Transactions Page

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Note:

On a secure cluster you must be an admin user to access this area of the DB Console. See DB Console security.

The Transactions page offers two views on transactions: Transaction Fingerprints, which represents one or more completed SQL transactions; and Active Executions, which represents individual transaction executions in progress.

Choose a view by selecting the Transaction Fingerprints or Active Executions radio button. The selection is retained when you switch between the Statements and Transactions tabs on the SQL Activity page.

Tip:

In contrast to the Statements page, which displays SQL statement fingerprints, the Transactions page displays transaction fingerprints, which are SQL statement fingerprints grouped by transaction.

Transaction Fingerprints view

The Transaction Fingerprints view helps you:

  • Identify frequently retried transactions.
  • Troubleshoot high-latency transactions or execution failures.
  • View transaction details.

To view this page, click SQL Activity in the left-hand navigation of the DB Console.

Click the Transactions tab. The Transaction Fingerprints radio button is selected and the Transactions table displays.

The following screenshot shows the transaction fingerprint for SELECT city, id FROM vehicles WHERE city = $1 while running the movr workload:

Transaction fingerprint

If you click the transaction fingerprint in the Transactions column, the Transaction Details page displays.

Transaction details

Active Executions view

New in v22.2: The Active Executions view helps you:

  • Understand and tune workload performance, particularly for long-running transactions.

To display this view, click SQL Activity in the left-hand navigation of the DB Console.

The Statements tab is selected. Click the Transactions tab and the Active Executions radio button. The Active Executions table displays.

Note:

Active executions are polled every 10 seconds. Faster-running executions will potentially disappear upon each refresh.

The following screenshot shows the active statement execution for SELECT city, id FROM vehicles WHERE city = 'los angeles' while running the movr workload:

Transaction execution

If you click the execution ID in the Transaction Execution ID column, the Transaction Execution details page displays.

Transaction execution details

Search and filter

By default, the Transactions page shows transactions from all applications and databases running on the cluster.

Search field

To search using the search field:

  1. Type a string over Search Transactions. To search for exact terms in order, wrap the search string in quotes.
  2. Press Enter.

    The list of transactions is filtered by the string.

Time interval

To view transaction fingerprints within a specific time interval, click the time interval selector and pick an interval. The time interval field supports preset time intervals (1 Hour, 6 Hours, 1 Day, etc.) and custom time intervals. To select a custom time interval, click the time interval field and select Custom time interval. In the Start (UTC) and End (UTC) fields select or type a date and time.

Use the arrow keys to cycle through previous and next time intervals. When you select a time interval, the same interval is selected in the Metrics page.

It's possible to select an interval for which no transaction statistics exist. CockroachDB persists transaction statistics up to 1 million rows before the oldest row is deleted. The retention period of statistics is reduced the more active a workload is and the more distinct statement fingerprints there are.

Filter

To filter the transactions:

  1. Click the Filters field.

    • To filter by application, select App and select one or more applications.

      • Queries from the SQL shell are displayed under the $ cockroach app.
      • If you haven't set application_name in a client connection string, it appears as unset.
    • To filter by the nodes on which the transaction ran, click the Node field and select one or more checkboxes.

    • To display only statement fingerprints that take longer than a specified time to run, specify the time and units.

  2. Click Apply.

Movr rides transactions

Transaction statistics

Statistics aggregation is controlled by the sql.stats.aggregation.interval cluster setting, set to 1 hour by default.

Aggregated statistics are flushed from memory to statistics tables in the crdb_internal system catalog every 10 minutes. The flushing interval is controlled by the sql.stats.flush.interval cluster setting.

The default retention period of the statistics tables is based on the number of rows up to 10 million records. When this threshold is reached, the oldest records are deleted. The diagnostics.forced_sql_stat_reset.interval cluster setting controls when persisted statistics are deleted only if the internal cleanup service experiences a failure.

To reset SQL statistics in the DB Console UI and crdb_internal system catalog, click clear SQL stats.

For an example of querying the statistics table, see Example.

Tip:

If you haven't yet executed any transactions in the cluster as a user, this page will be blank.

Transactions table

Click Column selector to select the columns to display in the table.

The Transactions table gives details for each transaction fingerprint in the transaction:

Column Description
Transactions The SQL statement fingerprints that make up the transaction. To view the transaction fingerprint and details, click to open the Transaction Details page.
Execution Count Cumulative number of executions of this transaction within the time interval.

