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• How to validate selects / inserts are hitting the right server with MySQL Master/Slave

  - by bwizzy

  I've got a rails app using the master_slave_adapter plugin (http://github.com/mauricio/master_slave_adapter/tree/master) to send all selects to a slave, and all other statements to the master. Replication is setup using Mysql master / slave. I'm trying to validate that all the SQL statements are indeed going to the right place. Selects to the slave (db2), inserts to the master (db1) but I'm not sure how to do it. I've tried using tcpdump on the webservers: sudo /usr/sbin/tcpdump -q -i eth0 dst port 3306 and this is the output for a page request with a ton of selects: 10:32:36.570930 IP web2.mydomain.com.57524 > db1.mydomain.com.mysql: tcp 0 10:32:36.576805 IP web2.mydomain.com.57524 > db1.mydomain.com.mysql: tcp 0 10:32:36.577201 IP web2.mydomain.com.57524 > db1.mydomain.com.mysql: tcp 0 10:32:36.577980 IP web2.mydomain.com.57524 > db1.mydomain.com.mysql: tcp 86 10:32:36.578186 IP web2.mydomain.com.57524 > db1.mydomain.com.mysql: tcp 21 10:32:36.578359 IP web2.mydomain.com.57524 > db1.mydomain.com.mysql: tcp 27 10:32:36.578522 IP web2.mydomain.com.57524 > db1.mydomain.com.mysql: tcp 5 10:32:36.578741 IP web2.mydomain.com.57524 > db1.mydomain.com.mysql: tcp 13 10:32:36.579611 IP web2.mydomain.com.57524 > db1.mydomain.com.mysql: tcp 29 10:32:36.588201 IP web2.mydomain.com.45978 > db2.mydomain.com.mysql: tcp 0 10:32:36.588323 IP web2.mydomain.com.45978 > db2.mydomain.com.mysql: tcp 0 10:32:36.588677 IP web2.mydomain.com.45978 > db2.mydomain.com.mysql: tcp 0 10:32:36.588784 IP web2.mydomain.com.45978 > db2.mydomain.com.mysql: tcp 86 It doesn't look like all the selects are going to the slave. Maybe this isn't the right way to test, anyone know a better way?

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• Error in installing ZTE AC2738 on ubuntu 3.0.0-12-generic

  - by Netro

  I am getting this error ,struct usb_serial_driver has no member named shutdown. I am installing on 64bit ubuntu 3.0.0-12-generic ... Beginning Verify CD ... ... Verify CD Succeed! ... Beginning Copy Install Package Files ... ... will take a long time, waiting 5 seconds, please ... Copy Install Package Files Succeed! ... 'ztemtApp' previous version not found. and install now Beginning install ... ... Current linux release version is 'Ubuntu' ... Checking 'App' process ... Checking old installation ... Installing ... Current Path is : . : /tmp/ztemt_datacard/Linux 1. Checking Previous Version ... 2. Copying Data Bin ... ... will take a few seconds, please waiting ... /tmp/ztemt_datacard/Linux 3. Auto Load Usb Driver Module ... Rather than invoking init scripts through /etc/init.d, use the service(8) utility, e.g. service acpid restart Since the script you are attempting to invoke has been converted to an Upstart job, you may also use the stop(8) and then start(8) utilities, e.g. stop acpid ; start acpid. The restart(8) utility is also available. acpid stop/waiting acpid start/running, process 11802 4. Changing pppd Options ... 5. Changing File Permission ... 