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Update two informtion_schema tables desc #18801

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Oct 16, 2024
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Update two informtion_schema tables desc #18801

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Update processlist and slow_query tables desc
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Update information-schema/information-schema-processlist.md
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Update to use nanoseconds
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Update information-schema/information-schema-slow-query.md
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Update information-schema-processlist.md
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36 changes: 31 additions & 5 deletions information-schema/information-schema-processlist.md
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Expand Up @@ -9,13 +9,33 @@ summary: Learn the `PROCESSLIST` information_schema table.

The `PROCESSLIST` table has additional columns not present in `SHOW PROCESSLIST`:

<CustomContent platform="tidb">

* A `DIGEST` column to show the digest of the SQL statement.
* A `MEM` column to show the memory used by the request that is being processed, in bytes.
* A `DISK` column to show the disk usage in bytes.
* A `TxnStart` column to show the start time of the transaction.
* A `RESOURCE_GROUP` column to show the resource group name.
* A `SESSION_ALIAS` column to show the alias of the current session.
* A `ROWS_AFFECTED` column to show the number of rows currently affected by the statement.
* A `TIDB_CPU` column to show the CPU time (in nanoseconds) consumed by the TiDB server for the statement. This column shows meaningful data only when the [Top SQL](/dashboard/top-sql.md) feature is enabled. Otherwise the value will be `0`.
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* A `TIKV_CPU` column to show the CPU time (in nanoseconds) consumed by the TiKV server for the statement.
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</CustomContent>

<CustomContent platform="tidb-cloud">

* A `DIGEST` column to show the digest of the SQL statement.
* A `MEM` column to show the memory used by the request that is being processed, in bytes.
* A `DISK` column to show the disk usage in bytes.
* A `TxnStart` column to show the start time of the transaction.
* A `RESOURCE_GROUP` column to show the resource group name.
* A `SESSION_ALIAS` column to show the alias of the current session.
* A `ROWS_AFFECTED` column to show the number of rows currently affected by the statement.
* A `TIDB_CPU` column to show the CPU time (in nanoseconds) consumed by the TiDB server for the statement. This column shows meaningful data only when the [Top SQL](https://docs.pingcap.com/tidb/stable/top-sql) feature is enabled. Otherwise the value will be `0`.
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* A `TIKV_CPU` column to show the CPU time (in nanoseconds) consumed by the TiKV server for the statement.
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</CustomContent>

```sql
USE information_schema;
Expand All @@ -41,6 +61,8 @@ DESC processlist;
| RESOURCE_GROUP | varchar(32) | NO | | | |
| SESSION_ALIAS | varchar(64) | NO | | | |
| ROWS_AFFECTED | bigint(21) unsigned | YES | | NULL | |
| TIDB_CPU | bigint(21) | NO | | 0 | |
| TIKV_CPU | bigint(21) | NO | | 0 | |
+----------------+---------------------+------+------+---------+-------+
```

Expand All @@ -65,6 +87,8 @@ SELECT * FROM information_schema.processlist\G
RESOURCE_GROUP: default
SESSION_ALIAS:
ROWS_AFFECTED: 0
TIDB_CPU: 0
TIKV_CPU: 0
```

Fields in the `PROCESSLIST` table are described as follows:
Expand All @@ -84,6 +108,8 @@ Fields in the `PROCESSLIST` table are described as follows:
* `RESOURCE_GROUP`: The resource group name.
* `SESSION_ALIAS`: The alias of the current session.
* `ROWS_AFFECTED`: The number of rows currently affected by the statement.
* `TIDB_CPU`: The CPU time (in nanoseconds) consumed by the TiDB server for the statement. This column shows meaningful data only when the [Top SQL](/dashboard/top-sql.md) feature is enabled. Otherwise the value will be `0`.
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* `TIKV_CPU`: The CPU time (in nanoseconds) consumed by the TiKV server for the statement.
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## CLUSTER_PROCESSLIST

Expand All @@ -94,9 +120,9 @@ SELECT * FROM information_schema.cluster_processlist;
```

```sql
+-----------------+------------+------+-----------------+------+---------+------+------------+------------------------------------------------------+------------------------------------------------------------------+------+------+----------------------------------------+----------------+---------------+---------------+
| INSTANCE | ID | USER | HOST | DB | COMMAND | TIME | STATE | INFO | DIGEST | MEM | DISK | TxnStart | RESOURCE_GROUP | SESSION_ALIAS | ROWS_AFFECTED |
+-----------------+------------+------+-----------------+------+---------+------+------------+------------------------------------------------------+------------------------------------------------------------------+------+------+----------------------------------------+----------------+---------------+---------------+
| 127.0.0.1:10080 | 1268776964 | root | 127.0.0.1:59922 | NULL | Query | 0 | autocommit | SELECT * FROM information_schema.cluster_processlist | b1e38e59fbbc3e2b35546db5c8053040db989a497ac6cd71ff8dd4394395701a | 0 | 0 | 07-29 12:39:24.282(451471727468740609) | default | | 0 |
+-----------------+------------+------+-----------------+------+---------+------+------------+------------------------------------------------------+------------------------------------------------------------------+------+------+----------------------------------------+----------------+---------------+---------------+
+-----------------+------------+------+-----------------+------+---------+------+------------+------------------------------------------------------+------------------------------------------------------------------+------+------+----------------------------------------+----------------+---------------+---------------+----------+----------+
| INSTANCE | ID | USER | HOST | DB | COMMAND | TIME | STATE | INFO | DIGEST | MEM | DISK | TxnStart | RESOURCE_GROUP | SESSION_ALIAS | ROWS_AFFECTED | TIDB_CPU | TIKV_CPU |
+-----------------+------------+------+-----------------+------+---------+------+------------+------------------------------------------------------+------------------------------------------------------------------+------+------+----------------------------------------+----------------+---------------+---------------+----------+----------+
| 127.0.0.1:10080 | 1268776964 | root | 127.0.0.1:59922 | NULL | Query | 0 | autocommit | SELECT * FROM information_schema.cluster_processlist | b1e38e59fbbc3e2b35546db5c8053040db989a497ac6cd71ff8dd4394395701a | 0 | 0 | 07-29 12:39:24.282(451471727468740609) | default | | 0 | 0 | 0 |
+-----------------+------------+------+-----------------+------+---------+------+------------+------------------------------------------------------+------------------------------------------------------------------+------+------+----------------------------------------+----------------+---------------+---------------+----------+----------+
```
4 changes: 4 additions & 0 deletions information-schema/information-schema-slow-query.md
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Expand Up @@ -112,6 +112,8 @@ The output is as follows:
| Request_unit_read | double | YES | | NULL | |
| Request_unit_write | double | YES | | NULL | |
| Time_queued_by_rc | double | YES | | NULL | |
| Tidb_cpu_time | double | YES | | NULL | |
| Tikv_cpu_time | double | YES | | NULL | |
| Plan | longtext | YES | | NULL | |
| Plan_digest | varchar(128) | YES | | NULL | |
| Binary_plan | longtext | YES | | NULL | |
Expand Down Expand Up @@ -222,6 +224,8 @@ The output is as follows:
| Request_unit_read | double | YES | | NULL | |
| Request_unit_write | double | YES | | NULL | |
| Time_queued_by_rc | double | YES | | NULL | |
| Tidb_cpu_time | double | YES | | NULL | |
| Tikv_cpu_time | double | YES | | NULL | |
| Plan | longtext | YES | | NULL | |
| Plan_digest | varchar(128) | YES | | NULL | |
| Binary_plan | longtext | YES | | NULL | |
Expand Down
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