#查看分区信息cursor = mydb.cursor()#查询表的分区信息cursor.execute("SHOW CREATE TABLE tablename") result = cursor.fetchall()#打印分区信息for row in result: print(row) 1. 2. 3. 4. 5. 6. 7. 8. 9. 10. 步骤3:构建查询语句 #构建查询语句query = "SELECT * FROM tablename PARTITION (...
Query OK, 1 row affected (6 min 35.39 sec) (5) mysql> insert into no_part_tab select * from part_tab; Query OK, 8000000 rows affected (40.98 sec) Records: 8000000 Duplicates: 0 Warnings: 0 数据准备好了,下面开始测试: (6) mysql> select count(*) from no_part_tab where -> c3 > ...
mysql> ALTER TABLE np_pk -> PARTITION BY HASH( TO_DAYS(added) ) -> PARTITIONS 4; #ERROR 1503 (HY000): A PRIMARY KEY must include all columns in the table's partitioning function mysql> ALTER TABLE np_pk -> PARTITION BY HASH(id) -> PARTITIONS 4; Query OK, 0 rows affected (0.11 ...
MySQL employs locking in those cases. So the query that reads the data will ensure that drop partition is blocked until it's completed. Any queries starting after drop partition has started will be blocked waiting for the drop partition to complete. So in both cases no problems ...
mysql> delimiter ; mysql> call load_part_tab(); Query OK, 1 row affected (8 min 17.75 sec) [sql]view plaincopy mysql>insertinto no_part_tabselect *from part_tab; Query OK, 8000000 rows affected (51.59 sec) Records: 8000000 Duplicates: 0 Warnings: 0 ...
However, if the table stores year values in anINTcolumn, then a query havingWHERE year_col >= 2001 AND year_col <= 2005can be pruned. Prior to MySQL 5.7.1, partition pruning was disabled for all tables using a storage engine that provides automatic partitioning, such as theNDBstorage eng...
You may also use a PARTITION option in the SELECT portion of an INSERT ... SELECT statement, as shown here: mysql> CREATE TABLE employees_copy LIKE employees; Query OK, 0 rows affected (0.28 sec) mysql> INSERT INTO employees_copy -> SELECT * FROM employees PARTITION (p2); Query OK,...
Documented fix as follows in the MySQL 5.7.37 and 8.0.28 changelogs: A query using an index other than the primary key of a partitioned table sometimes resulted in excessive CPU load. Closed.[20 Dec 2023 6:36] Nilay Shah i am seeing this behaviour even on MYSQL 8.0.32 where we mov...
(0.09 sec) mysql> insert into str_table values ("Beijing"), ("Shanghai"), ("Los_Angeles"); Query OK, 3 rows affected (0.25 sec) mysql> show partitions from str_table; +---+---+---+---+---+---+---+---+---+---...
Re: Drop partition while running a query 2198 Mikael Ronström January 17, 2007 05:39PM Sorry, you can't reply to this topic. It has been closed. Content reproduced on this site is the property of the respective copyright holders. It is not reviewed in advance by Oracle and does not...