other ways to build apps

... was changed to y, has reverted to l AUTOCOMMIT The use of the AUTOCOMMIT statement is another way to work with transactions rather than the more traditional START TRANSACTION or BEGIN To a transactional ... from one partition to another takes time to copy the file from one partition to another and then delete the original file ■ There are security considerations for giving a directory its own partition ... production Two other characteristics of file systems that are important to database administrators is the ability to work with large file sizes and to provide support for a large number of directories...

Ngày tải lên: 21/01/2014, 22:20

... the adjust-monitor-adjust cycle, and once your system is at the right level, continue to monitor levels, making sure to check performance once every month or two Make sure to always leave a buffer ... MySQL Server allows a storage engine to be able to create or drop indexes without copying the contents of the entire table However, a storage engine has to write the code to implement this functionality ... Split-Merge on www.verypdf.com to remove this watermark Storage Engines for every situation Using multiple storage engines allows you to fit the storage engine to the requirements of any particular...

Ngày tải lên: 21/01/2014, 22:20

... the today field) and the total count of visitors up to today (in the vcount field) With each new visitor, update the visitors_today.count field: UPDATE visitors_today SET today = today + 1; To retrieve ... Calculates and stores the total running count in visitors_today.vcount ■ Resets the vistors_today.today field to zero Here is a sample event that updates the current and historic visitor count tables: ... INTO visitors_stored (vcount, vcount_date) SELECT today, CURRENT_DATE() - INTERVAL DAY FROM visitors_today; UPDATE visitors_today set today=0, vcount=( SELECT SUM(vcount) as vcount FROM visitors_stored);...

Ngày tải lên: 21/01/2014, 22:20

... either stop-datetime=’YYYY-MM-DD’ or stop-position=# To determine the exact position to start or stop you have to examine the binary log contents The problem is that this can be a large file To start ... very easy to pipe the output to a file and then store the file in a version control system or use just simply copy it to another server and use the file to set up the same permissions on another server ... servers to host similar types of data For example, customers with IDs less than 500,000 are stored in the customers table on server1, and customers with IDs greater than or equal to 500,000 are stored...

Ngày tải lên: 21/01/2014, 22:20

... slave to be a new master and want to change other slaves to stop replicating the old master and start replicating the new master (see Chapter 22 for examples of slave promotion) To this, log in to ... to be a slave of another master This allows you to build some fairly complicated replication topologies MySQL replication is asynchronous This means that the master does not wait for slaves to ... # Server A auto_incremenent_increment = 10 auto_increment_offset = # Server B auto_incremenent_increment = 10 auto_increment_offset = # Server C auto_incremenent_increment = 10 auto_increment_offset...

Ngày tải lên: 21/01/2014, 22:20

... tool can take into consideration the specifics of your system, and what is acceptable to your users There is a tradeoff to using automated tools, which may be acceptable Even if you use an automated ... need to update many indexes, table fragmentation, and statistics calculation Other Query Analysis Tools While EXPLAIN is the most widely used tool to analyze queries, it is not comprehensive Other ... necessary to wait for the dirty pages to be flushed This number should be low when compared to the total read numbers InnoDB Lock Waits 0/s Current Time acquiring Total ms...

Ngày tải lên: 21/01/2014, 22:20

... users are expected to seeing up -to- the-second current results, so try to train your customers to expect recent, but not necessarily up -to- the-second, results If there is resistance to changing user ... needs to back up; however, there is no need for a backup user to be able to bulk load data or execute stored routines related to the application A monitoring application that only needs to connect ... different ways to store SQL code Events, views, stored routines, and triggers can be used to allow very specific actions to be taken without giving more granular permissions For example, using a stored...

Ngày tải lên: 21/01/2014, 22:20