sunset lock and key

Tags: operation unique index nod implementation action hit principle BSP MySQL Lock process detailed (1)-Basics MySQL plus lock process details (2)-about MySQL read comprehension MySQL plus lock process details (3)-about MySQL read comprehension MySQL Lock process detailed (4)-select for Update/

Tags: Erro index ICA INNODB structure err 0.00 MoD Set1. Table structure CREATE TABLE `t3` ( `id` int(11) NOT NULL, `id2` int(11) DEFAULT NULL, `id3` int(11) DEFAULT NULL, PRIMARY KEY (`id`), UNIQUE KEY `id2` (`id2`,`id3`) ) ENGINE=InnoDB DEFAULT CHARSET=utf8; 2. Data mysql> select *from t3; +----+------+------+ | id | id2 | id3 | +----+------+------+ | 6 | 1 | 1 | |

Record LockA single index record is locked, the record lock is always indexed, not the records themselves, even if there is no index on the table, then InnoDB creates a hidden clustered primary key index in the background, so the hidden clustered primary key index is locked. So when an SQL does not take any indexes, it will add an X

About innodb locks (record, gap, Next-Key lock) and innodbnext-key Record lock locks a single index record. Record lock always locks the index instead of the record itself, even if the table does not have any indexes, then innodb will create a hidden clustered primary

When InnoDB determines whether a row lock is in conflict, in addition to the most basic is/ix/s/x lock collision judgment, InnoDB also subdivides the lock into the following seed types: Record Lock (RK)Record locks, lock only one row of index records Gap

Win7 System computer keyboard SCROLL LOCK SCROLL LOCK key how to use? The specific methods are as follows: 1, first scroll LOCK button in the upper right of the computer; 2, Scroll lock button name called ' Lock ro

Test steps"Test version number" T0606"Module Version number"Navi Lock Screen: 5.0.0.ck"Test Steps"1, manually press the Power key to lock,"Test Results"No lock screen beep, unable to restore "single machine must be present""Expected results"There's a beep."Number of occurrences"Single machine must be presentFrom log ca

Test steps"Beta version" T0606"Module Version"Navi Lock Screen: 5.0.0.ck"Test Steps"1, manually press the Power key to lock,"Test Results"No lock screen beep, unable to restore "single machine must be present""Expected results"There's a beep."Number of occurrences"Single machine must be presentFrom log can be found4321

Phenomenon:HP Notebook Press the Power on key after the lights, but the screen is always black, only the CAPS LOCK key flashes, flash 3 times a cycle, listen to the fan rotation sound, hot air, CPU should also be working, ask what is the problem.Solve (I follow the red to do it, it is really strange ...) ):Hello, thank you for choosing HP products.1, your noteboo

mac third-party input method How to change the CAPS LOCK key to the Input method switch key According to my personal habits, I finally decided to change the CAPS LOCK key to the Input method switch key, because as a C

On the android unlock page, plug in USB to open the USB storage settings page. Press the HOME Key/Return key to directly return to launcher, instead of sliding the screen lock page.1) If you disable setting -- developer options -- USB debugging disable, it indicates that the current user mode is used, and USB is inserted under the screen

Tags: find replace isolation DUP warning docs get mod defaultGap Lock's internal locking principle gap Lock's front conditions:1 transaction ISOLATION level is Repeatable-read,innodb_locks_unsafe_for_binlog parameter is 0, and SQL Walk index is non-unique index 2 The Transaction isolation level is the Repeatable-read,innodb_locks_unsafe_for_binlog parameter of 0, and SQL is the current read operation of a range, and if not a non-unique index adds Gap lock