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SAVEPOINT

  • Capella Operational
  • reference
    +
    The SAVEPOINT statement enables you to set a savepoint within a transaction.

    Purpose

    The SAVEPOINT statement enables you to set a savepoint within an ACID transaction. For more information, see SQL++ Support for Couchbase Transactions.

    You may only use this statement within a transaction.

    Syntax

    savepoint ::= 'SAVEPOINT' savepointname
    Syntax diagram: see source code listing
    savepointname

    An identifier specifying a name for the savepoint.

    If a savepoint with the same name already exists, the existing savepoint is replaced.

    Example

    If you want to try this example, first see Preparation to set up your environment.

    Example 1. Set savepoints
    Transaction
    -- Start the transaction
BEGIN TRANSACTION;

-- Specify transaction settings
SET TRANSACTION ISOLATION LEVEL READ COMMITTED;

-- Create a booking document
UPSERT INTO bookings
VALUES("bf7ad6fa-bdb9-4099-a840-196e47179f03", {
  "date": "07/24/2021",
  "flight": "WN533",
  "flighttime": 7713,
  "price": 964.13,
  "route": "63986"
});

-- Set a savepoint
SAVEPOINT s1;

-- Update the booking document to include a user
UPDATE bookings AS b
USE KEYS "bf7ad6fa-bdb9-4099-a840-196e47179f03"
SET b.`user` = "0";

-- Check the content of the booking and user
SELECT b.*, u.name
FROM bookings b
USE KEYS "bf7ad6fa-bdb9-4099-a840-196e47179f03"
JOIN users u
ON KEYS b.`user`;

-- Set a second savepoint
SAVEPOINT s2;

-- Update the booking documents to change the user
UPDATE bookings AS b
USE KEYS "bf7ad6fa-bdb9-4099-a840-196e47179f03"
SET b.`user` = "1";

-- Check the content of the booking and user
SELECT b.*, u.name
FROM bookings b
USE KEYS "bf7ad6fa-bdb9-4099-a840-196e47179f03"
JOIN users u
ON KEYS b.`user`;

-- Roll back the transaction to the second savepoint
ROLLBACK TRANSACTION TO SAVEPOINT s2;

-- Check the content of the booking and user again
SELECT b.*, u.name
FROM bookings b
USE KEYS "bf7ad6fa-bdb9-4099-a840-196e47179f03"
JOIN users u
ON KEYS b.`user`;

