Oracle Database Server 12c (12.1.0.2) and later Oracle Autonomous Database - all versions Before you can connect to an Oracle database using Power Query, you need to install the Oracle Client for Microsoft Tools (OCMT). To connect to an Oracle database with theon-premises data gateway, 64...
What data types are returned? How long are the strings in each column returned? Systems might have very small default and benefit from tuning. For example: Oracle’s defaultfetchSizeis 10. Increasing it to 100 reduces the number of total queries that need to be executed by a factor of 10...
To process the result set that is returned by the database query, the API Gateway needs to know whether the user's attributes are structured as rows or columns in the database table. The following example of a database table shows the user's attributes (Role, Dept, and Email) structured...
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.
In Oracle Database 10g Release 2 it is also possible when defining a dimension to specify that a level in the hierarchy is to be ignored. Oracle Materialized Views & Query Rewrite Page 6 Hints on Defining Dimensions To help you create dimensions, here are a few simple steps to follow. 1...
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 filte...
Data retrieved: All teams not associated with a league. Description: The IS NULL expression can be used to check whether a relationship has been set between two entities. In this case, the query checks whether the teams are associated with any leagues and returns the teams that do not have...
这是Oracle在2015年的一篇paper,介绍了在12c中引入了Database In-Memory时,在优化器侧做的一些扩展和适配,其中包括:统计信息、代价模型、查询变换、access path和join优化、并行、cluster-awareness相关的优化。 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...
Oracle Database in-memory 查询优化 In-memory Statistics Cost Model Predicate Pushdown Parallel Join Processing Join Filter Partition Join Filter Hybrid Data Access Parallel Execution 总结 参考资料 导读 Oracle 12c内存数据库是业界第一个 dual-format(同时支持行存、列存)的数据库。在IO层,仍然使用行存格式...
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...