database.yml in Rails reconnect set to true or false -

-

in database.yml, default settings reconnect on rails 3 , 4 false. common setting, , in circumstances should set true? thanks.

you can set true. option introduced in rails 2.3

mysql supports reconnect flag in connections - if set true, client try reconnecting server before giving in case of lost connection. can set reconnect = true mysql connections in database.yml behavior rails application.

rails team set option default 'false' because, don't want change behavior of existing applications.

but side effects there if set reconnect = true. not transaction-safe.the mysql documentation in fact explicitly states auto-reconnect feature affects transactions.

any active transactions rolled , autocommit mode reset.

applications not written deal break. documentation lists number of other side effects caused auto-reconnect feature, of cause applications not written anticipate behavior function incorrectly or fail.

check:

rails 2.3 release notes

mysql-reconnect-value-doesnt-stick

see stackoverflow qn


Comments

Post a Comment

Popular posts from this blog

python - Subclassed QStyledItemDelegate ignores Stylesheet -

-
i'm trying subclass qstyleditemdelegate remove focus rectangle in qcombobox . even though i'm calling base implementation of paint function , nothing else, result different. looks if parts of style-sheet influence bounding box of item taken consideration. class pstyleditemdelegate(qstyleditemdelegate): def __init__(self, *args, **kwds): super(pstyleditemdelegate, self).__init__(*args, **kwds) def paint(self, *args, **kwargs): qstyleditemdelegate.paint(*args, **kwargs) what have paint unmodified qstyleditemdelegate ? as suggested tried replacing pyside pyqt4 , works, appears bug. update pyside 1.1.2 1.2.1 result same. unfortunately switch breaks other parts of code, if there no other suggestions i'm going accept answer. edit bug tracked here
Read more

java - HttpClient 3.1 Connection pooling vs HttpClient 4.3.2 -

-
i have used httpclient3.1(java) connection pooling below : import org.apache.commons.httpclient.httpclient; import org.apache.commons.httpclient.multithreadedhttpconnectionmanager; import org.apache.commons.httpclient.params.httpclientparams; import org.apache.commons.httpclient.params.httpmethodparams; import org.apache.log4j.logger; public class httpclientmanager { private static logger logger = logger.getlogger(httpclientmanager.class); private static multithreadedhttpconnectionmanager connectionmanager = new multithreadedhttpconnectionmanager(); private static httpclientparams clientparams = new httpclientparams(); static { try { clientparams.makelenient(); clientparams.setauthenticationpreemptive(false); clientparams.setparameter(httpmethodparams.so_timeout, new integer(30000)); // set so_timeout clientparams.setparameter(httpmethodparams.head_body_check_timeout, new integer(3000)); // head responses
Read more

SQL: Divide the sum of values in one table with the count of rows in another -

-
is possible to, in single query, sum bunch of values in 1 table, , divide count of rows in another? there common id/key in both tables... fyi, win points least info provided in question. answer it's possible...here psuedo code since i'm guessing @ tables , columns select summing / counting whynot (select id, sum(whatever) summing where_ever ) inner join (select id, count(1) counting what_ever)b on a.id = b.id question = 'vague' group a.id
Read more