6. Deleting Qt lib When Local QT Vertion > V4.4.0 ... ... Package 'libqtgui4' exist ... QT_VERSION = 4 7. Deleting process id file: EVDOApp.pid ... 8. Making USB Serial Driver Module : ztemt.ko ... ... will take a few seconds, please waiting ... make -C /lib/modules/3.0.0-12-generic/build M=/usr/local/bin/ztemtApp/zteusbserial/below2.6.27 modules make[1]: Entering directory `/usr/src/linux-headers-3.0.0-12-generic' CC [M] /usr/local/bin/ztemtApp/zteusbserial/below2.6.27/usb-serial.o /usr/local/bin/ztemtApp/zteusbserial/below2.6.27/usb-serial.c: In function ‘destroy_serial’: /usr/local/bin/ztemtApp/zteusbserial/below2.6.27/usb-serial.c:159:14: error: ‘struct usb_serial_driver’ has no member named ‘shutdown’ /usr/local/bin/ztemtApp/zteusbserial/below2.6.27/usb-serial.c:165:18: error: ‘struct usb_serial_port’ has no member named ‘open_count’ /usr/local/bin/ztemtApp/zteusbserial/below2.6.27/usb-serial.c: In function ‘serial_open’: /usr/local/bin/ztemtApp/zteusbserial/below2.6.27/usb-serial.c:241:36: error: ‘struct usb_serial_port’ has no member named ‘mutex’ /usr/local/bin/ztemtApp/zteusbserial/below2.6.27/usb-serial.c:246:8: error: ‘struct usb_serial_port’ has no member named ‘open_count’ /usr/local/bin/ztemtApp/zteusbserial/below2.6.27/usb-serial.c:251:6: error: ‘struct usb_serial_port’ has no member named ‘tty’ /usr/local/bin/ztemtApp/zteusbserial/below2.6.27/usb-serial.c:253:10: error: ‘struct usb_serial_port’ has no member named ‘open_count’ /usr/local/bin/ztemtApp/zteusbserial/below2.6.27/usb-serial.c:265:3: warning: passing argument 1 of ‘serial->type->open’ from incompatible pointer type [enabled by default] /usr/local/bin/ztemtApp/zteusbserial/below2.6.27/usb-serial.c:265:3: note: expected ‘struct tty_struct *’ but argument is of type ‘struct usb_serial_port *’ /usr/local/bin/ztemtApp/zteusbserial/below2.6.27/usb-serial.c:265:3: warning: passing argument 2 of ‘serial->type->open’ from incompatible pointer type [enabled by default] /usr/local/bin/ztemtApp/zteusbserial/below2.6.27/usb-serial.c:265:3: note: expected ‘struct usb_serial_port *’ but argument is of type ‘struct file *’ /usr/local/bin/ztemtApp/zteusbserial/below2.6.27/usb-serial.c:270:20: error: ‘struct usb_serial_port’ has no member named ‘mutex’ /usr/local/bin/ztemtApp/zteusbserial/below2.6.27/usb-serial.c:276:6: error: ‘struct usb_serial_port’ has no member named ‘open_count’ /usr/local/bin/ztemtApp/zteusbserial/below2.6.27/usb-serial.c:278:6: error: ‘struct usb_serial_port’ has no member named ‘tty’ /usr/local/bin/ztemtApp/zteusbserial/below2.6.27/usb-serial.c:279:20: error: ‘struct usb_serial_port’ has no member named ‘mutex’ /usr/local/bin/ztemtApp/zteusbserial/below2.6.27/usb-serial.c: In function ‘serial_close’: /usr/local/bin/ztemtApp/zteusbserial/below2.6.27/usb-serial.c:355:18: error: ‘struct usb_serial_port’ has no member named ‘mutex’ /usr/local/bin/ztemtApp/zteusbserial/below2.6.27/usb-serial.c:357:10: error: ‘struct usb_serial_port’ has no member named ‘open_count’ /usr/local/bin/ztemtApp/zteusbserial/below2.6.27/usb-serial.c:358:21: error: ‘struct usb_serial_port’ has no member named ‘mutex’ /usr/local/bin/ztemtApp/zteusbserial/below2.6.27/usb-serial.c:371:8: error: ‘struct usb_serial_port’ has no member