In addition, the number of distinct values in an index key for a large table must be sufficient for Db2 to use the index to retrieve data. Otherwise, Db2 might choose to do a table space scan. You can create two types of secondary indexes: those that are partitioned (called data-...
具体配置方式,就是在 schema.xml 的 table 节点中添加一个 type 属性,值为 global: 配置完成后,重启 mycat ./bin/mycat restart 1. 重启完成后,要删除之前已经创建的t_user表,然后重新创建表,创建完成后,向表中插入数据,可以看到,db1、db2 以及 db3 中都有数据了。 这里 虽然查询出来的记录只有一条,实际...
By using SQL,DB2® for isupports partitioned tables. Partitioning allows for the data to be stored in more than one member, but the table appears as one object for data manipulation operations, such as queries, inserts, updates, and deletes. The partitions inherit the design characteristics ...
(STARTING ('1/1/1992') ENDING ('12/31/1992') EVERY1MONTH) CREATETABLEsales(invoice_date date, inv_monthintNOTNULLGENERATED ALWAYSAS(month(invoice_date)), inv_yearINTNOTNULLGENERATED ALWAYSAS(year(invoice_date)), item_idintNOTNULL, cust_idintNOTNULL) PARTITIONBYRANGE (inv_year, inv_mont...
图1. DB2 v9 中表分区特性及其索引 另外,表分区特性使得用户可以使用 ALTER TABLE … ATTACH PARTITION 命令和 DETACH PARTITION 命令轻易的实现表数据的转入( roll-in )和转出( roll-out) ,这两个操作都不需要有任何数据的移动,从而很大的提高性能。同时我们也看到,这两个操作之后需要对索引进行维护,例如 ATTACH...
Number of employees in that partition. 该分区中的员工数目。Query the partition for all employees. 查询分区上的所有员工。Service partition. 服务分区。We have shown you how to partition one table. 我们已经展示了如何划分一个表。This is the electronic partition function. 这是电子的配分函数。In the...
Hi!I wander what is the dictionary containing table partitioning information like partition key, partitioning type, partittion range, etc. Actually w
Defines values for SapTablePartitionOption. KnownSapTablePartitionOption can be used interchangeably with SapTablePartitionOption, this enum contains the known values that the service supports. Known values supported by the service None PartitionOnInt
Db2TableDataset DeleteActivity DeleteDataFlowDebugSessionRequest DelimitedTextDataset DelimitedTextReadSettings DelimitedTextSink DelimitedTextSource DelimitedTextWriteSettings DependencyCondition DependencyReference DependencyReferenceUnion DistcpSettings DocumentDbCollectionDataset DocumentDbCollectionSink DocumentDbCollectionSource Dri...
新建第2个分区/dev/vdb2 代码语言:javascript 复制 Command(mforhelp):n Partition type:pprimary(1primary,0extended,3free)e extendedSelect(defaultp):p//类型为p(主分区)Partitionnumber(2-4,default2):2//分区编号2Firstsector(411648-20971519,default411648)://起始位置默认Usingdefaultvalue411648Last sector...