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-...
By using SQL, DB2® for i supports 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 ...
(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...
DB2 range partition 实战分享DB2 range partition实战分享 db2,分区,range,detach,partition 最近有客户希望在表中保存两天的数据,通过分区来实现: 1、创建具有range partition的表 db2 "create table myrange(c1 int,dtdate) inuserspace1 partition by range(dt) (starting from('2013-07-01')ending at('20 ...
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...
All rows in the table or query result will be partitioned and copied. Type: string (or Expression with resultType string). Returns: the partitionLowerBound value.partitionUpperBound public Object partitionUpperBound() Get the partitionUpperBound property: The maximum value of the partition column ...
Today we will look at an interesting posthow to copy partition table of one hard drive to another in linux. Lets look it at step-wise to understand the scenario. 1. Backup the partition table to a file [root@ngelinux~]#sfdisk-d/dev/sda>sda_partitions[root@ngelinux~]#cat sda_partition...
三个互补的 CREATE TABLE 选项 CREATE table 语句现在提供了三种方式来组织数据库表中的数据。 表1. DB2 特性 CREATE TABLE 语句中的子句 DB2 特性名称 DISTRIBUTE BY HASH DPF —— 数据库分区特性 ORGANIZE BY DIMENSION MDC —— 多维聚类 PARTITION BY RANGE TP —— 表分区 ...
'VARCHAR' is not a recognized built-in function name. 'WHEN MATCHED' cannot appear more than once in a 'UPDATE' clause of a MERGE statement. "EXECUTE AT" with Dynamic Linked Server Name "explicit value must be specified for identity column in table" error in SQL 2000 "FROM clause have ...
Partitioned Tables, DB2 9.1 and 9.5 The Basics New partitions; Roll-in and SET INTEGRITY Remove partitions; Roll-out What about MQT’s, RI Enhancements in DB2 9.7 Partitioned Indexes Higher Availability during DETACH REORG granularity ADD New Partitions to a Partitioned Table ...