sql query running slow oracle database

How to query slow SQL statements in MySQL 1. query logs (1) enabling MySQL slow query in Windows In Windows, the configuration file of MySQL is usually my. ini. find [mysqld] and add The code is as follows: Log-

Tags: SQL statement ASE log HTTP Query general table variables SSL Opening the general log will log all SQL statements that arrive at MySQL server. Generally does not open the function, because the amount of log can be very large. However, in some cases, the general log may be temporarily opened for use by a barrier.The relevant parameters are 3:general_log, Log_

the table vertically and horizontally to reduce the table size (sp_spaceuse) 3) upgrade hardware 4) Create an index based on the query conditions, optimize the index, optimize the access mode, and limit the data volume of the result set. Note that the fill factor should be appropriate (preferably the default value 0 ). The index should be as small as possible. Use a column with a small number of bytes to create an index (refer to the index creati

Tags: index solution based on keyword har results in SQL Server failure efficiencyProblem: There's a lot of data on both tables. The A1 field in a table needs to be associated with the B table primary key query A1 field stores multiple B table primary keys The format is: Format 1:B1,B2,B3 Format 2:B4 Format 3:b5,b6 Comma-delimited minority This leads to the use of like '%...% ', charindex, or replace (A1,B1

' or nid in (11,22,33); REF Find one or more values based on an index SELECT * from tb1 WHERE name = ' seven '; Eq_ref Use primary key or unique type when connecting Select Tb2.nid,tb1.name from TB2 left join tb1 on tb2.nid = Tb1.nid; CONST Constant The table has a maximum of one matching row, because only one row, the column values in this row can be considered constants by the remainder of the optimizer, and the const table is fast because they are read only once. Select Nid from tb1 where

Mysql database enables slow query logs and mysql database logs Modify configuration file Add the following two sentences to the configuration file my. ini: 1 log-slow-queries = C: \ xampp \ mysql_slow_query.log2 long_query_time = 3 The first statement is used to define t

* fromsysprocesseswhereBlocked>0) Awhere not exists(Select * from(Select * fromsysprocesseswhereBlocked>0) bwhereA.blocked=spid)Union SelectSpid,blocked fromsysprocesseswhereBlocked>0 IF @ @ERROR0 RETURN @ @ERROR --number of records found for temporary table Select @intCountProperties = Count(*),@intCounter = 1 from#tmp_lock_whoIF @ @ERROR0 RETURN @ @ERROR if @intCountProperties=0 Select 'No blocking and deadlock information now' asmessage--Cycle Start while @intCounter @intCountPr

], [TYPE] Has SELECT, CREATE, DROP, UPDATE, INSERT, for example, "+ SELECT, INSERT". The default value -, that is, it is not included.Db: the log of the database to be processed.Top: the number of first entries sorted by rules.Sort: sort by certain rules, t_sum: sort by the total time; c_sum: sort by the total number of times; c_sum_p: percentage of the number of SQL statement executions to the total number

slow_query_log, Log_output = table, File # The log output will write tables and log files. To facilitate program statistics, it is best to write tables. # General_log_file is not configured here, So general_log will only write the table # In mysql5.1.29 or later, set the following to enable mysql to record the executed SQL statements in the file General_log_file =/log/general. log #5.1.29 previously: # Log =/var/lib/mysql/