4、COALESCE PARTITION(合并分区) CREATETABLE t2( nameVARCHAR(30), startedDATE ) PARTITIONBYHASH(YEAR(started)) PARTITIONS6; ALTERTABLE t2COALESCEPARTITION2; 5、REORGANIZE PARTITION(拆分/重组分区) 1)拆分分区 ALTERTABLEtableALGORITHM=INPLACE,REORGANIZEPARTITION; ALTER TABLE employees ADD PARTITION ( PARTI...
文件系统操作:分区和重新分区操作需要文件系统操作(例如ALTER TABLE 和 PARTITION BY…、REORGANIZE PARTITION 或 REMOVE PARTITIONING)。这意味着文件系统类型和特性、磁盘速度、交换空间、操作系统文件处理效率以及与文件处理相关的 MySQL 服务器选项和变量都会影响这些操作的速度。确保启用大文件支持并正确设置打开文...
4、COALESCE PARTITION(合并分区) CREATE TABLE t2 ( name VARCHAR (30), started DATE ) PARTITION BY HASH( YEAR(started) ) PARTITIONS 6; ALTER TABLE t2 COALESCE PARTITION 2; 5、REORGANIZE PARTITION(拆分/重组分区) 1)拆分分区 ALTER TABLE table ALGORITHM=INPLACE, REORGANIZE PARTITION; ALTER TABLE e...
PARTITION BY LIST COLUMNS(region) PARTITION BY LIST (`region_id`) (PARTITION p_cn_north VALUES IN ('BJ','TJ','HB','NMG'), PARTITION p_cn_south VALUES IN ('GD','GX','HN'), PARTITION p_cn_east VALUES IN ('SH','ZJ','JS'), ); 何时选择LIST DEFAULT HASH分区 如果您想用LIST...
-- 添加分区 ALTER TABLE student_scores ADD PARTITION ( PARTITION p5 VALUES LESS THAN (2024) ); -- 删除分区 ALTER TABLE student_scores DROP PARTITION p0; -- 重组分区 ALTER TABLE student_scores REORGANIZE PARTITION p1, p2 INTO ( PARTITION p1_2 VALUES LESS THAN (2022) ); -- 查看表分区信...
REORGANIZE PARTITION ALGORITHM=INPLACE reorganizes partitions but does not reclaim the space freed on the “old” nodes. You can do this by issuing, for each NDBCLUSTER table, an OPTIMIZE TABLE statement in the mysql client. This works for space used by variable-width columns of in-memory ...
mysql> alter table test2.user -> reorganize partition p1,p2,p3 into -> (partition p01 values less than (8), ->partition p02 values less than (12) -> ); 后续为大家继续讲解有关于mysql大数据的分解存储方式以及思路,如果有不全的地方可以评论。。 Mysql...
.HASH partition-mysql decides row placement using mod; .Key partition,unlike HASH,the partitioning expression does not have to be an integer,the hashing algorithm is similar to PASSWORD(); .RANGE,LIST and HASH must use integer values.
ALGORITHM [=] {DEFAULT | INSTANT | INPLACE | COPY} COPY: 这种操作是在原始表的一个副本上进行的,表数据会逐行从原始表复制到新表。在此过程中,不允许进行并发的数据修改操作。 INPLACE: 这种操作避免了复制表数据,但可能会就地重建表。在操作的准备和执行阶段,系统可能会短暂地对表进行独占的元数据锁定。
To change some but not all the partitions used by a partitioned table, you can useREORGANIZE PARTITION. This statement can be used in several ways: To merge a set of partitions into a single partition. This is done by naming several partitions in thepartition_nameslist and supplying a singl...