![]() ![]() If set to on, queries return an error and in some cases a suggested resolution if they cannot run entirely in their home region. Indicates whether the cost-based optimizer will plan certain queries using a zig-zag merge join algorithm, which searches for the desired intersection by jumping back and forth between the indexes based on the fact that after constraining indexes, they share an ordering. Indicates whether CockroachDB will use a specialized execution operator for inserting into a table. Indicates whether multiple statements in a single query (a "batch statement") will all run in the same implicit transaction, which matches the PostgreSQL wire protocol. For more information about how FOR UPDATE locking works, see the documentation for SELECT FOR UPDATE.Įnable_implicit_transaction_for_batch_statements Indicates whether UPDATE and UPSERT statements acquire locks using the FOR UPDATE locking mode during their initial row scan, which improves performance for contended workloads. When enabled, the home regions of rows in REGIONAL BY ROW tables are automatically set to the region of the gateway node from which any UPDATE or UPSERT statements that operate on those rows originate. By default, CockroachDB determines which queries are faster to execute if distributed across multiple nodes, and all other queries are run through the gateway node. The query distribution mode for the session. This setting does not apply to internal queries, which may plan full table or index scans without checking the session variable. If set to on, all queries that have planned a full table or full secondary index scan will return an error message. If set to off, read-only transactions will only use follower reads if an AS OF SYSTEM TIME clause is specified in the statement, with an interval of at least 4.8 seconds. If set to on, all read-only transactions use AS OF SYSTEM TIME follower_read_timestamp() to allow the transaction to use follower reads. If set to on, only read operations are allowed in transactions in the current session if set to off, both read and write operations are allowed. ![]() The default transaction access mode for the current session. The supported options are regular, critical, and background. The default transaction quality of service for the current session. The supported options are low, normal, and high. The default transaction priority for the current session. See Full-Text Search.Īll transactions execute with SERIALIZABLE isolation. New in v23.1: The dictionary used to normalize tokens and eliminate stop words when calling a full-text search function without a configuration parameter. The value set by the cluster setting ( ISO,MDY, by default). Accepted values include ISO,MDY, ISO,DMY, and ISO,YMD. The input string format for DATE and TIMESTAMP values. Whether to prevent the optimizer from considering column size when costing plans.ĭatabase in connection string, or empty if not specified. If set to off, COPY FROM statements are segmented into batches of 100 rows unless issued within an explicit transaction, matching the CockroachDB behavior in versions prior to v22.2. If set to on, COPY FROM statements are committed atomically, matching PostgreSQL behavior. Accepted values include debug5, debug4, debug3, debug2, debug1, log, notice, warning, and error. The severity level of notices displayed in the SQL shell. The mode for conversions from STRING to BYTES. The current application name for statistics collection.Įmpty string, or cockroach for sessions from the built-in SQL client. ![]() The value, or list of values, to assign to the session variable. Executing a ROLLBACK, ROLLBACK TO SAVEPOINT, or RELEASE TO SAVEPOINT statement rolls back any variables set by SET LOCAL. ![]()
0 Comments
Leave a Reply. |