-- Commit the transaction
COMMIT TRANSACTION;
    Results
    cbq> -- Start the transaction
cbq> BEGIN TRANSACTION;
{
    "requestID": "da8567c3-d2d3-4d32-807b-c7e898f66611",
    "signature": "json",
    "results": [
    {
        "nodeUUID": "9803422b02fd9e6c9e7156b8ddb2d840",
        "txid": "fab2bd20-322e-4ed0-bc4e-035db995f349" (1)
    }
    ],
    "status": "success",
    "metrics": {
        "elapsedTime": "6.8305ms",
        "executionTime": "6.603708ms",
        "resultCount": 1,
        "resultSize": 118,
        "serviceLoad": 3,
        "transactionElapsedTime": "6.046625ms",
        "transactionRemainingTime": "1m59.993945125s"
    }
}
cbq> 
cbq> -- Specify transaction settings
cbq> SET TRANSACTION ISOLATION LEVEL READ COMMITTED;
{
    "requestID": "6ac24c82-76db-45f5-9f44-5a2cf15e1e34",
    "signature": "json",
    "results": [
    ],
    "status": "success",
    "metrics": {
        "elapsedTime": "231.666µs",
        "executionTime": "161.333µs",
        "resultCount": 0,
        "resultSize": 0,
        "serviceLoad": 0,
        "transactionElapsedTime": "9.523333ms",
        "transactionRemainingTime": "1m59.990474875s"
    }
}
cbq> 
cbq> -- Create a booking document
cbq> UPSERT INTO bookings
   > VALUES("bf7ad6fa-bdb9-4099-a840-196e47179f03", {
   >   "date": "07/24/2021",
   >   "flight": "WN533",
   >   "flighttime": 7713,
   >   "price": 964.13,
   >   "route": "63986"
   > });
{
    "requestID": "d34e0dba-b15c-407e-b2e5-082def71a6a9",
    "signature": null,
    "results": [
    ],
    "status": "success",
    "metrics": {
        "elapsedTime": "9.695625ms",
        "executionTime": "9.6555ms",
        "resultCount": 0,
        "resultSize": 0,
        "serviceLoad": 0,
        "mutationCount": 1,
        "transactionElapsedTime": "21.353333ms",
        "transactionRemainingTime": "1m59.97864225s"
    }
}
cbq> 
cbq> -- Set a savepoint
cbq> SAVEPOINT s1;
{
    "requestID": "1be8ab5b-c00a-4f1f-9891-55d17574d8ce",
    "signature": "json",
    "results": [
    ],
    "status": "success",
    "metrics": {
        "elapsedTime": "200.25µs",
        "executionTime": "134.209µs",
        "resultCount": 0,
        "resultSize": 0,
        "serviceLoad": 0,
        "transactionElapsedTime": "22.689167ms",
        "transactionRemainingTime": "1m59.977309042s"
    }
}
cbq> 
cbq> -- Update the booking document to include a user
cbq> UPDATE bookings AS b
   > USE KEYS "bf7ad6fa-bdb9-4099-a840-196e47179f03"
   > SET b.`user` = "0";
{
    "requestID": "e9476c21-113f-465c-ae40-d76931ba5aef",
    "signature": null,
    "results": [
    ],
    "status": "success",
    "metrics": {
        "elapsedTime": "1.35775ms",
        "executionTime": "1.217167ms",
        "resultCount": 0,
        "resultSize": 0,
        "serviceLoad": 0,
        "mutationCount": 1,
        "transactionElapsedTime": "25.2525ms",
        "transactionRemainingTime": "1m59.974745208s"
    }
}
cbq> 
cbq> -- Check the content of the booking and user
cbq> SELECT b.*, u.name
   > FROM bookings b
   > USE KEYS "bf7ad6fa-bdb9-4099-a840-196e47179f03"
   > JOIN users u
   > ON KEYS b.`user`;
{
    "requestID": "67974697-2614-4b8e-9c47-668bc183e1ea",
    "signature": {
        "*": "*",
        "name": "json"
    },
    "results": [
    {
        "date": "07/24/2021",
        "flight": "WN533",
        "flighttime": 7713,
        "price": 964.13,
        "route": "63986",
        "user": "0", (2)
        "name": "Keon Hoppe"
    }
    ],
    "status": "success",
    "metrics": {
        "elapsedTime": "1.556667ms",
        "executionTime": "1.492667ms",
        "resultCount": 1,
        "resultSize": 193,
        "serviceLoad": 0,
        "transactionElapsedTime": "27.824292ms",
        "transactionRemainingTime": "1m59.972173917s"
    }
}
cbq> 
cbq> -- Set a second savepoint
cbq> SAVEPOINT s2;
{
    "requestID": "c4084621-f542-41cf-9990-06bedcd19583",
    "signature": "json",
    "results": [
    ],
