The Sessions page of the CockroachDB Cloud Console provides details of all open sessions in the cluster.
To view this page, select a cluster from the Clusters page, and click SQL Activity in the Monitoring section of the left side navigation. Select the Sessions tab.
Sessions table
Use the Sessions table to see active, idle, and closed sessions. A session is active if it has an open transaction (including implicit transactions, which are individual SQL statements), and idle if it has no open transaction. Active sessions consume hardware resources. A session is closed if it has closed the connection to CockroachDB.
To filter the sessions, click the Filters field.
To filter by application, select Application Name and choose one or more applications.
- Queries from the SQL shell are displayed under the
$ cockroachapp. - If you have not set
application_namein a client connection string, it appears asunset.
- Queries from the SQL shell are displayed under the
To filter by username or session status, select User Name or Session Status and check one or more checkboxes.
To filter by session duration, specify the session time and unit.
Click Columns to select the columns to display in the table.
The following properties are displayed for each session:
| Column | Description |
|---|---|
| Session Start Time (UTC) | The timestamp at which the session started. |
| Session Duration | The amount of time the session has been open. |
| Session Active Duration | The amount of time transactions were executing while the session was open. |
| Status | The status of the session: Active, Idle, or Closed. A session is Active if it has an open explicit or implicit transaction (individual SQL statement) with a statement that is actively running or waiting to acquire a lock. A session is Idle if it has no open transaction. A session is Closed if it has closed the connection to CockroachDB. |
| Most Recent Statement | If more than one statement is executing, the most recent statement. If the session is Idle, the last statement. |
| Statement Start Time (UTC) | The timestamp at which the statement started. |
| Transaction Count | The number of transactions completed in the session. |
| Memory Usage | Amount of memory currently allocated to the session followed by the maximum amount of memory the session has ever been allocated. |
| Client IP Address | The IP address and port of the client that opened the session. |
| User Name | The user that opened the session. |
| Application Name | The application that ran the session. |
| Actions | Options to cancel the active statement and cancel the session. These require the CANCELQUERY system privilege (or the legacy CANCELQUERY role option.
|
To view details of a session, click a Session Start Time (UTC) to display session details.
Session Details
If a session is idle, the Transaction and Most Recent Statement panels will display No Active [Transaction | Statement].
The Cancel statement button ends the SQL statement. The session running this statement will receive an error. The Cancel session button ends the session. The client that holds this session will receive a "connection terminated" event.
Session Details
- Session Start Time shows the timestamp at which the session started.
- Gateway Node shows the node ID and IP address/port of the gateway node handling the client connection.
- Application Name shows the name of the application connected to the session.
- Client IP Address shows the IP address/port of the client that opened the session.
- Memory Usage shows the amount of memory currently allocated to this session, followed by the maximum amount of memory this session has ever allocated.
- User Name displays the name of the user that started the session.
Transaction displays the following information for an open transaction.
- Transaction Start Time shows the timestamp at which the transaction started.
- Number of Statements Executed shows the total number of SQL statements executed by the transaction.
- Number of Retries shows the total number of retries for the transaction.
- Number of Automatic Retries shows the total number of automatic retries run by CockroachDB for the transaction.
- Read Only? shows whether the transaction is read-only.
- AS OF SYSTEM TIME? shows whether the transaction uses
AS OF SYSTEM TIMEto return historical data. - Priority shows the priority for the transaction.
- Memory Usage shows the amount of memory currently allocated to this transaction, followed by the maximum amount of memory this transaction has ever allocated.
Most Recent Statement displays the following information for an active statement.
- The SQL statement.
- Execution Start Time is the timestamp at which the statement was run.
- Distributed Execution? shows whether the statement uses Distributed SQL (DistSQL) optimization.
Most Recent Transaction Fingerprints Executed
A list of the most recent transaction fingerprint IDs, represented in hexadecimal, executed by this session. The fingerprint ID is a link to the Transaction Details page for the transaction. When you click the link, in order to fetch and render the transaction details, the global date range is changed to the session's start and end time.
Closed session cache
Details about closed sessions are stored in memory in a closed session cache. This cache is controlled by the following two cluster settings:
sql.closed_session_cache.capacityis the maximum number of sessions in the cache and defaults to1000. Once this limit is reached, older sessions are deleted from the cache so newer sessions can be included.sql.closed_session_cache.time_to_liveis the maximum time to live, in seconds, and defaults to3600. 60 minutes after a session is closed, it is deleted from the cache.
If the Session Details page displays the message Unable to find session for a closed session, the details may no longer be available because they were removed from this cache according to the previously mentioned cluster settings.
See also
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