MQT造句
1, This way, queries accessing the MQT will return the same result throughout the day even though the underlying data is being updated periodically.
2, The paper analyzes existing problems of MQT series pneumatic roof bolter in use and maintenance and puts forward the concrete measures of maintaining the roof bolter.
3, With MQTs, when they are updated to remove the corresponding summary data, it is advisable to use table partitioning on the MQT and to define the same data partitions as on the base table.
4, A materialized query table (MQT) is a table that materializes the pre-computed result of a query involving one or more tables or nicknames.
5, The MQT refresh time is now reduced, because often only the small MQTs based on [CurrentMonthSales] must be refreshed.
6, For example, if the considered MQT is a refresh-deferred system-maintained MQT, this special register must be set to ALL or SYSTEM.
7, The example below shows a system-maintained MQT, to illustrate the syntax and the steps to follow in defining an MQT and enabling the MQT for routing.
8, A customer experiences performance issue while refreshing an MQT as part of a batch run.
9, When a REFRESH statement is invoked for an MQT defined with nicknames in it, it deletes any pre-existing data in the MQT and populates the data afresh.
10, Indexes recommended for MQTs are designed to improve workload performance and not the MQT refresh performance.
11, Insert, update, or delete of data into the MQT directly by the user is disallowed.
12, Next, to populate the MQT with some data, we will import data that had been exported from the EMPLOYEE and SALES tables.
13, The existence of many candidate MQTs might prevent the compiler from choosing the best MQT for that query.
14, Loading from a cursor is also an efficient method to populate a materialized query table (MQT) referencing a nickname.
15, It gives hints and tips to determine whether an MQT is being used by the query and, if not, what prevented the use of that MQT.
16, The section walks you through all the steps of creating an MQT, populating it with data, and enabling it for optimization.
17, For example, if the base table is DPF partitioned, the design of the MQT should consider whether to replicate the MQT across the data partitions.
18, As the data for the base table(s) changes, the MQT needs to be updated accordingly.
19, Any changes in the form of insert, update or delete of the data to the table(s) or nicknames used in the MQT definition will not automatically result in an insert, update or delete of data in the MQT.
20, If the query is executed at a higher isolation level than the isolation level at which the MQT is created, that MQT will not be considered for execution of the query.
21, The query optimizer will give priority to an execution plan involving an MQT over a plan that involves access to remote tables.