syntaxsql -- Syntax for SQL Server and Azure SQL DatabaseCREATESCHEMAschema_name_clause[<schema_element>[ ...n ] ]<schema_name_clause>::={schema_name|AUTHORIZATIONowner_name|schema_nameAUTHORIZATIONowner_name}<schema_element>::={table_definition|view_definition|grant_statement|revoke_statement|de...
ALTER SCHEMA can only be used to move securables between schemas in the same database. To change or drop a securable within a schema, use the ALTER or DROP statement specific to that securable. If a one-part name is used forsecurable_name, the name-resolution rules currently in effect wi...
For example, if the statement ALTER TABLE ADD datetime2 column is used in SQL Server 2012 (11.x), the data type is not translated to nvarchar for SQL Server 2005 (9.x) Subscribers. In some cases, schema changes are blocked on the Publisher. If a publication is set to allow the ...
1 row in set (0.00 sec) 2.2.1.5 host_summary_by_statement_latency表 按照host角度,统计了host执行语句的总体情况。包括执行的sql语句数,执行时间,锁等待时间,返回的数据量等信息。 这个视图拥有如下的列: mysql> select* from host_summary_by_statement_latency limit 1 \G*** 1. row*** host: localh...
reorganization during DML operations for an InnoDB FULLTEXT index, the information about newly deleted words is stored separately, filtered out of search results when you do a text search, and removed from the main search index only when you issue an OPTIMIZE TABLE statement for the InnoDB table...
The maximum space available for statement display is 1024 bytes by default. To change this value, set theperformance_schema_max_sql_text_lengthsystem variable at server startup. Changes affect the storage required for all the columns just named. ...
AlterTableAddTableElementStatement AlterTableAlterColumnOption AlterTableAlterColumnStatement AlterTableAlterIndexStatement AlterTableAlterPartitionStatement AlterTableChangeTrackingModificationStatement AlterTableConstraintModificationStatement AlterTableDropTableElement AlterTableDropTableElementStatement AlterTableFil...
For example, consider a partitioned table created in thetestdatabase using this statement: CREATETABLEtp(c1INT,c2INT,c3VARCHAR(25))PARTITIONBYHASH(c1+c2)PARTITIONS4; ThePARTITION_EXPRESSIONcolumn in aPARTITIONStable row for a partition from this table displaysc1 + c2, as shown here: ...
在执行CHANGE MASTER TO之前,这些表是空的 执行CHANGE MASTER TO之后,在配置参数表replication_applier_configuration和replication_connection_configuration中可以查看到配置信息了。此时,由于并没有启动复制,所以表中THREAD_ID列为NULL,SERVICE_STATE列的值为OFF(这两个字段存在与表replication_applier_status、replication_...
https://github.com/ngaut/builddatabase/blob/master/f1/schema-change.md cn.pingcap.com TiDB 源码阅读系列文章(十七)DDL 源码解析 本文首先会介绍 TiDB DDL 组件的总体设计,以及如何在分布式场景下支持无锁 schema 变更,并描述这套算法的大致流程,然后详细介绍一些常见的 DDL 语句的源码实现。Enjoy～TiDB...