


The company is using partition online. The partition field of one table is wrong and needs to be rebuilt. It turns out that there is no way to do it directly with one SQL like modifying the primary key field or modifying the index field. Instead, we need to build a temporary table and have down time, so I read the documentation carefully and studied the details of the partition. When my company takes it online, during the low business peak period at 1 am, execute: Create a temporary table CREATE TABLE tbname_TMP ( SHARD_ID INT NOT NULL, ... xxx_DATE DATETIME NOT NULL, PRIM
Introduction: The company is using partition online. The partition field of one table is wrong and needs to be rebuilt. It turns out that there is no way to do it directly with one SQL like modifying the primary key field or modifying the index field. . Instead, we need to build a temporary table and have down time, so I read the documentation carefully and studied the details of the partition.
Introduction: Although there are answers to this problem on the Internet, they failed to help me solve it. I found it myself. Another way. I downloaded the project through SVN and reported this error. The gradle version has been modified in gradle-wrapper.properties, which is consistent with the previous gradle version that did not report errors. Just change http\://services.gradle.org/distributions/gradle-1.1-all.zip to
3. Oracle Partition Partition Detailed Summary
Introduction: Detailed summary of Oracle Partition partition, update partition fields, change the partition to which it belongs, and the data changes internally Inserting source data into new partitions, updating new data, and old source data
4. hive metadata database configuration, metadata
Introduction: 1. What is hive metadata? Hive metadata is some basic elements of hive, mainly including the basic attributes of hive table, as follows (1) database name, table name, field name and type, partition field and type of hive table (2) table partition, partition Attribute location, etc. (3) serdeproperties, tblproperties, etc. can be passed through desc
5. ORA-14402: Updating the partition key column will cause changes to the partition
Introduction: By default, Oracle's partition table does not allow update operations for partition fields. If a partition field is updated, an error will be reported -ORA-14
6. sqlserver2008 partitions string date fields
Introduction: I recently made a log database for the company’s products For data partitioning, the database uses SQL Server 2008. Here is a reference for everyone. It should be noted that many online example partition fields use the time type, but here, the time field was originally designed to use the string type in the database. So the partition field used here is
Introduction: -- MySQL partition, sub-partition and the processing of Null entry. Notes after reading the official document. -- KEY Partitioning Partitioning by key is similar to partitioning by hash, except that where hash partitioning employs a user -defined expression, the hashing function for
8. MYSQL’s partition field must be included in the primary key field_MySQL
Introduction: MYSQL’s partition field must be included in the primary key field Within the field
9. The impact of different MySQL storage engines and different partition fields on queries_MySQL
Introduction: The impact of different MySQL storage engines and different partition fields on queries
10. MySQL partition table partition online modification of partition fields_MySQL
Introduction: MySQL partition table partition online modification of partition fields
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MySQL's position in databases and programming is very important. It is an open source relational database management system that is widely used in various application scenarios. 1) MySQL provides efficient data storage, organization and retrieval functions, supporting Web, mobile and enterprise-level systems. 2) It uses a client-server architecture, supports multiple storage engines and index optimization. 3) Basic usages include creating tables and inserting data, and advanced usages involve multi-table JOINs and complex queries. 4) Frequently asked questions such as SQL syntax errors and performance issues can be debugged through the EXPLAIN command and slow query log. 5) Performance optimization methods include rational use of indexes, optimized query and use of caches. Best practices include using transactions and PreparedStatemen

MySQL is suitable for small and large enterprises. 1) Small businesses can use MySQL for basic data management, such as storing customer information. 2) Large enterprises can use MySQL to process massive data and complex business logic to optimize query performance and transaction processing.

InnoDB effectively prevents phantom reading through Next-KeyLocking mechanism. 1) Next-KeyLocking combines row lock and gap lock to lock records and their gaps to prevent new records from being inserted. 2) In practical applications, by optimizing query and adjusting isolation levels, lock competition can be reduced and concurrency performance can be improved.

MySQL is not a programming language, but its query language SQL has the characteristics of a programming language: 1. SQL supports conditional judgment, loops and variable operations; 2. Through stored procedures, triggers and functions, users can perform complex logical operations in the database.

MySQL is an open source relational database management system, mainly used to store and retrieve data quickly and reliably. Its working principle includes client requests, query resolution, execution of queries and return results. Examples of usage include creating tables, inserting and querying data, and advanced features such as JOIN operations. Common errors involve SQL syntax, data types, and permissions, and optimization suggestions include the use of indexes, optimized queries, and partitioning of tables.

MySQL is an open source relational database management system suitable for data storage, management, query and security. 1. It supports a variety of operating systems and is widely used in Web applications and other fields. 2. Through the client-server architecture and different storage engines, MySQL processes data efficiently. 3. Basic usage includes creating databases and tables, inserting, querying and updating data. 4. Advanced usage involves complex queries and stored procedures. 5. Common errors can be debugged through the EXPLAIN statement. 6. Performance optimization includes the rational use of indexes and optimized query statements.

MySQL is chosen for its performance, reliability, ease of use, and community support. 1.MySQL provides efficient data storage and retrieval functions, supporting multiple data types and advanced query operations. 2. Adopt client-server architecture and multiple storage engines to support transaction and query optimization. 3. Easy to use, supports a variety of operating systems and programming languages. 4. Have strong community support and provide rich resources and solutions.

InnoDB's lock mechanisms include shared locks, exclusive locks, intention locks, record locks, gap locks and next key locks. 1. Shared lock allows transactions to read data without preventing other transactions from reading. 2. Exclusive lock prevents other transactions from reading and modifying data. 3. Intention lock optimizes lock efficiency. 4. Record lock lock index record. 5. Gap lock locks index recording gap. 6. The next key lock is a combination of record lock and gap lock to ensure data consistency.


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