named ‘open_count’ /usr/local/bin/ztemtApp/zteusbserial/below2.6.27/usb-serial.c:372:10: error: ‘struct usb_serial_port’ has no member named ‘open_count’ /usr/local/bin/ztemtApp/zteusbserial/below2.6.27/usb-serial.c:375:3: error: too many arguments to function ‘port->serial->type->close’ /usr/local/bin/ztemtApp/zteusbserial/below2.6.27/usb-serial.c:377:11: error: ‘struct usb_serial_port’ has no member named ‘tty’ /usr/local/bin/ztemtApp/zteusbserial/below2.6.27/usb-serial.c:378:12: error: ‘struct usb_serial_port’ has no member named ‘tty’ /usr/local/bin/ztemtApp/zteusbserial/below2.6.27/usb-serial.c:379:9: error: ‘struct usb_serial_port’ has no member named ‘tty’ /usr/local/bin/ztemtApp/zteusbserial/below2.6.27/usb-serial.c:380:8: error: ‘struct usb_serial_port’ has no member named ‘tty’ /usr/local/bin/ztemtApp/zteusbserial/below2.6.27/usb-serial.c:386:20: error: ‘struct usb_serial_port’ has no member named ‘mutex’ /usr/local/bin/ztemtApp/zteusbserial/below2.6.27/usb-serial.c: In function ‘serial_write’: /usr/local/bin/ztemtApp/zteusbserial/below2.6.27/usb-serial.c:407:11: error: ‘struct usb_serial_port’ has no member named ‘open_count’ /usr/local/bin/ztemtApp/zteusbserial/below2.6.27/usb-serial.c:413:2: warning: passing argument 1 of ‘port->serial->type->write’ from incompatible pointer type [enabled by default] /usr/local/bin/ztemtApp/zteusbserial/below2.6.27/usb-serial.c:413:2: note: expected ‘struct tty_struct *’ but argument is of type ‘struct usb_serial_port *’ /usr/local/bin/ztemtApp/zteusbserial/below2.6.27/usb-serial.c:413:2: warning: passing argument 2 of ‘port->serial->type->write’ from incompatible pointer type [enabled by default] /usr/local/bin/ztemtApp/zteusbserial/below2.6.27/usb-serial.c:413:2: note: expected ‘struct usb_serial_port *’ but argument is of type ‘const unsigned char *’ /usr/local/bin/ztemtApp/zteusbserial/below2.6.27/usb-serial.c:413:2: warning: passing argument 3 of ‘port->serial->type->write’ makes pointer from integer without a cast [enabled by default] /usr/local/bin/ztemtApp/zteusbserial/below2.6.27/usb-serial.c:413:2: note: expected ‘const unsigned char *’ but argument is of type ‘int’ /usr/local/bin/ztemtApp/zteusbserial/below2.6.27/usb-serial.c:413:2: error: too few arguments to function ‘port->serial->type->write’ /usr/local/bin/ztemtApp/zteusbserial/below2.6.27/usb-serial.c: In function ‘serial_write_room’: /usr/local/bin/ztemtApp/zteusbserial/below2.6.27/usb-serial.c:429:11: error: ‘struct usb_serial_port’ has no member named ‘open_count’ /usr/local/bin/ztemtApp/zteusbserial/below2.6.27/usb-serial.c:435:2: warning: passing argument 1 of ‘port->serial->type->write_room’ from incompatible pointer type [enabled by default] /usr/local/bin/ztemtApp/zteusbserial/below2.6.27/usb-serial.c:435:2: note: expected ‘struct tty_struct *’ but argument is of type ‘struct usb_serial_port *’ /usr/local/bin/ztemtApp/zteusbserial/below2.6.27/usb-serial.c: In function ‘serial_chars_in_buffer’: /usr/local/bin/ztemtApp/zteusbserial/below2.6.27/usb-serial.c:451:11: error: ‘struct usb_serial_port’ has no member named ‘open_count’ /usr/local/bin/ztemtApp/zteusbserial/below2.6.27/usb-serial.c:457:2: warning: passing argument 1 