MySQL queries the most repeated occurrences of the recordHttp://database.51cto.com/art/201011/235139.htm2010-11-25 14:40 Anonymous Internetfont Size:T | T For MySQL database, query is always the most important function, the following will teach you to query the most repeated occurrences of the record, for your reference.Ad:51cto mobile app Security Salon! It's g
For the annotation of the script and the whole idea, I'll put it in the script for you.
#!/bin/bashMon_file= "$" # Specify the script path to monitorSEC=60 # Specifies the frequency to monitor, that is, how often to view theMon_point_file=/tmp/mon_mysql_slow.point # Specify the path to the MySQL slow log monitoring pointDiff_mon_file=/tmp/mon_mysql_slow.log # Specifies the
Nagios Add a custom monitoring project++++++++++++++++++++++++++++++++++++++++++++++++++++++++++System Environment: CentOS Linux release 7.2.1511 (Core)Nagios Version: 2.15Here with the Pt-dead-logger plug-in, run the plug-in, there will be a deadlock in the Test.deadlocks table to write the deadlock informationThis is done by detecting if the table has increased the number of rows to send an alarm.Nagios Client Custom Script:# # #这里为了省事, directly to the database user, password, IP address to wr
Tutorial on using subqueries and scalar queries in MySQL,
MySQL subqueryA subquery uses the query result of a SELECT statement as the intermediate result for calling by another SQL statement. MySQL supports all the subquery formats and operations required by the SQL standard, and also extends the unique features.There
High decomposition difficulty: PHP queries MYSQL data and how the record set is specially displayed! MYSQL has a commodity price Statistical Table. you can use PHP to query a commodity and display it on the webpage. the query result is as follows: the difficulty is how to display the commodity by year and month! It's hard for me, so I beg for the statement! -----
PHP queries mysql and Chinese data. the same data added in different ways shows different hi. let me first talk about my situation. New to php. ---- Symptom output page, I have added lt; metacharset quot; UTF-8 quot; gt;, when I am querying mysql, added mysql_query ( quot; setcharactersetutf8 quot;); PHP queries
Python3 + mysql queries data and sends emails to the group via excel attachments and python3 emails to the group
This example shares the code of the python3 mass mailing excel attachment for your reference. The details are as follows:
Connect to and query mysql, import it to an excel file, and send emails and attachments in a regular group.Pymysql, smtplib, and x
Importance of indexes in mysql connection queries
In mysql, connection queries are often used to read data from multiple tables. Connection query uses the fields in the two tables that match the connection relationship to establish the association between the two tables, including the inner join, left Outer Join, right
Importance of indexes in mysql connection queries
In mysql, connection queries are often used to read data from multiple tables. Connection query uses the fields in the two tables that match the connection relationship to establish the association between the two tables, including the inner join, left Outer Join, right
The following articles mainly describe general stored procedures to perform correct operations on MySQL paging queries, if you are interested in performing the correct operations on the MySQL paging query, you can click the following article to view it. I hope you will find some benefits after browsing. Some time ago, I did not provide a general-purpose storage s
contain duplicate values (primary key and unique index), 1 means yes, key_name-index name, and the order of the columns in the seq_in_index-index, starting with 1 ; column_name-column name; collation-a or null,a indicates that the index is ordered ascending, null is not sorted, and the number of unique values in the cardinality-index; sub_part-if the entire column is indexed, the value is null. Otherwise, the size of the index is expressed as a character, packed-is packaged, and null-if the col
In MySQL, connection queries are often used to read data from multiple tables. The connection query uses the fields that match the connection relationship between the two tables to establish the association between the two tables.
In MySQL, connection queries are often used to read data from multiple tables. The connec
(Switch) add, delete, modify, query, and view log records in MySql, and mysql log records
Reprint address: http://blog.51cto.com/hades02/1641652
First, enter show global variables like '% general %' in the command line, and then the following window appears. The general_log field is the switch, which is usually OFF by default, so monitoring is not enabled yet, then general_log file
To
Monitor MySQL Master/Slave synchronization latency
There are usually two ways to monitor the latency between MySQL master and slave: Seconds_Behind_Master and mk-heartbeat.
Method 1: monitor the value of the Seconds_Behind_Master parameter output by the show slave status \ G
Scripts to monitor long transactions#!/bin/bashMysql-n-uroot-p ' password '-e ' select Now (), (Unix_timestamp (now ())-Unix_timestamp (a.trx_started)) Diff_sec,b.id,b.user, B.host,b.db,d.sql_text from Information_schema.innodb_trx a inner joinInformation_schema. Processlist bOn a.trx_mysql_thread_id=b.id and B.command = ' Sleep 'INNER JOIN performance_schema.threads c on b.id = c.processlist_idINNER JOIN performance_schema.events_statements_current D
Use useindex to optimize SQL queries
Let's take a look at the table structure of arena_match_index. pay attention to the index structure of the table.Create table 'Arena _ match_index '('Tid' int (10) unsigned not null default '0 ','Mid 'Int (10) unsigned not null default '0 ','Group' int (10) unsigned not null default '0 ','Round 'tinyint (3) unsigned not null default '0 ','Day' date not null default '2017-00-00 ','Begintime' datetime not null defaul
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