Amazon Redshift is a fully managed, petabyte scale, massively parallel data warehouse that offers simple operations and high performance. You will hear a lot about “Data Skew” if you are developing data warehouse on Redshift, Netezza, Teradata, hive or Impala database.. pg_dump -U user_name -s -t table_name -d db_name Note: -s used for schema only dump if you want to take the data only dump , you can use -a switch. Most relational databases use row-level locks. Examples Example 1: The following example retrieves table metadata for all of the tables in the dataset named mydataset.The query selects all of the columns from the INFORMATION_SCHEMA.TABLES view except for is_typed, which is reserved for future use.The metadata returned is for all tables in mydataset in your default project — myproject.. mydataset … Amazon Redshift retains a great deal of metadata about the various databases within a cluster and finding a list of tables is no exception to this rule. However, Amazon Redshift uses table-level locks. Redshift update performance. oid = c . In the MPP database, performance of the system is directly linked to uniform distribution of the user data across all data node slices in the system. You might experience locking conflicts if you perform frequent DDL statements on user tables or DML queries. Updating and inserting new data, You didn't mention what percentage of the table you're updating but it's important to note that an UPDATE in Redshift is a 2 step process:. UNION SELECT c. oid:: bigint as table_id , n. nspname AS schemaname, c. relname AS tablename, 600000000 AS seq, '; ' AS ddl FROM pg_namespace AS n INNER JOIN pg_class AS c ON n . When enabled, Redshift uses machine learning to predict short running queries and affect them to this queue, so there is no need to define and manage a queue dedicated to short running queries, for more info. If you want to get the table structure with create statement, constraints and triggers, you can use pg_dump utility. select c.oid,c. select c.oid,c. We’re getting a table_id (911077), a process_id (29748) and two transaction_id ‘s (56608449, 56608448). Using these three pieces of information we … Locking also determines which operations can be performed in those sessions. relnamespace For example, below example shows current updates on tables in the database. Amazon Redshift locks tables to prevent two users from updating the same table at the same time. * from SVV_EXTERNAL_TABLES c; For common tables I have this value. * from pg_class c You can use the STV_LOCKS table to view any current updates on tables in the database. Unfortunately, these system tables are having a very little lifetime of 2–7 days. The stv_recents view has all recently queries with their status, duration, and pid for currently-running queries. 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