Re: mysqldump: Got error: 1: Can't create/write to file 'dumpdir/tablename.txt'
I wanted to respond with what I found: APPARMOR blocks mysql from writing to any other directory than the data dir and /tmp. I had to edit the /etc/apparmor.d/usr.sbin.mysqld file and add the following: /backups/mysql** rwk, to the bottom. Hope this helps someone. Ray -- MySQL General Mailing List For list archives: http://lists.mysql.com/mysql To unsubscribe:http://lists.mysql.com/mysql?unsub=arch...@jab.org
Re: Are equi-joins faster than left joins?
IIRC it does not matter. But you can double-check my opinion with EXPLAIN. A. On Thu, Mar 12, 2009 at 11:41 AM, mos mo...@fastmail.fm wrote: I have 3 tables that are 1:1 and will always have a row for a given product,_code date. If I want to join them together, is it going to be faster to use an equi join or a left join, or does it matter? TIA Mike
Problem compiling mysql-5.1.33
make all-am Making all in mysql-test Making all in lib/My/SafeProcess g++ -DHAVE_CONFIG_H -I. -I../../../../include -O3 -fno-implicit-templates -fno-exceptions -fno-rtti -MT safe_process.o -MD -MP -MF .deps/safe_process.Tpo -c -o safe_process.o safe_process.cc In file included from safe_process.cc:48: /usr/include/sys/resource.h:63: field `ru_utime' has incomplete type /usr/include/sys/resource.h:64: field `ru_stime' has incomplete type why is this taking place? Compile options ./configure --prefix=/usr/contrib --localstatedir=/usr/contrib/mysqld --without-innodb --disable-debug --with-ssl=/usr/contrib --enable-thread-safe-client -- This message has been scanned for viruses and dangerous content by MailScanner, and is believed to be clean. -- MySQL General Mailing List For list archives: http://lists.mysql.com/mysql To unsubscribe:http://lists.mysql.com/mysql?unsub=arch...@jab.org
Re: Are equi-joins faster than left joins?
On Thu, Mar 12, 2009 at 8:41 AM, mos mo...@fastmail.fm wrote: I have 3 tables that are 1:1 and will always have a row for a given product,_code date. If I want to join them together, is it going to be faster to use an equi join or a left join, or does it matter? IIRC:With an inner join the optimizer has more latitude to reorganize the join order and can short circuit the process if there is not a corresponding row. This is completely secondary to getting the right result set for your query. If there is the possibility of a row in the parent table not joining and needing to be part of the result then you must use left. -- Rob Wultsch wult...@gmail.com -- MySQL General Mailing List For list archives: http://lists.mysql.com/mysql To unsubscribe:http://lists.mysql.com/mysql?unsub=arch...@jab.org
