ok. let me try TRANSACTION_READ_UNCOMMITTED and check locks ... Ejaz
-----Original Message----- From: Jeff Butler [mailto:jeffgbut...@gmail.com] Sent: Wednesday, April 14, 2010 11:55 AM To: user-java@ibatis.apache.org Subject: Re: Locks iBATIS always starts a transaction. If you want to avoid transactions completely, you will need to implement your own version of a transaction manager - you can base it on the EXTERNAL transaction manager. Jeff Butler On Wed, Apr 14, 2010 at 11:43 AM, Ejaz X Mohammed <ejaz.moham...@jpmorgan.com> wrote: > I changed the code to use plain jdbc instead of ibatis ... as I said I'm > doing just SELECT ... I started no tranasaction .. now I don't see any locks, > perf seems to be better too ... > > If we start a transaction, sybase takes locks ... read lock for SELECT ... > > Can we avoid starting TX during select in ibatis? > > Ejaz > > > -----Original Message----- > From: Jeff Butler [mailto:jeffgbut...@gmail.com] > Sent: Wednesday, April 14, 2010 11:36 AM > To: user-java@ibatis.apache.org > Subject: Re: Locks > > I assume you're using SIMPLE datasource. With that data source, the > isolation level is set as a driver default. I just did a quick test > with HSQLDB and the default seems to be TRANSACTION_READ_COMMITTED - a > middle of the road isolation level. Maybe there is some setting on > the Sybase driver that will allow you to change the default isolation > level? > > Alternatively, you can do it in code like this: > > try { > sqlMapClient.startTransaction(Connection.TRANSACTION_READ_UNCOMMITTED); > > -- do some work > } finally { > sqlMapClient.endTransaction(); > } > > If you are using some other datasource (like JNDI), then you'll need > to look to that datasource for information about changing the > isolation level. > > Jeff Butler > > > > > > On Wed, Apr 14, 2010 at 9:51 AM, Ejaz X Mohammed > <ejaz.moham...@jpmorgan.com> wrote: >> These are my settings ... >> >> <!-- >> These settings control SqlMap configuration details, primarily to do with >> transaction >> management. They are all optional (see the Developer Guide for more). >> --> >> <settings >> cacheModelsEnabled="true" >> enhancementEnabled="true" >> lazyLoadingEnabled="true" >> maxRequests="32" >> maxSessions="10" >> maxTransactions="5" >> useStatementNamespaces="true" >> /> >> >> <!-- >> Configure a datasource to use with this SQL Map using SimpleDataSource. >> Notice the use of the properties from the above resource >> --> >> <transactionManager type="JDBC" > >> <dataSource type="...."> >> <property name="JDBC.Driver" value="${jdbc.driver}"/> >> <property name="JDBC.ConnectionURL" value="${jdbc.url}"/> >> <property name="JDBC.Username" value="${jdbc.user}"/> >> <property name="JDBC.Password" value="${jdbc.password}"/> >> <property name="JDBC.DefaultAutoCommit" value="true"/> >> </dataSource> >> </transactionManager> >> >> >> >> >> -----Original Message----- >> From: Jeff Butler [mailto:jeffgbut...@gmail.com] >> Sent: Wednesday, April 14, 2010 9:44 AM >> To: user-java@ibatis.apache.org >> Subject: Re: Locks >> >> It's dependent on the transaction isolation level set on your >> connection. There are many variables involved - what is your >> environment (POOLED, UNPOOLED, JNDI, etc.)? >> >> Jeff Butler >> >> >> On Wed, Apr 14, 2010 at 9:38 AM, Ejaz X Mohammed >> <ejaz.moham...@jpmorgan.com> wrote: >>> Hello, >>> >>> >>> >>> I have an application running on Sybase. DBAs tell me that it is generating >>> too many locks ... I know that all I'm doing is SELECT. >>> >>> >>> >>> I'm not sure how SELECT can create locks in database. >>> >>> >>> >>> Any suggestions ? >>> >>> >>> >>> Thanks >>> >>> Ejaz >>> >>> This email is confidential and subject to important disclaimers and >>> conditions including on offers for the purchase or sale of securities, >>> accuracy and completeness of information, viruses, confidentiality, legal >>> privilege, and legal entity disclaimers, available at >>> http://www.jpmorgan.com/pages/disclosures/email. >> >> --------------------------------------------------------------------- >> To unsubscribe, e-mail: user-java-unsubscr...@ibatis.apache.org >> For additional commands, e-mail: user-java-h...@ibatis.apache.org >> <p><span STYLE="color :#000000;background-color :#FFFFFF"> >> This email is confidential and subject to important disclaimers and >> conditions including on offers for the purchase or sale of securities, >> accuracy and completeness of information, viruses, confidentiality, legal >> privilege, and legal entity disclaimers, available at >> http://www.jpmorgan.com/pages/disclosures/email. >> </span></p> >> >> --------------------------------------------------------------------- >> To unsubscribe, e-mail: user-java-unsubscr...@ibatis.apache.org >> For additional commands, e-mail: user-java-h...@ibatis.apache.org >> >> > > --------------------------------------------------------------------- > To unsubscribe, e-mail: user-java-unsubscr...@ibatis.apache.org > For additional commands, e-mail: user-java-h...@ibatis.apache.org > > This email is confidential and subject to important disclaimers and > conditions including on offers for the purchase or sale of > securities, accuracy and completeness of information, viruses, > confidentiality, legal privilege, and legal entity disclaimers, > available at http://www.jpmorgan.com/pages/disclosures/email. > > --------------------------------------------------------------------- > To unsubscribe, e-mail: user-java-unsubscr...@ibatis.apache.org > For additional commands, e-mail: user-java-h...@ibatis.apache.org > > --------------------------------------------------------------------- To unsubscribe, e-mail: user-java-unsubscr...@ibatis.apache.org For additional commands, e-mail: user-java-h...@ibatis.apache.org This email is confidential and subject to important disclaimers and conditions including on offers for the purchase or sale of securities, accuracy and completeness of information, viruses, confidentiality, legal privilege, and legal entity disclaimers, available at http://www.jpmorgan.com/pages/disclosures/email. --------------------------------------------------------------------- To unsubscribe, e-mail: user-java-unsubscr...@ibatis.apache.org For additional commands, e-mail: user-java-h...@ibatis.apache.org