of ‘port->serial->type->chars_in_buffer’ from incompatible pointer type [enabled by default] /usr/local/bin/ztemtApp/zteusbserial/below2.6.27/usb-serial.c:457:2: note: expected ‘struct tty_struct *’ but argument is of type ‘struct usb_serial_port *’ /usr/local/bin/ztemtApp/zteusbserial/below2.6.27/usb-serial.c: In function ‘serial_throttle’: /usr/local/bin/ztemtApp/zteusbserial/below2.6.27/usb-serial.c:472:11: error: ‘struct usb_serial_port’ has no member named ‘open_count’ /usr/local/bin/ztemtApp/zteusbserial/below2.6.27/usb-serial.c:479:3: warning: passing argument 1 of ‘port->serial->type->throttle’ from incompatible pointer type [enabled by default] /usr/local/bin/ztemtApp/zteusbserial/below2.6.27/usb-serial.c:479:3: note: expected ‘struct tty_struct *’ but argument is of type ‘struct usb_serial_port *’ /usr/local/bin/ztemtApp/zteusbserial/below2.6.27/usb-serial.c: In function ‘serial_unthrottle’: /usr/local/bin/ztemtApp/zteusbserial/below2.6.27/usb-serial.c:491:11: error: ‘struct usb_serial_port’ has no member named ‘open_count’ /usr/local/bin/ztemtApp/zteusbserial/below2.6.27/usb-serial.c:498:3: warning: passing argument 1 of ‘port->serial->type->unthrottle’ from incompatible pointer type [enabled by default] /usr/local/bin/ztemtApp/zteusbserial/below2.6.27/usb-serial.c:498:3: note: expected ‘struct tty_struct *’ but argument is of type ‘struct usb_serial_port *’ /usr/local/bin/ztemtApp/zteusbserial/below2.6.27/usb-serial.c: In function ‘serial_ioctl’: /usr/local/bin/ztemtApp/zteusbserial/below2.6.27/usb-serial.c:511:11: error: ‘struct usb_serial_port’ has no member named ‘open_count’ /usr/local/bin/ztemtApp/zteusbserial/below2.6.27/usb-serial.c:518:3: warning: passing argument 1 of ‘port->serial->type->ioctl’ from incompatible pointer type [enabled by default] /usr/local/bin/ztemtApp/zteusbserial/below2.6.27/usb-serial.c:518:3: note: expected ‘struct tty_struct *’ but argument is of type ‘struct usb_serial_port *’ /usr/local/bin/ztemtApp/zteusbserial/below2.6.27/usb-serial.c:518:3: warning: passing argument 2 of ‘port->serial->type->ioctl’ makes integer from pointer without a cast [enabled by default] /usr/local/bin/ztemtApp/zteusbserial/below2.6.27/usb-serial.c:518:3: note: expected ‘unsigned int’ but argument is of type ‘struct file *’ /usr/local/bin/ztemtApp/zteusbserial/below2.6.27/usb-serial.c:518:3: error: too many arguments to function ‘port->serial->type->ioctl’ /usr/local/bin/ztemtApp/zteusbserial/below2.6.27/usb-serial.c: In function ‘serial_set_termios’: /usr/local/bin/ztemtApp/zteusbserial/below2.6.27/usb-serial.c:535:11: error: ‘struct usb_serial_port’ has no member named ‘open_count’ /usr/local/bin/ztemtApp/zteusbserial/below2.6.27/usb-serial.c:542:3: warning: passing argument 1 of ‘port->serial->type->set_termios’ from incompatible pointer type [enabled by default] /usr/local/bin/ztemtApp/zteusbserial/below2.6.27/usb-serial.c:542:3: note: expected ‘struct tty_struct *’ but argument is of type ‘struct usb_serial_port *’ /usr/local/bin/ztemtApp/zteusbserial/below2.6.27/usb-serial.c:542:3: warning: passing argument 2 of ‘port->serial->type->set_termios’ from incompatible pointer type [enabled by