Inthis post, I introduced how SQL Server 2005 implements query plans on partitioned tables. If you've read that post or used partitioned tables, you may recall that SQL Server 2005 uses a constant scan operator to enumerate the list of partition ids that need to be scanned. As a refreshe...
Using partitioned tables in such scenarios will only make query performance worse, and will not speed up query performance. When the partition table is not used, the number of table associations is only two; when the partition table is used, the number of tables involved in the table associat...
Summary:Although partitioning tables and indexes has always been a design tactic chosen to improve performance and manageability in larger databases, Microsoft SQL Server 2005 has new features that simplify the design. This whitepaper describes the logical progression from manually partitioning data by cr...
而系统分区可以仅建立一个分区表,但不指定分区策略,因此它没有分区键和分区规则。系统分区对上层应用不是透明的,应用往系统分区插入数据时,SQL必须显式的指定分区名,否则会报错。 系统分区通过 create table 的 partition by system 子句创建,后续只需要定义分区,不需要分区键: create table system_part ( id numbe...
exp sales/sales_password tables=sales:sales1999_q1 file=sales1999_q1.dmp IMPORT指定分区: imp sales/sales_password FILE =sales1999_q1.dmp TABLES = (sales:sales1999_q1) IGNORE=y 查看分区信息: user_tab_partitions, user_segments 注:若分区表跨不同表空间,做导出、导入时目标数据库必须预建这些表空...
SQL Server is doing an excellent job of not scanning the partitions that are excluded by some predicates. Recently we have discovered one scenario where the partition elimination does not work against partitioned tables in SQL Server 2005 and this blog describes the conditions leading to the proble...
Azure SQL Database Azure SQL Managed Instance You can create apartitioned table or indexin SQL Server, Azure SQL Database, and Azure SQL Managed Instance by using SQL Server Management Studio or Transact-SQL. The data in partitioned tables and indexes is horizontally divided into units that ca...
LIMIT_SQL DBAOB_CS_REPLICA_STATS DBA_OB__DICTIONARY_IN_LOG DBAOB_DATABASE_PRIVILEGE DBA_OBDATABASES DBA_OB_DEADLOCKEVENT_HISTORY DBAOB_DYNAMIC_PARTITION_TABLESDBA_OB_EXTERNAL_TABLE_FILES DBAOB_FREEZE_INFO DBA_OB_IMPORTTABLE_JOB_HISTORYDBA_OB_IMPORT_TABLE_JOBS DBA_OBIMPORT_...
There are a number of ways using SQL statements to modify partitioned tables; it is possible to add, drop, redefine, merge, or split existing partitions using the partitioning extensions to theALTER TABLEstatement. There are also ways to obtain information about partitioned tables and partitions....
(SQL on OBS or Hadoop) CREATE FOREIGN TABLE (for OBS Import and Export) CREATE FOREIGN TABLE (SQL on other GaussDB(DWS)) CREATE FUNCTION CREATE GROUP CREATE INDEX CREATE REDACTION POLICY CREATE ROW LEVEL SECURITY POLICY CREATE PROCEDURE CREATE RESOURCE POOL CREATE ROLE CREATE SCHEMA CREATE ...