addition mysql

Operating system is CENTOS7 641, modify the/ETC/MY.CNF, add a line under the [mysqld] subsection: Skip-grant-tables=1This line of configuration allows mysqld to be not validated at startup2. Restart MYSQLD service: systemctl restart Mysqld3. Log in

1. Select the most applicable field propertiesMySQL is good at supporting large data volumes, but in general, the smaller the tables in the database, the faster queries are executed on it. Therefore, in order to achieve better performance when

MySQL Benefits:Easy to use, low cost, easy to expand, replication leadingThe life cycle of MySQL:MySQL server listener 3306 port > Authenticate Access user > create MySQL thread > Check memory (qcache) > Parse sql> generate query plan > Open Table >

1, decompression mysql-5.7.11 compression package to the disk folder you want to store;2. Create a new Data folder in the folder and create a new My.ini file, and configure the My.ini file My.ini file contents: Key points for configuring

注:此文复制而来,只为便于学习!1. Select the most applicable field propertiesMySQL is good at supporting large data volumes, but in general, the smaller the tables in the database, the faster queries are executed on it. Therefore, in order to achieve better

From_unixtime () is the time function in MySQLDate is the parameter that needs to be processed (the parameter is a UNIX timestamp), can be a field name, or it can be a Unix timestamp stringThe following '%y%m%d ' is primarily the formatting of the

MySQL is the most widely used database server in the Web world. SQLite is characterized by its lightweight, embeddable, but not highly concurrent access, for desktop and mobile applications. MySQL is designed for server-side database, can withstand

Recently interviewed by the interviewer often asked about the database knowledge, so summed up the interviewer asked questions have been gradually understanding of the database1, before the Baidu interview officer asked me a special basis of SQL

Localtimestamp () LocaltimestampThese date-time functions are equivalent to now (). Since the now () function is short and easy to remember, it is recommended that you always use now () instead of the functions listed above.1.2 Get the current date +

Ii. Summary of PrinciplesPrinciple 1, only lists the fields that need to be queried, which has no noticeable effect on speed, mainly considering saving the memory of the application server.Original statement: SELECT * from adminOptimized to: Select

Read/write Lock:. Table-level Lock: Low overhead, lock fast, no deadlock, lock granularity, lock conflict is the highest probability, concurrency is the lowest. Row-level locks: high overhead, slow locking, deadlock, minimum lock

background:One of their own site, because the single-table data record up to 1 million, resulting in slow data access, the background of Google Analytics often report timeouts, especially pages with large page is slow.test Environment:First let's

MySQL Date TypeMySQL Date Type: Date format, occupied storage space, date range comparison.Date type storage space Date format date range------------  ---------   --------------------- -----------------------------------------DateTime 8 bytes

1.1 Get the current date + time (date + times) function: Now ()In addition to the now () function to get the current date time, MySQL has the following functionCurrent_timestamp () current_timestampLocalTime () localtimeLocaltimestamp ()

A data type is a basic rule that defines what data can be stored in a column and how that data is actually stored. MySQL's common data types include: string Data type : The most commonly used data type, there are two basic types of strings:

MySQL is now a better nosql solution. We say this because MySQL has the advantage of performance, ease of use, and stability when storing data such as key/value (Key/value). The MySQL engine is robust and well-supported by the community and the

(i) about the storage engineCreating an appropriate index is one of the most important techniques in SQL performance tuning. Before learning to create an index, learn about MySQL's architectural details, including how it is organized on the hard

1.1 Get the current date + time (date + times) function: Now ()In addition to the now () function to get the current datetime, MySQL has the following function:Current_timestamp () Current_timestampLocalTime () localtimeLocaltimestamp ()

via MySQL the UDFs and Trigger Operation MemcachedUDFs is the abbreviation for user Defined functions, which represents a mysql-defined function that the application can use to access the data memcached writes or obtains from a MySQL version of 5.0

I tried to use memcache before. Later I found that memcached supports the setMulti method and is ready to switch to the memcached library. (I tried it. In fact, memcache supports multi-value set, but it does not exist in the document. It seems that