_tags` column in that calculation | +| `store_min_time_and_max_time` | Bool | true | If set to true then the table will store `min_time` and `max_time` for each time series | +| `aggregate_min_time_and_max_time` | Bool | true | When creating an inner target `tags` table, this flag enables using `SimpleAggregateFunction(min, Nullable(DateTime64(3)))` instead of just `Nullable(DateTime64(3))` as the type of the `min_time` column, and the same for the `max_time` column | +| `filter_by_min_time_and_max_time` | Bool | true | If set to true then the table will use the `min_time` and `max_time` columns for filtering time series | + +# Functions {#functions} + +Here is a list of functions supporting a `TimeSeries` table as an argument: +- [timeSeriesData](../../../sql-reference/table-functions/timeSeriesData.md) +- [timeSeriesTags](../../../sql-reference/table-functions/timeSeriesTags.md) +- [timeSeriesMetrics](../../../sql-reference/table-functions/timeSeriesMetrics.md) diff --git a/docs/en/interfaces/prometheus.md b/docs/en/interfaces/prometheus.md new file mode 100644 index 00000000000..bf541901b34 --- /dev/null +++ b/docs/en/interfaces/prometheus.md @@ -0,0 +1,160 @@ +--- +slug: /en/interfaces/prometheus +sidebar_position: 19 +sidebar_label: Prometheus protocols +--- + +# Prometheus protocols + +## Exposing metrics {#expose} + +:::note +ClickHouse Cloud does not currently support connecting to Prometheus. To be notified when this feature is supported, please contact support@clickhouse.com. +::: + +ClickHouse can expose its own metrics for scraping from Prometheus: + +```xml + + 9363 + /metrics + true + true + true + true + + +Section `` can be used to make more extended handlers. +This section is similar to [](/en/interfaces/http) but works for prometheus protocols: + +```xml + + 9363 + + + /metrics + + expose_metrics + true + true + true + true + + + + +``` + +Settings: + +| Name | Default | Description | +|---|---|---|---| +| `port` | none | Port for serving the exposing metrics protocol. | +| `endpoint` | `/metrics` | HTTP endpoint for scraping metrics by prometheus server. Starts with `/`. Should not be used with the `` section. | +| `url` / `headers` / `method` | none | Filters used to find a matching handler for a request. Similar to the fields with the same names in the [](/en/interfaces/http) section. | +| `metrics` | true | Expose metrics from the [system.metrics](/en/operations/system-tables/metrics) table. | +| `asynchronous_metrics` | true | Expose current metrics values from the [system.asynchronous_metrics](/en/operations/system-tables/asynchronous_metrics) table. | +| `events` | true | Expose metrics from the [system.events](/en/operations/system-tables/events) table. | +| `errors` | true | Expose the number of errors by error codes occurred since the last server restart. This information could be obtained from the [system.errors](/en/operations/system-tables/errors) as well. | + +Check (replace `127.0.0.1` with the IP addr or hostname of your ClickHouse server): +```bash +curl 127.0.0.1:9363/metrics +``` + +## Remote-write protocol {#remote-write} + +ClickHouse supports the [remote-write](https://prometheus.io/docs/specs/remote_write_spec/) protocol. +Data are received by this protocol and written to a [TimeSeries](/en/engines/table-engines/special/time_series) table +(which should be created beforehand). + +```xml + + 9363 + + + /write + + remote_writedb_name + time_series_table
+ + + + +``` + +Settings: + +| Name | Default | Description | +|---|---|---|---| +| `port` | none | Port for serving the `remote-write` protocol. | +| `url` / `headers` / `method` | none | Filters used to find a matching handler for a request. Similar to the fields with the same names in the [](/en/interfaces/http) section. | +| `table` | none | The name of a [TimeSeries](/en/engines/table-engines/special/time_series) table to write data received by the `remote-write` protocol. This name can optionally contain the name of a database too. | +| `database` | none | The name of a database where the table specified in the `table` setting is located if it's not specified in the `table` setting. | + +## Remote-read protocol {#remote-read} + +ClickHouse supports the [remote-read](https://prometheus.io/docs/prometheus/latest/querying/remote_read_api/) protocol. +Data are read from a [TimeSeries](/en/engines/table-engines/special/time_series) table and sent via this protocol. + +```xml + + 9363 + + + /read + + remote_readdb_name + time_series_table
