对于这个有筛选条件的T-SQL语句,这里SQL Server果断的采用的并行运算的方式,聚集索引也是并行扫描,因为我电脑为4个逻辑CPU(其实是2颗物理CPU,4线程),所以这里使用的是4线程并行扫描四次表,每个线程扫描一部分数据,然后汇总。 这里总共用了4个线程,其中线程0为调度线程,负责调度所有的其它线程,所以它不执行
For more information, see In-Memory Optimization Overview and Usage Scenarios. Only one MEMORY_OPTIMIZED_DATA filegroup is allowed per database. For code samples that create a filegroup to store memory-optimized data, see Creating a Memory-Optimized Table and a Natively Compiled Stored Procedure. ...
Specifies that the filegroup stores memory_optimized data in the file system. For more information, seeIn-Memory Optimization Overview and Usage Scenarios. Only one MEMORY_OPTIMIZED_DATA filegroup is allowed per database. For code samples that create a filegroup to store memory-optimized data, see...
For more information, see In-Memory Optimization Overview and Usage Scenarios. Only one MEMORY_OPTIMIZED_DATA filegroup is allowed per database. For code samples that create a filegroup to store memory-optimized data, see Creating a Memory-Optimized Table and a Natively Compiled Stored Procedure. ...
{ LOCAL | GLOBAL } } <database_mirroring_option> ALTER DATABASE Database Mirroring <date_correlation_optimization_option> ::= DATE_CORRELATION_OPTIMIZATION { ON | OFF } <db_encryption_option> ::= ENCRYPTION { ON | OFF | SUSPEND | RESUME } <db_state_option> ::= { ONLINE | OFFLINE |...
{ON|OFF} |ASYNC_STATS_UPDATE_WAIT_AT_LOW_PRIORITY= {ON|OFF} |OPTIMIZED_PLAN_FORCING= {ON|OFF} |DOP_FEEDBACK= {ON|OFF} |CE_FEEDBACK= {ON|OFF} |PARAMETER_SENSITIVE_PLAN_OPTIMIZATION= {ON|OFF} |LEDGER_DIGEST_STORAGE_ENDPOINT= {<endpoint URL string>|OFF} |OPTIMIZED_SP_EXECUTESQL= {...
Azure SQL ServerIn addition to the benefits of SQL Server, offers dynamic scalability with no downtime, intelligent optimization, global scalability and availability, elimination of hardware costs, and reduced administration. Choose the best Azure SQL Server option ...
Now, nothing “stands out” like we’ve seen in the rest of this section but increasing work_mem will make it go back to the hash join. Learning when your query should have a specific plan shape and noticing when it has a different one can provide some good PostgreSQL optimization opportu...
DATE_CORRELATION_OPTIMIZATION OFF Sì DB_CHAINING OFF No ENCRYPTION OFF No MIXED_PAGE_ALLOCATION In... No NUMERIC_ROUNDABORT OFF Sì PAGE_VERIFY CHECKSUM Sì PARAMETERIZATION SEMPLICE Sì QUOTED_IDENTIFIER OFF Sì READ_COMMITTED_SNAPSHOT OFF Sì RECOVERY Dipende dall'edizione di SQL Server* Sì RECU...
Thedatabase compatibility levelsetting provides backward compatibility with earlier versions of SQL Server in what relates to Transact-SQL and query optimization behaviors only for the specified database, not for the entire server. Starting with compatibility mode 130, any new query plan affecting fixes...