What is the best mysql table format for high insert load? -

-

I'm in the process of adding a new feature to a system. The process will teach live data from the PLC and store them in the database. The data table will contain 4 columns: variable_id (SMALLINT), timestamp (timestamp), value (flow), quality (TINIINT). Is the primary key (variable_id, timestamp).

The system should be able to insert 1000-2000 records per second.

The data table will retain data from the past 24 hours, old data is removed from the table.

The data table also needs to handle every other 5-10 selection details. Selecting the latest value from the selection statement table for a specific variable and displaying it on the web.

Should I use the MySam or InDebbi table format? Does the mismatch lock the whole table while inserts, thus blocking the selected statements from the web interface? Currently, all data tables in the data base are MyISAM tables.

Should I use MySam or InnoDB table format?

For any project that you read frequently and concurrently, you should use the InnoDB .

By including MyISAM lock, can the entire table block the selected statements from the web interface?

with @@ concurrent_insert , MyISAM while the rows inserted at the end while reading concurrently from the second session Add.

However, if you ever do anything on INSERT , then it may fail (i.e. the table will be locked).

The system should be able to insert 1000-2000 records per second.

It would be better to batch these inserts and make them in batches.

Inodi is very fast in terms of lines per second compared to the trans.

The data table will retain data in the last 24 hours, old data from the table will be deleted.

Note that InnoDB examines all the rows, not only those are affected.

If your delete statement will ever use a fullscall, the concurrent INSERTs fail (because the full span InnoDB is the last spacing Including the difference lock on all the browsed browsing records).


Comments

Post a Comment

Popular posts from this blog

MySql variables and php -

-
I am getting an error with php in order to format mysql_query () in php to format this string What is the right way? SELECT SELECT SELECT (*) Agents @AgentCount; User_Agent_English, User_Angent_Oursal, US.___Gent_Aginal, COUNT (User_Agent_Percade) ACC, COUNT (*) / (AgentCount) Percentage by agents user_agent_preser order DEC limit limit 50; In PHP, how am i setting $ query $ query = "SELECT count (*) agents @ agentcount; SELECT user_agent_parsed, User_agent_original , COUNT (user_agent_parsed) ascount, COUNT (*) / (@AgentCount) as a percentage by user_agent_parced by URI date DESC limit 50 "; This exact query will work properly if I put it in MySQL directly through a command line session. Do I need to release two separate php calls from mysql_query () and store the results first? I get the following error: There is an error in your SQL syntax; Instead of using a sub-selection and instead of using the 'SELECT user_agent_parsed, user_agent_original, ne...
Read more

url rewriting - How to implement the returnurl like SO in PHP? -

-
This URL should work even after the rewrite. Is this possible? Otherwise, I can only hardcoded everything If you are trying to create a login system with redirection You need to use the HTTP_REFERER header to find out where the user came from so that you can send it back there. The best way to do this is to use something like this in your login form: // - Login php & Lt; Input type = "password" name = "password" /> & Lt; Input type = "hidden" name = "returnrelale" value = "& lt ;? php echo $ redirectURL ;? & gt;" / & Gt; & Lt; / Form & gt; Please note that some ISP, browser or proxy will delete the referrer header, so you can not rely on each user to work fully. If you use a statement, to check whether the header exists or not, you can send those users back to the homepage or whatever. Edit If you are looking to use $ _SERVER ['REQUEST_URI'], if you are running Apache It sho...
Read more

Which Python client library should I use for CouchdB? -

-
I am starting to experiment with CouchDB because it looks like we have the right solution to certain problems That all the work will be on a new project, which does not have any legacy dependency, which the client library will suggest you use, and why? If we overlap any of the OS. Freeband is available only in the collection of its ports, but asks to use the library's project website. None of those people are Ubuntu, which is only with ships, since those two OSAs are not common in libraries, I am probably installing something from source (and hopefully if I have time, then Ubuntu and FreeBSD People pack the package). For those interests, I want to use CouchDB as a convenient intermediate storage space for data passed between different services - think of a message bus system, but less formalities with. For example, we have daemons that download and pars the web page, then send an interesting bit to other daemons for further processing. Many of them are ill-defined until the...
Read more