default] /usr/local/bin/ztemtApp/zteusbserial/below2.6.27/usb-serial.c:542:3: note: expected ‘struct usb_serial_port *’ but argument is of type ‘struct termios *’ /usr/local/bin/ztemtApp/zteusbserial/below2.6.27/usb-serial.c:542:3: error: too few arguments to function ‘port->serial->type->set_termios’ /usr/local/bin/ztemtApp/zteusbserial/below2.6.27/usb-serial.c: In function ‘serial_break’: /usr/local/bin/ztemtApp/zteusbserial/below2.6.27/usb-serial.c:554:11: error: ‘struct usb_serial_port’ has no member named ‘open_count’ /usr/local/bin/ztemtApp/zteusbserial/below2.6.27/usb-serial.c:561:3: warning: passing argument 1 of ‘port->serial->type->break_ctl’ from incompatible pointer type [enabled by default] /usr/local/bin/ztemtApp/zteusbserial/below2.6.27/usb-serial.c:561:3: note: expected ‘struct tty_struct *’ but argument is of type ‘struct usb_serial_port *’ /usr/local/bin/ztemtApp/zteusbserial/below2.6.27/usb-serial.c: In function ‘serial_tiocmget’: /usr/local/bin/ztemtApp/zteusbserial/below2.6.27/usb-serial.c:629:11: error: ‘struct usb_serial_port’ has no member named ‘open_count’ /usr/local/bin/ztemtApp/zteusbserial/below2.6.27/usb-serial.c:635:3: warning: passing argument 1 of ‘port->serial->type->tiocmget’ from incompatible pointer type [enabled by default] /usr/local/bin/ztemtApp/zteusbserial/below2.6.27/usb-serial.c:635:3: note: expected ‘struct tty_struct *’ but argument is of type ‘struct usb_serial_port *’ /usr/local/bin/ztemtApp/zteusbserial/below2.6.27/usb-serial.c:635:3: error: too many arguments to function ‘port->serial->type->tiocmget’ /usr/local/bin/ztemtApp/zteusbserial/below2.6.27/usb-serial.c: In function ‘serial_tiocmset’: /usr/local/bin/ztemtApp/zteusbserial/below2.6.27/usb-serial.c:651:11: error: ‘struct usb_serial_port’ has no member named ‘open_count’ /usr/local/bin/ztemtApp/zteusbserial/below2.6.27/usb-serial.c:657:3: warning: passing argument 1 of ‘port->serial->type->tiocmset’ from incompatible pointer type [enabled by default] /usr/local/bin/ztemtApp/zteusbserial/below2.6.27/usb-serial.c:657:3: note: expected ‘struct tty_struct *’ but argument is of type ‘struct usb_serial_port *’ /usr/local/bin/ztemtApp/zteusbserial/below2.6.27/usb-serial.c:657:3: warning: passing argument 2 of ‘port->serial->type->tiocmset’ makes integer from pointer without a cast [enabled by default] /usr/local/bin/ztemtApp/zteusbserial/below2.6.27/usb-serial.c:657:3: note: expected ‘unsigned int’ but argument is of type ‘struct file *’ /usr/local/bin/ztemtApp/zteusbserial/below2.6.27/usb-serial.c:657:3: error: too many arguments to function ‘port->serial->type->tiocmset’ /usr/local/bin/ztemtApp/zteusbserial/below2.6.27/usb-serial.c: In function ‘usb_serial_port_work’: /usr/local/bin/ztemtApp/zteusbserial/below2.6.27/usb-serial.c:697:12: error: ‘struct usb_serial_port’ has no member named ‘tty’ /usr/local/bin/ztemtApp/zteusbserial/below2.6.27/usb-serial.c: In function ‘port_release’: /usr/local/bin/ztemtApp/zteusbserial/below2.6.27/usb-serial.c:709:2: error: ‘struct device’ has no member named ‘bus_id’ /usr/local/bin/ztemtApp/zteusbserial/below2.6.27/usb-serial.c: In function ‘usb_serial_probe’: /usr/local/bin/ztemtApp/zteusbserial/below2.6.27/usb-serial.c:858:2: