SQL Server 2014 Buffer Pool Extension part 3: system monitoring
In this article I’d like to tell about monitoring tools available in SQL Server 2014 to evaluate the performance of Buffer Pool Extension.
First of all there is a system view sys.dm_os_buffer_pool_extension_configuration that provides information on the configuration of BPE. It shows whether BPE is enabled or not, the location of the file and its size. Although the specification says that there may be several BPE files it is impossible to open all, at least in CTP1. Maybe later the situation will change.
What is more, the column is_in_bpool_extension is added to the system view sys.dm_os_buffer_descriptors, which allows to get information on separate pages. This means now you can get a list of separate pages across databases with regard to how many pages and which ones are stored in the BPE. For example, here is a query allowing you to see the percentage of database pages stored in memory and in BPE.
Utilizing given approach each client get his own database. In such case every client`s data stays isolated from others. It simplifies backing up the data, installing new clients but causes higher cost of maintenance.
MoreSubject recursion is well covered in the literature, but, nevertheless, the problem of output “tree” does not mean the client and SQL Server many baffled. So, put the problem: there is a table with the name and record id field indicating the parent identifier. Immediately fill in this table, some sort of test data:
MoreIn our time of greatest prevalence of databases were relational databases, which are the main targets of the tables and the relationships between them. Tables can solve most problems for data storage and manipulation. But in the real world entity requiring storage is not always presented in a tabular form. One of these very common types of data structures other than the table is a tree structure, where each data element is the parent and the offspring. An example of such a structure may be the structure of state enterprises, which is headed by the director (the root of the tree), his deputies, heads of departments from which are subject to certain deputies, employees of departments, which are subject to the rulers.
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Utilizing given approach each client get his own database. In such case every client`s data stays isolated from others. It simplifies backing up the data, installing new clients but causes higher cost of maintenance.
Subject recursion is well covered in the literature, but, nevertheless, the problem of output “tree” does not mean the client and SQL Server many baffled. So, put the problem: there is a table with the name and record id field indicating the parent identifier. Immediately fill in this table, some sort of test data:
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