mysql update statistics

/{print '} ')If ["$output" = = ""];thenEcho 0ElseEcho $outputFi;;Initoutput=$ (mysql-uroot-pxxxxxx-e "select * from Huiyewang.snto_session;" | Awk-f "|" ' {print $} ' |awk ' {print $9} ' |awk ' {++s[$NF]}end{for (A in S) print A,s[a]} ' |awk '/init/{print $ ')If ["$output" = = ""];thenEcho 0ElseEcho $outputFi;;PUBLIC_FIND_PWD)output=$ (mysql-uroot-pxxxxxx-e "select * from Huiyewang.snto_session;" | Awk-f "|

Tags: tab ROM failure execution plan TE call for Index statistics有时候建立索引的时候不走索引，排除了字段数据问题和sql写法问题之外，应该是统计信息有问题，得重新收集。一：解锁统计信息为了稳定执行计划，一般统计信息都会被锁住的，在更新统计信息的时候得先解锁。①按用户schema解锁：EXEC DBMS_STATS.UNLOCK_schema_STATS(‘user_name‘);②按表模式解锁：先查出被锁定的表select table_name from user_tab_statistics where stattype_locked is not null；然后exec dbms_stats.unlock_table_stats(‘user_name‘,‘表名‘);二：收集统计信息方法：1. Analysis Tablebegin dbms_stats.gather_table_stats ( ownname

The basic algorithm for automatically updating statistics is: · If the table is in the tempdb database table the cardinality is less than 6, automatically updated to the table for each of the six modifications. · If the base of the table is greater than 6, but less than or equal to 500, update the status every 500 of the modifications. · If the cardinality is greater than 500, the table changes when the

Tags: mysql row to columnI read a blog post very well, it is easy to understand after reading, the post address is: http://www.cnblogs.com/lhj588/p/3315876.htmlRecently I met a friend in the group and said, so record:Assume that the table name is T. There are six fields in the list p1,p2,p3,s1,s2,s3Now wantSum of S1 values when p1=100Sum of S2 values when p2=100Sum of S3 values when p3=100To create a table:CREATE TABLE ' t ' ( ' id ' int (one) not nul

Word Frequency Statistics:Function 1: Small file input Keyboard enter command under Console.Enter file name in console: Use scanner to get console dataSystem.out.println ("Please enter the file path to be counted"); Scanner sc = new Scanner (system.in); String road = Sc.nextline (); FileInputStream fis = new FileInputStream (road);//file path to be read InputStreamReader ISR = new InputStreamReader (FIS);// Character stream BufferedReader infile = new BufferedReader (ISR); BufferGet words from a

->next = Sortedmerge (pre->next,next); } Else{result=Next; Result->next = Sortedmerge (pre,next->next); } returnresult;}Working with wordsvoidWordjob (Charword[]) { inti,k; for(i =0; I) { if(word[i]>='A' word[i]'Z') {Word[i]+= +; Continue; } if(word[i]'a'|| Word[i]>'Z') { if(i = = (strlen (word)-1) ) {Word[i]=' /'; } Else{k=i; while(I strlen (Word)) {Word[i]= word[i+1]; I++; } I=K; } } }}Free all node memory.void release () {

(), INTERVAL Day) End If; If searchtype = 4 Then /* Data statistics by Month */ Select DateDiff (StartTime, endTime) into Day_num; If Day_num Then Select count (d.acct_id), d.acct_old_time from developer D where 1=1 and Date_sub (Curdate (), INTERVAL Day_num Day) End If; If Day_num >7 day_num Select count (d.acct_id), d.acct_old_time from developer D where 1=1 and Date_sub (Curdate (), INTERVAL Day_num Day) End If; If Day_n

Segment tree Interval Update, interval statistics poj 2777 Count Color Question: Dye a board with a length of L. The Board can be divided into numbers 1, 2, 3... L segment. There are O operations in total. There are two types of operations: 1. color A to B as C 2. ask how many colors are there between A and B. The color ranges from 1 to T, and cannot exceed 30. Idea: 1. Because there are no more than 30 co

No IFEXISTS (SELECTnameFROMsys. databasesWHEREnameNTest) BEGINUSETestEXECsp_updatestatsENDGO No if exists (SELECT name FROM sys. databases WHERE name = N 'test') BEGINUSE TestEXEC sp_updatestatsENDGO Update statistics of tables in the database --> $velocityCount--> --> IF EXISTS(SELECT name FROM sys.databases WHERE name=N'Test')BEGINUSE TestEXEC sp_updatestatsENDGO

No DECLARE @ sqlnvarchar (300 )? DECLAREUpdateStatsForAllDBsCURSORREAD_ONLYFORselectnamefromsysdatabases? DECLARE @ namenvarchar (255) OPENUpdateStatsForAllDBs? FETCHNEXTFROMUpdateStatsForAllDBs No DECLARE @ SQL nvarchar (300 )? DECLARE UpdateStatsForAllDBs CURSORREAD_ONLYFOR select name from sysdatabases? DECLARE @ name nvarchar (255) OPEN UpdateStatsForAllDBs? Fetch next from UpdateStatsForAllDBs Update statist