mysql innodb

Some time ago, I got a special business. Its scenario is as follows:-About 0.3 billion of data is written into the database every day-write more and read less, write 10 million data every 5 minutes-by the talent table, data on the same day of

InnoDB Lock ProblemsThere are two major differences between InnoDB and MyISAM: transaction support and row-Level Lock. There are many differences between Row-level locks and table-level locks. In addition, the introduction of transactions also

1.1.Log & Checkpoint InnodbThe transaction log of isRedo log, AbbreviationLog,Save in Log FileIb_logfile *. Innodb also has another log Undo log, but the Undo log is stored in the shared tablespace (ibdata * file

Case DescriptionDuring the running of the scheduled script, it is found that when the SQL statement for backing up the table and the SQL statement for deleting some data in the table run simultaneously, mysql will detect the deadlock and print the

The innodb engine is different from myisam in terms of statistics. Myisam has a built-in counter. Therefore, when using select count (*) from table, you can directly retrieve data from the counter. Innodb must scan the entire table once to obtain

MyISAM is the default storage engine in MySQL. Generally, not many people care about this. It is a tricky thing to decide what kind of storage engine to use, but let's take a look at it.ArticleOnly MyISAM and InnoDB are considered, because these two

Use the so-called next-key locking in the InnoDB row lock. This means that in addition to index records, InnoDB can also lock the front "gap" (& apos; Gap & apos;) of the index records ;) to block the direct insertion of other users in front of the

Official accurate explanation · MyISAM: the default MySQL plug-in storage engine, which is one of the most commonly used storage engines in Web, data warehousing, and other application environments. Note: by changing the storage_engine

The example is as follows: When I used show InnoDB status to check the engine status, I found a deadlock problem: * ** (1) transaction: Transaction 0 677833455, active 0 sec, process no 11393, OS thread ID 278546 starting index read MySQL

First understand what is gap lock In InnoDB, there are roughly three types of record-level locks: Record, Gap, and next-keylocks. Simply put, recordlock is to lock a row of records; while gaplock locks records in a range; NEXT-KEYLOCK is the effect

1. MySQL is a single-process multi-thread Architecture 2. view the engines supported by the current database Show engines \ G; 3 InnoDB has 7 Background threads, 4 Io threads, 1 master thread, 1 lock, and 1 error monitoring thread.Show engine

The following statement appears: The ' InnoDB ' feature is disabled; You are need MySQL built with ' InnoDB ' to have it working; is the MySQL tutorial configuration file banned this option!To close the MySQL database tutorialLocate the My.ini file

Case descriptionDuring a timed script run, it is found that when the SQL statement of the backup table runs concurrently with the SQL statement that deletes the data in the table, MySQL detects the deadlock and prints out the log.Two SQL statements

The InnoDB engine is different in statistics and MyISAM, and MyISAM has a built-in counter, so when you use the Select COUNT (*) from table, you can directly retrieve data from the counter. And InnoDB must be scanned all the time to get the total

InnoDB when writing intensive pressure, due to b-tree extension, it will also bring the expansion of data files, however, InnoDB data file extensions need to use a mutex to protect the data files, which can cause fluctuations. Ding's blog explains

First, InnoDB row lock classification Record lock: Records locks, which is just a single line locked Gap Lock: An interval lock that only locks an interval (note that the interval here is open, i.e. excluding boundary values.) Next-key Lock:record

InnoDB is a transaction-safe storage engine designed to draw on many Oracle architecture ideas, and in general, in OLTP applications, InnoDB should be the first storage engine for the core application table. InnoDB was developed by a third party

InnoDB, like most line databases, records stored in row format, which provides two formats: compact and redundant Compact The compact format is introduced in MySQL5.0, a new line format designed to efficiently store data, as shown in the following

Today we introduce the second feature of the InnoDB storage Engine-two writes (Doublewrite), and if the insertion buffer is to improve write performance, then two writes are to improve reliability, sacrificing a bit of write performance. Partial

· If the top tool for UNIX or Windows Task Manager shows that the CPU usage of your database workload is less than 70%, your workload may be disk bound, you may be generating too many transactions and submissions, or the buffer pool is too small.