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Label: Block Nested-loop and batched Key Access Joins The batched Key access (BKA) join algorithm accesses the joined table through index and join buffer, and the BKA algorithm supports inner Join,outer join and semi join operations, including nested outer joins, The benefits of BKA include increased join performance (due to a more efficient table scan), and the

. table_name = upper (' table_name ');/* Delete the chained/migrated rows from the original table */Delete from table_nameWhere rowid in (select head_rowid from chained_rows );/* Copy the chained/migrated rows back into the original table */Insert into table_name select * From migrated_rows;Spool offWhen using this script, you must remove the foreign key constraints involved. 7. Index Reorganization Creating an index on an unstable table will aff

Key Points of Block usageIntroduction to Block The Block actually contains two parts. Block location in memory There are three types of Block in memory: NSGlobalBlock, NSStackBlock, and NSMallocBlock. NSGlobalBlock: similar to a

For people who have used windows, few people are unaware of the Ctrl+alt+del key combination, especially when using a windows9x that often freezes, and this key combination is an emergency exit specifically for system security. VC Knowledge Base Online magazine 11th, Ac952_z_cn wrote an article on this in his personal column: "How to block Ctrl+alt+del under WIND

On Windows XPBlock the CTRL + ALT + DEL, ALT + tab, and CTRL + ESC key sequences Compile/northtibet Keywords: CTRL + ALT + DEL, ALT + TAB, CTRL + ESC, vk_lwin, vk_rwin, task bar, task manager, taskbar, and task manager. Download this articleSource code: Trapkeys.zip (95kb) For those who have used Windows, almost no one knows the CTRL + ALT + DEL key combination, especially when Windows 9x, which oft

the reason, but the configuration on the server will be cached !) --------------------------------------------------------------------------------6. sharding cluster data insertion test (incremental partition Key Mode)Use admindb. runcommand ({shardcollection: "mydb. users ", key: {_ ID: 1}) Use mydb to insert 0.6 million data records for (VAR I = 1; I Therefore, the mongos route performs load balancing on

I haven't touched the underlying details of the database for a long time. A little guy came to me a few days ago and had to say that the compound B * tree index branch block only contains the key value information of the pilot column, it does not contain the key value information of the non-pilot column, and also dump the branch

modification of chunks block or modification of the chip key)PS: the admin database of the entire cluster is stored in config sever, and the three config servers not only synchronize the Database Config, but also synchronize the database admin.--------------------------------------------------------------------------------2. Start route process, route process: 50000/Apps/Mongo/bin/mongos -- Port 50000 -- c

associated with the B1 in one-time to the index of the T2 Matches, and then returns the matching key sorted by primary key by MRR, thereby reducing the random I/O generated when the table is returned. The size of the join_buffer_size determines the size of the key that Bak submits to MRR each time the batch is processed, Appropriately increasing the size of join

Recently, we have been studying the function of a video lock, that is, setting a lock on the video playback interface. When the lock becomes effective, it will shield back, home, menu. Both the back and menu keys can be intercepted through the onKeyDown and onKeyUp functions at the app layer. But the home key does not work. So I checked the method of shielding the home key on the app layer. The mainstream m

Processdata:falseThis is a parameter of Jquery.ajax. The default value is true, which means that non-string objects are automatically converted to K1=v1k2=v2 form, such as an array parameter {d:[1,2]}, which becomes d[]=1d[]=2 after the server.To set it to false to upload the Arraybuffer object, the server gets the raw byte stream directly from the Request.inputstream.W3school Explanation:true " application/x-www-form-urlencoded " false.Main code: (the following code is called in the Readasarray

Compiled a JS Code for operating the browser for your own search, suitable for beginners to learn, and compatible with browsers such as IE and ff. // Copyright 2012 yundaoinfo www.xmwebs.com // Author: badsun// Date:Document. onkeydown = function (event) {var E = Window. event | event; If (E. altkey (E. keycode = 37) | // block Alt + direction key trim (E. keycode = 39) {//

The popwindow is blocked by the meizu virtual key, and the popwindow virtual block In the previous project, we made a sharing function, called a third party of umeng, and the function was perfectly implemented and shared. However, during the test, I shared the pop-up popwindow with the meizu X4 mobile phone and was blocked by the virtual key of the mobile phone.

We know that Oracle automatically indexes the primary key columns of the table, and this default index is the normal B-tree index. The default B-tree index is not ideal for situations in which primary key values are added sequentially (incremental or descending). This is because if the value of the indexed column is in strict order, the hierarchy of the index tree grows quickly as the data row is inserted.

Long time do not touch the database of the bottom details of things, a few days ago, a little guy came to me, not to say compound B*tree Index branch block contains only the pilot column key information, does not contain non-pilot column key value information, but also dump the branch block, to prove his statement, Fro