+ + + + +``` + +Settings: + +| Name | Default | Description | +|---|---|---|---| +| `port` | none | Port for serving the `remote-read` protocol. | +| `url` / `headers` / `method` | none | Filters used to find a matching handler for a request. Similar to the fields with the same names in the [](/en/interfaces/http) section. | +| `table` | none | The name of a [TimeSeries](/en/engines/table-engines/special/time_series) table to read data to send by the `remote-read` protocol. This name can optionally contain the name of a database too. | +| `database` | none | The name of a database where the table specified in the `table` setting is located if it's not specified in the `table` setting. | + +## Configuration for multiple protocols {#multiple-protocols} + +Multiple protocols can be specified together in one place: + +```xml + + 9363 + + + /metrics + + expose_metrics + true + true + true + true + + + + /write + + remote_writedb_name.time_series_table + + + + /read + + remote_readdb_name.time_series_table + + + + +``` diff --git a/docs/en/operations/server-configuration-parameters/settings.md b/docs/en/operations/server-configuration-parameters/settings.md index a1e3c292b04..68f61650e00 100644 --- a/docs/en/operations/server-configuration-parameters/settings.md +++ b/docs/en/operations/server-configuration-parameters/settings.md @@ -2112,48 +2112,6 @@ The trailing slash is mandatory. /var/lib/clickhouse/ ``` -## Prometheus {#prometheus} - -:::note -ClickHouse Cloud does not currently support connecting to Prometheus. To be notified when this feature is supported, please contact support@clickhouse.com. -::: - -Exposing metrics data for scraping from [Prometheus](https://prometheus.io). - -Settings: - -- `endpoint` – HTTP endpoint for scraping metrics by prometheus server. Start from ‘/’. -- `port` – Port for `endpoint`. -- `metrics` – Expose metrics from the [system.metrics](../../operations/system-tables/metrics.md#system_tables-metrics) table. -- `events` – Expose metrics from the [system.events](../../operations/system-tables/events.md#system_tables-events) table. -- `asynchronous_metrics` – Expose current metrics values from the [system.asynchronous_metrics](../../operations/system-tables/asynchronous_metrics.md#system_tables-asynchronous_metrics) table. -- `errors` - Expose the number of errors by error codes occurred since the last server restart. This information could be obtained from the [system.errors](../../operations/system-tables/asynchronous_metrics.md#system_tables-errors) as well. - -**Example** - -``` xml - - 0.0.0.0 - 8123 - 9000 - - - /metrics - 9363 - true - true - true - true - - - -``` - -Check (replace `127.0.0.1` with the IP addr or hostname of your ClickHouse server): -```bash -curl 127.0.0.1:9363/metrics -``` - ## query_log {#query-log} Setting for logging queries received with the [log_queries=1](../../operations/settings/settings.md) setting. diff --git a/docs/en/operations/settings/settings.md b/docs/en/operations/settings/settings.md index 968481062e9..e432f4e038f 100644 --- a/docs/en/operations/settings/settings.md +++ b/docs/en/operations/settings/settings.md @@ -5626,3 +5626,14 @@ Default value: `False` Disable all insert and mutations (alter table update / alter table delete / alter table drop partition). Set to true, can make this node focus on reading queries. Default value: `false`. + +## allow_experimental_time_series_table {#allow-experimental-time-series-table} + +Allows creation of tables with the [TimeSeries](../../engines/table-engines/integrations/time-series.md) table engine. + +Possible values: + +- 0 — the [TimeSeries](../../engines/table-engines/integrations/time-series.md) table engine is disabled. +- 1 — the [TimeSeries](../../engines/table-engines/integrations/time-series.md) table engine is enabled. + +Default value: `0`. diff --git a/docs/en/sql-reference/table-functions/timeSeriesData.md