Materialize - Materialize create - 《Vitess v18.0 Documentation》

vtctldclient Materialize create

Materialize create

vtctldclient Materialize create

Create and run a Materialize VReplication workflow.

Synopsis

Materialize is a lower level VReplication command that allows for generalized materialization of tables. The target tables can be copies, aggregations, or views. The target tables are kept in sync in near-realtime. The primary flag used to define the materializations (you can have multiple per workflow) is table-settings which is a JSON array where each value must contain two key/value pairs. The first required key is ‘target_table’ and it is the name of the table in the target-keyspace to store the results in. The second required key is ‘source_expression’ and its value is the select query to run against the source table. An optional key/value pair can also be specified for ‘create_ddl’ which provides the DDL to create the target table if it does not exist — you can alternatively specify a value of ‘copy’ if the target table schema should be copied as-is from the source keyspace. Here’s an example value for table-settings: [ { “target_table”: “customer_one_email”, “source_expression”: “select email from customer where customer_id = 1” }, { “target_table”: “states”, “source_expression”: “select * from states”, “create_ddl”: “copy” }, { “target_table”: “sales_by_sku”, “source_expression”: “select sku, count(*) as orders, sum(price) as revenue from corder group by sku”, “create_ddl”: “create table sales_by_sku (sku varbinary(128) not null primary key, orders bigint, revenue bigint)” } ]

vtctldclient Materialize create

Examples

vtctldclient --server localhost:15999 materialize --workflow product_sales --target-keyspace commerce create --source-keyspace commerce --table-settings '[{"target_table": "sales_by_sku", "create_ddl": "create table sales_by_sku (sku varbinary(128) not null primary key, orders bigint, revenue bigint)", "source_expression": "select sku, count(*) as orders, sum(price) as revenue from corder group by sku"}]' --cells zone1 --cells zone2 --tablet-types replica

Options

  -c, --cells strings                      Cells and/or CellAliases to copy table data from.
  -h, --help                               help for create
      --source-keyspace string             Keyspace where the tables queried in the 'source_expression' values within table-settings live.
      --stop-after-copy                    Stop the workflow after it's finished copying the existing rows and before it starts replicating changes.
      --table-settings JSON                A JSON array defining what tables to materialize using what select statements. See the --help output for more details. (default null)
      --tablet-types strings               Source tablet types to replicate table data from (e.g. PRIMARY,REPLICA,RDONLY).
      --tablet-types-in-preference-order   When performing source tablet selection, look for candidates in the type order as they are listed in the tablet-types flag. (default true)

Options inherited from parent commands

      --action_timeout duration   timeout to use for the command (default 1h0m0s)
      --compact                   use compact format for otherwise verbose outputs
      --format string             The format of the output; supported formats are: text,json. (default "text")
      --server string             server to use for the connection (required)
      --target-keyspace string    Target keyspace for this workflow.
  -w, --workflow string           The workflow you want to perform the command on.