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If the LAN standards associated with the source and destination nodes are dissimilar (e.g., Ethernet and token ring), the router may also alter the format of the packet so that it may be received by the destination node.Routers typically operate at the network layer of a communications protocol stack used by the network, such as the internetwork layer of the Transmission Control Protocol/Internet Protocol (TCP/IP) communications architecture.For different parameters, the same execution plan becomes inefficient.For more information on this topic, see Parameter Sniffing.
A potential problem arises when that first compilation may not have used the most common sets of parameters for the usual workload.
SQL Server post migration step is very crucial for reconciling any data accuracy and completeness, as well as uncover performance issues with the workload.
Below are some of the common performance scenarios encountered after migrating to SQL Server Platform and how to resolve them.
These include scenarios that are specific to SQL Server to SQL Server migration (older versions to newer versions), as well as foreign platform (such as Oracle, DB2, My SQL and Sybase) to SQL Server migration. When migrating from an older version of SQL Server to SQL Server 2014 (12.x) or newer, and upgrading the database compatibility level to the latest available, a workload may be exposed to the risk of performance regression.
This is because starting with SQL Server 2014 (12.x), all Query Optimizer changes are tied to the latest database compatibility level, so plans are not changed right at point of upgrade but rather when a user changes the database option to the latest one.