sql server performance tuning books

attention, on the SQL Server performance tuning of the content is very broad, followed by the analysis in the article.If you have any questions, you can leave a message or private messages, and look forward to an in-depth study of your child's shoes with SQL

hash matching only need to extract the different column values can be, so compared to performance, there is no doubt that the hash matching algorithm here is notch above algorithm.And how does SQL Server know about these two columns of content distribution type? This is where the powerful statistics of SQL

use of hash matching only need to extract the different column values can be, so compared to performance, there is no doubt that the hash matching algorithm here is notch above algorithm.And how does SQL Server know about these two columns of content distribution type? This is where the powerful statistics of SQL

. Room number andAcquisition Time>='2013-11-6 0:00:00' andAcquisition Time'2013-11-7 0:00:00') Workaround, create a memory table in SQL, first identify the part, and then use the first part of the results to query the final result. It can be checked in seconds. SET STATISTICSIo onDBCCDropcleanbuffers--Turn off cachingDBCCFreeproccache--Turn off cachingSELECTT.* frommeasure_heat TWHERECommunity number=' -' andAcquisition Time=( SELECT min(Acquisit

alarm tcp:time wait bucket table overflow. However, you can increase concurrency and save ports.Net.ipv4.tcp_max_tw_buckets = 8000Increase the range of available ports, as the effect impliesNet.ipv4.ip_local_port_range = 1024 65000Last two parameters I forgot what it meant, but also add it:)Net.ipv4.tcp_keepalive_time = 1200Net.ipv4.tcp_max_syn_backlog = 81920At this point, your Nginx server can be happy to run up!Redis

--windows Machine NameSysprep.exe check general, and turn off the machine--Instance NameSELECT @ @SERVERNAME, serverproperty (' SERVERNAME ')If SERVERPROPERTY (' servername ') Begindeclare @server sysnameSet @server = @ @servernameexec sp_dropserver @server = @serverSet @server = Cast (serverproperty (' servername ') a

Tags: process optimizer consolidation requires merging auto overwrite session accessThe full execution order of the SELECT statement:The full execution order of the SQL SELECT statement: 1. The FROM clause assembles data from different data sources; 2. The WHERE clause filters the record rows based on the specified criteria, 3, the GROUP BY clause divides the data into multiple groupings, 4, uses the aggregation function for the calculation, 5, uses t

be sorted, or it can be added to a column (like joins or additions). Any non-indexed item in the ORDER BY statement, or a computed expression, will slow down the query. Double-check the order BY statement to find non-indexed items or expressions that degrade performance. The solution to this problem is to rewrite the order BY statement to use the index, or you can establish another index for the column you are using, and you should absolutely avoid u

10.1 Order problems for connecting query tablesThe parser for SQL Server processes the table names in the FROM clause in a right-to-left order, so the table that is written in the FROM clause (the underlying table driving tables) will be processed first, and in the case of multiple tables in the FROM clause, the tables with the fewest number of record bars must be selected as the underlying table. When

Refer to the book SQL. server.2005. Technical Insider "series ConclusionThis article first to this bar, short, easy to understand, this article mainly introduces the query plan of the joint operators, the next we analyze SQL Server parallel operations, in multicore hyper-threading gathered today, see

"SQL Server 2005 Deadlock resolution Discovery" mentioned a while ago, serious deadlock, the average occurrence of a deadlock every day, in the resolution and processing of SQL server2005 deadlock in the search for a lot of information and think of a lot of ways, on why deadlocks and how less deadlock has a further understanding, Here to share with you:

rownumObviously, this writing will result in reading the table first, then sorting, and then taking the first 5 records, the plan is as follows:If we write like this, the semantics are the same, but it saves a lot of reading and sorting costs:Select/*+ Index (T1,IDX1_T1) */* from T1 where rownumThe execution plan for this SQL is as follows:As you can see, the SQL does not follow the hint instructions and s

ConclusionThis article first to this bar, short, easy to understand, this article mainly introduces the query plan of the joint operators, the next we analyze SQL Server parallel operations, in multicore hyper-threading gathered today, see SQL How server uses parallel operations to maximize the use of existing ha

When interviewing MySQL DBA or those planning to do MySQL performance optimization, my favorite question is: MySQL server in accordance with the default settings after installation, what should be done to adjust it? To my surprise, how many people can not give a reasonable answer to this question, and how many servers are running under the default settings. Although you can adjust the variables on many My

future space to introduce, interested can advance attention.Reference documents Microsoft Books Online Read page Refer to the book SQL. server.2005. Technical Insider "series If you have any questions, you can leave a message or private messages, and look forward to an in-depth study of your child's shoes with

DISTINCTdatabase_id,object_idFrom Sys.dm_db_missing_index_details) as Ddmid on ddmid.database_id = ddios.database_idand ddmid.object_id = ddios.object_idWHERE Ddios.page_lock_wait_in_ms > 0 and object_name (ddios.[ OBJECT_ID]) like ' Pos_transmst 'ORDER by Ddios.page_lock_wait_count DESC;/*******************************************************************************************--page IO Latch Wait *******************************************************************************************/ SEL

Label:The IO performance of SQL Server is affected by the IO latency of the physical disk and the IO operations performed internally by SQL Server. When monitoring disk performance, the primary measure (metric) is IO latency, whic

server| optimization In the actual work, especially in the production environment, the optimization of SQL statements is very important, and it also plays a significant role in improving the performance of the database. We are always complaining about the performance of the machine, always complaining about the trivia

By changing the vast majority of SQL queries into stored procedures, such operations can undoubtedly improve some of the performance. All operations using "SELECT * from XXX" are specific to the required fields. A query that uses joins to connect more than 2 large amounts of data, and queries that have little variation on the underlying datasheet, uses the view and indexes the view. The reason comes from th

I like to think of tools bundled with SQL Server as inverted pyramid type, tools for diagnosing and checking general problems at the top, finding and diagnosing problem-specific areas of the tool at the bottom. In addition to providing a convenient way to write SQL scripts, Query Analyzer is the resource you need to use when you need to address specific