b/docs/en/sql-reference/table-functions/timeSeriesData.md new file mode 100644 index 00000000000..aa7a9d30c2a --- /dev/null +++ b/docs/en/sql-reference/table-functions/timeSeriesData.md @@ -0,0 +1,28 @@ +--- +slug: /en/sql-reference/table-functions/timeSeriesData +sidebar_position: 145 +sidebar_label: timeSeriesData +--- + +# timeSeriesData + +`timeSeriesData(db_name.time_series_table)` - Returns the [data](../../engines/table-engines/integrations/time-series.md#data-table) table +used by table `db_name.time_series_table` which table engine is [TimeSeries](../../engines/table-engines/integrations/time-series.md): + +``` sql +CREATE TABLE db_name.time_series_table ENGINE=TimeSeries DATA data_table +``` + +The function also works if the _data_ table is inner: + +``` sql +CREATE TABLE db_name.time_series_table ENGINE=TimeSeries DATA INNER UUID '01234567-89ab-cdef-0123-456789abcdef' +``` + +The following queries are equivalent: + +``` sql +SELECT * FROM timeSeriesData(db_name.time_series_table); +SELECT * FROM timeSeriesData('db_name.time_series_table'); +SELECT * FROM timeSeriesData('db_name', 'time_series_table'); +``` diff --git a/docs/en/sql-reference/table-functions/timeSeriesMetrics.md b/docs/en/sql-reference/table-functions/timeSeriesMetrics.md new file mode 100644 index 00000000000..913f1185bca --- /dev/null +++ b/docs/en/sql-reference/table-functions/timeSeriesMetrics.md @@ -0,0 +1,28 @@ +--- +slug: /en/sql-reference/table-functions/timeSeriesMetrics +sidebar_position: 145 +sidebar_label: timeSeriesMetrics +--- + +# timeSeriesMetrics + +`timeSeriesMetrics(db_name.time_series_table)` - Returns the [metrics](../../engines/table-engines/integrations/time-series.md#metrics-table) table +used by table `db_name.time_series_table` which table engine is [TimeSeries](../../engines/table-engines/integrations/time-series.md): + +``` sql +CREATE TABLE db_name.time_series_table ENGINE=TimeSeries METRICS metrics_table +``` + +The function also works if the _metrics_ table is inner: + +``` sql +CREATE TABLE db_name.time_series_table ENGINE=TimeSeries METRICS INNER UUID '01234567-89ab-cdef-0123-456789abcdef' +``` + +The following queries are equivalent: + +``` sql +SELECT * FROM timeSeriesMetrics(db_name.time_series_table); +SELECT * FROM timeSeriesMetrics('db_name.time_series_table'); +SELECT * FROM timeSeriesMetrics('db_name', 'time_series_table'); +``` diff --git a/docs/en/sql-reference/table-functions/timeSeriesTags.md b/docs/en/sql-reference/table-functions/timeSeriesTags.md new file mode 100644 index 00000000000..663a7dc6ac8 --- /dev/null +++ b/docs/en/sql-reference/table-functions/timeSeriesTags.md @@ -0,0 +1,28 @@ +--- +slug: /en/sql-reference/table-functions/timeSeriesTags +sidebar_position: 145 +sidebar_label: timeSeriesTags +--- + +# timeSeriesTags + +`timeSeriesTags(db_name.time_series_table)` - Returns the [tags](../../engines/table-engines/integrations/time-series.md#tags-table) table +used by table `db_name.time_series_table` which table engine is [TimeSeries](../../engines/table-engines/integrations/time-series.md): + +``` sql +CREATE TABLE db_name.time_series_table ENGINE=TimeSeries TAGS tags_table +``` + +The function also works if the _tags_ table is inner: + +``` sql +CREATE TABLE db_name.time_series_table ENGINE=TimeSeries TAGS INNER UUID '01234567-89ab-cdef-0123-456789abcdef' +``` + +The following queries are equivalent: + +``` sql +SELECT * FROM timeSeriesTags(db_name.time_series_table); +SELECT * FROM timeSeriesTags('db_name.time_series_table'); +SELECT * FROM timeSeriesTags('db_name', 'time_series_table'); +``` diff --git a/utils/check-style/aspell-ignore/en/aspell-dict.txt b/utils/check-style/aspell-ignore/en/aspell-dict.txt index 37094a1a088..469c0a5fc5f 100644 --- a/utils/check-style/aspell-ignore/en/aspell-dict.txt +++ b/utils/check-style/aspell-ignore/en/aspell-dict.txt @@ -1674,6 +1674,7 @@ fuzzQuery fuzzer fuzzers gRPC +gaugehistogram gccMurmurHash gcem generateRandom @@ -2558,6 +2559,7 @@ startsWithUTF startswith statbox stateful +stateset stddev stddevPop stddevPopStable @@ -2689,6 +2691,10 @@ themself threadpool throwIf timeDiff +TimeSeries +timeSeriesData +timeSeriesMetrics +timeSeriesTags timeSlot timeSlots timeZone