    "status": "success",
    "metrics": {
        "elapsedTime": "117.125µs",
        "executionTime": "81.167µs",
        "resultCount": 0,
        "resultSize": 0,
        "serviceLoad": 0,
        "transactionElapsedTime": "28.638375ms",
        "transactionRemainingTime": "1m59.971360583s"
    }
}
cbq> 
cbq> -- Update the booking documents to change the user
cbq> UPDATE bookings AS b
   > USE KEYS "bf7ad6fa-bdb9-4099-a840-196e47179f03"
   > SET b.`user` = "1";
{
    "requestID": "4277b2e3-2525-4ff9-ae04-10ba22aa9d8b",
    "signature": null,
    "results": [
    ],
    "status": "success",
    "metrics": {
        "elapsedTime": "240.458µs",
        "executionTime": "210µs",
        "resultCount": 0,
        "resultSize": 0,
        "serviceLoad": 0,
        "mutationCount": 1,
        "transactionElapsedTime": "29.538ms",
        "transactionRemainingTime": "1m59.970460542s"
    }
}
cbq> 
cbq> -- Check the content of the booking and user
cbq> SELECT b.*, u.name
   > FROM bookings b
   > USE KEYS "bf7ad6fa-bdb9-4099-a840-196e47179f03"
   > JOIN users u
   > ON KEYS b.`user`;
{
    "requestID": "11ed6da0-da52-4b79-bb74-da1db8b3a816",
    "signature": {
        "*": "*",
        "name": "json"
    },
    "results": [
    {
        "date": "07/24/2021",
        "flight": "WN533",
        "flighttime": 7713,
        "price": 964.13,
        "route": "63986",
        "user": "1", (3)
        "name": "Rigoberto Bernier"
    }
    ],
    "status": "success",
    "metrics": {
        "elapsedTime": "451.959µs",
        "executionTime": "424.417µs",
        "resultCount": 1,
        "resultSize": 200,
        "serviceLoad": 0,
        "transactionElapsedTime": "30.652417ms",
        "transactionRemainingTime": "1m59.969346583s"
    }
}
cbq> 
cbq> -- Roll back the transaction to the second savepoint
cbq> ROLLBACK TRANSACTION TO SAVEPOINT s2;
{
    "requestID": "2ffe8d3b-85f2-4ec2-b7e1-8d774cba1065",
    "signature": "json",
    "results": [
    ],
    "status": "success",
    "metrics": {
        "elapsedTime": "230.458µs",
        "executionTime": "167.458µs",
        "resultCount": 0,
        "resultSize": 0,
        "serviceLoad": 0,
        "transactionElapsedTime": "99.111083ms",
        "transactionRemainingTime": "1m59.900884792s"
    }
}
cbq> 
cbq> -- Check the content of the booking and user again
cbq> SELECT b.*, u.name
   > FROM bookings b
   > USE KEYS "bf7ad6fa-bdb9-4099-a840-196e47179f03"
   > JOIN users u
   > ON KEYS b.`user`;
{
    "requestID": "eb45600b-e2e1-4ca4-aa56-3552ae4141eb",
    "signature": {
        "*": "*",
        "name": "json"
    },
    "results": [
    {
        "date": "07/24/2021",
        "flight": "WN533",
        "flighttime": 7713,
        "price": 964.13,
        "route": "63986",
        "user": "0", (4)
        "name": "Keon Hoppe"
    }
    ],
    "status": "success",
    "metrics": {
        "elapsedTime": "660.25µs",
        "executionTime": "621.792µs",
        "resultCount": 1,
        "resultSize": 193,
        "serviceLoad": 0,
        "transactionElapsedTime": "100.6895ms",
        "transactionRemainingTime": "1m59.899308625s"
    }
}
cbq> 
cbq> -- Commit the transaction
cbq> COMMIT TRANSACTION;
{
    "requestID": "126f4882-7fe0-46a8-b0c1-5cf0a74dade8",
    "signature": "json",
    "results": [
    ],
    "status": "success",
    "metrics": {
        "elapsedTime": "20.328375ms",
        "executionTime": "20.075042ms",
        "resultCount": 0,
        "resultSize": 0,
        "serviceLoad": 0,
        "transactionElapsedTime": "953.673167ms"
    }
}
    1 Beginning a transaction returns a transaction ID.
    2 Before setting the second savepoint, the booking document has user "0", name "Keon Hoppe".
    3 After setting the second savepoint and performing an update, the booking document has user "1", name "Rigoberto Bernier".
    4 After rolling back to the second savepoint, the booking document again has user "0", name "Keon Hoppe".