命中索引且含 in expr 时,在特定的场景下会导致查询返回的结果集不对。出现该 BUG 需满足 WHERE 条件中含 4 个及以上索引列,且: 第一个列是等值谓词。 第二个列是范围谓词。 第三个列是 in 表达式。 第四个列是任意谓词。 其中,第 1 个条件可是 1 或多个等值谓词,第 2 个条件后也可跟着 0 或多...
Oracle InMemory 列存数据存储在 SGA 内存区,通过 INMEMORY_SIZE 参数来控制 InMemory 列存可以使用的最大内存大小;设置 INMEMORY_SIZE 后即可针对有需要的表(或者部分 Partition、Column)开启 InMemory Column Store,开启后对应用的访问完全透明,Oracle 优化器能根据请求类型自动决定访问行存或者列存来加速请求执行。
Oracle Databasein-memory是它为了同时支持TP和一定的AP分析能力引入的新存储格式和相关改造、这种双存储格式采用了fractured mirror模式,in-memory的列数据是行存数据的子集,同时时刻与行数据保持同步,从而可以支持事务性的查询能力,类似的能力在很多商业数据库中都有不同实现,而反映到优化器侧,基本有如下几种适配方式...
Connect to an on-premises Oracle database from Power Query Online To make the connection, take the following steps: Install and setup an on-premises data gateway. From Power Query Online, select theOracle databaseoption in the data sources selection. ...
Assume that you have Microsoft SQL Server Analysis Services (SSAS) installed on an instance of SQL Server 2016. If you use the ODBC .NET Provider to connect to and query an Oracle database, SSAS 2016 may incorrectly generate a filt...
Oracle Database PostgreSQL SAP ERP SharePoint SQL Server Teradata 桌面流程 使用Microsoft Entra ID 的 HTTP 故障排除 當您嘗試使用內部部署數據源發佈數據流時,可能會遇到下列 MashupException 錯誤: M複製 AzureDataLakeStorage failed to get the response:'The underlying connection was closed: An unexpecte...
Upgrade database from 12.1.0.2 to 12.2.0.1 83150 9 ORA-04036: PGA memory used by the instance exceeds PGA_AGGREGATE_LIMIT 81997 3 Prerequisite check “CheckActiveFilesAndExecutables” failed 71075 3 install oracle goldengate 12c on linux 7 67323 0 How to run SQL tuning advisor for a sql_id...
Oracle Database includes a powerful array of query optimization features that maximize performance and allow DBAs to become more productive by providing innovation in plan stability.
JavaScript Object Notation (JSON) is a lightweight data transfer format. It's the de facto standard for document exchange. So it's likely you'll want to send and receive JSON documents from and to your database. And store them in your tables. Oracle Dat
You can push down an entire query to the database and return just the result. Thetableparameter identifies the JDBC table to read. You can use anything that is valid in a SQL queryFROMclause. Python Python pushdown_query ="(select * from employees where emp_no < 10008) as emp_alias"em...