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...
分区索引带来的一个显著优势在于,在使用 ALTER TABLE ATTACH PARTITION 和 DETAICH PARTITION 命令进行数据的转入( roll-in )和转出( roll-out) 时, 使用分区索引能够很大程度的提高性能。 在DB2 V9.7 中,以下类型的索引不能是分区索引,只能是非分区索引。 XML 索引 空间数据( spatial data )索引 MDC 块索引(...
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 ...
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 ...
Iceberg-Tabellen verwalten ALTER TABLE RENAME ALTER TABLE SET TBLPROPERTIES ÄNDERN SIE DIE TABELLE, DEAKTIVIEREN SIE DIE TABELLENEIGENSCHAFTEN DESCRIBE DROP TABLE SHOW CREATE TABLE SHOW TBLPROPERTIES Evolve Iceberg-Tabellenschema ALTER TABLE ADD COLUMNS ALTER TABLE DROP COLUMN ALTER TABLE CHANGE COLUMN...
新建第2个分区/dev/vdb2 代码语言:javascript 代码运行次数:0 运行 AI代码解释 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Usi...
Newpartitions;Roll-inandSETINTEGRITY Removepartitions;Roll-out WhataboutMQT’s,RI EnhancementsinDB29.7 PartitionedIndexes HigherAvailabilityduringDETACH REORGgranularity TablePartitioninginDB2LUW Partitionatablebyrange,variousmethodstodefinerangesandgranularity ...
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 ...