The bar indicates the ratio of runtime success (gray) to retries (red) for the transaction.
Application Name The name specified by the application_name session setting. Click the name to view all statements run by that application.
Rows Processed Average number of rows read and written while executing statements with this fingerprint within the time interval.
Bytes Read Aggregation of all bytes read from disk across all operators for this transaction within the time interval.

The gray bar indicates the mean number of bytes read from disk. The blue bar indicates one standard deviation from the mean.
Transaction Time Average planning and execution time of this transaction within the time interval.

The gray bar indicates the mean latency. The blue bar indicates one standard deviation from the mean.
Contention Time Average time this transaction was in contention with other transactions within the time interval.

The gray bar indicates mean contention time. The blue bar indicates one standard deviation from the mean. Hover over the bar to display exact values.
Max Memory Maximum memory used by this transaction at any time during its execution within the time interval.

The gray bar indicates the average max memory usage. The blue bar indicates one standard deviation from the mean.
Network Amount of data transferred over the network for this transaction within the time interval.

If this value is 0, the transaction was executed on a single node.

The gray bar indicates the mean number of bytes sent over the network. The blue bar indicates one standard deviation from the mean.
Retries Cumulative number of retries of this transaction within the time interval.
Regions/Nodes The region and nodes in which the transaction was executed.

Regions/Nodes are not visible for CockroachDB serverless clusters.
Statements Number of SQL statements in the transaction.
Transaction Fingerprint ID The ID of the transaction fingerprint.
Note:

Significant transactions on your database are likely to have a high execution count or number of rows read.

To view details of a transaction, click a transaction fingerprint in the Transactions column to open the Transaction Details page.

Transaction Details page

The details displayed on the Transaction Details page reflect the time interval selected on the Transactions page.

  • The transaction fingerprint is displayed as a list of the individual SQL statement fingerprints in the transaction.
  • The Mean transaction time: The mean average time it took to execute the transaction within the aggregation interval.
  • The Application name: The name specified by the application_name session setting.
  • Transaction resource usage shows overall statistics about the transaction.
    • Mean rows/bytes read: The mean average number of rows and bytes read from the storage layer during the execution of the transaction within the specified aggregation interval.
    • Bytes read over network: The amount of data transferred over the network for this transaction within the aggregation interval.

      If this value is 0, the statement was executed on a single node.
    • Mean rows written: The mean number of rows written by this transaction.
    • Max memory usage: The maximum memory used by this transaction at any time during its execution within the aggregation interval.
    • Max scratch disk usage: The maximum amount of data spilled to temporary storage on disk while executing this transaction within the aggregation interval.

The Statements page displays the statement fingerprints of all the statements in the transaction. To display the details of a statement fingerprint, click a statement fingerprint.

Active Executions table

Click Column selector to select the columns to display in the table.

The Active Executions table gives details for each transaction fingerprint in the transaction:

Column Description
Transaction Execution ID The execution ID of the transaction.
Most Recent Statement The most recently executed statement in the transaction.
Status The status of the execution: Preparing, Waiting, or Executing.
Start Time (UTC) The timestamp when the execution started.
Elapsed Time The time elapsed since the transaction started.
Time Spent Waiting The amount of time the execution experienced lock contention.
Statements The number of statements in the transaction.
Retries The number of times statements in the transaction were retried.
Application The name specified by the application_name session setting.

To view details of an active transaction execution, click an execution ID in the Transaction Execution ID column to open the Transaction Execution details page.

Transaction execution details page

The transaction execution details page provides the following details on the transaction execution.

  • Start Time (UTC): The timestamp when the execution started.
  • Elapsed Time: The time elapsed since the transaction started.
  • Status: The status of the execution: Preparing, Waiting, or Executing.
  • Priority: The priority of the transaction.
  • Internal Retries: The number of retries of statements in the transaction.
  • Last Retry Reason: The reason for the last statement retry.
  • Number of Statements: The number of statements in the transaction.
  • Application Name: The name specified by the application_name session setting.
  • Most Recent Statement Execution ID: Link to the ID of the most recently executed statement in the transaction.
  • Session ID: Link to the ID of the session in which the transaction is running.

If a transaction execution is waiting, the transaction execution details are followed by Contention Insights and details of the transaction execution on which the blocked transaction execution is waiting.

Movr rides transactions

See also


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