error: implicit declaration of function ‘lock_kernel’ [-Werror=implicit-function-declaration] /usr/local/bin/ztemtApp/zteusbserial/below2.6.27/usb-serial.c:861:3: error: implicit declaration of function ‘unlock_kernel’ [-Werror=implicit-function-declaration] /usr/local/bin/ztemtApp/zteusbserial/below2.6.27/usb-serial.c:1034:3: error: ‘struct usb_serial_port’ has no member named ‘mutex’ /usr/local/bin/ztemtApp/zteusbserial/below2.6.27/usb-serial.c:1182:23: error: ‘struct device’ has no member named ‘bus_id’ /usr/local/bin/ztemtApp/zteusbserial/below2.6.27/usb-serial.c:1182:51: error: ‘struct device’ has no member named ‘bus_id’ /usr/local/bin/ztemtApp/zteusbserial/below2.6.27/usb-serial.c:1183:3: error: ‘struct device’ has no member named ‘bus_id’ /usr/local/bin/ztemtApp/zteusbserial/below2.6.27/usb-serial.c: In function ‘usb_serial_disconnect’: /usr/local/bin/ztemtApp/zteusbserial/below2.6.27/usb-serial.c:1257:13: error: ‘struct usb_serial_port’ has no member named ‘tty’ /usr/local/bin/ztemtApp/zteusbserial/below2.6.27/usb-serial.c:1258:21: error: ‘struct usb_serial_port’ has no member named ‘tty’ /usr/local/bin/ztemtApp/zteusbserial/below2.6.27/usb-serial.c: At top level: /usr/local/bin/ztemtApp/zteusbserial/below2.6.27/usb-serial.c:1280:2: warning: initialization from incompatible pointer type [enabled by default] /usr/local/bin/ztemtApp/zteusbserial/below2.6.27/usb-serial.c:1280:2: warning: (near initialization for ‘serial_ops.ioctl’) [enabled by default] /usr/local/bin/ztemtApp/zteusbserial/below2.6.27/usb-serial.c:1281:2: warning: initialization from incompatible pointer type [enabled by default] /usr/local/bin/ztemtApp/zteusbserial/below2.6.27/usb-serial.c:1281:2: warning: (near initialization for ‘serial_ops.set_termios’) [enabled by default] /usr/local/bin/ztemtApp/zteusbserial/below2.6.27/usb-serial.c:1284:2: warning: initialization from incompatible pointer type [enabled by default] /usr/local/bin/ztemtApp/zteusbserial/below2.6.27/usb-serial.c:1284:2: warning: (near initialization for ‘serial_ops.break_ctl’) [enabled by default] /usr/local/bin/ztemtApp/zteusbserial/below2.6.27/usb-serial.c:1286:2: error: unknown field ‘read_proc’ specified in initializer /usr/local/bin/ztemtApp/zteusbserial/below2.6.27/usb-serial.c:1286:2: warning: initialization from incompatible pointer type [enabled by default] /usr/local/bin/ztemtApp/zteusbserial/below2.6.27/usb-serial.c:1286:2: warning: (near initialization for ‘serial_ops.ioctl’) [enabled by default] /usr/local/bin/ztemtApp/zteusbserial/below2.6.27/usb-serial.c:1287:2: warning: initialization from incompatible pointer type [enabled by default] /usr/local/bin/ztemtApp/zteusbserial/below2.6.27/usb-serial.c:1287:2: warning: (near initialization for ‘serial_ops.tiocmget’) [enabled by default] /usr/local/bin/ztemtApp/zteusbserial/below2.6.27/usb-serial.c:1288:2: warning: initialization from incompatible pointer type [enabled by default] /usr/local/bin/ztemtApp/zteusbserial/below2.6.27/usb-serial.c:1288:2: warning: (near initialization for ‘serial_ops.tiocmset’) [enabled by default] /usr/local/bin/ztemtApp/zteusbserial/below2.6.27/usb-serial.c: In function ‘usb_serial_init’: /usr/local/bin/ztemtApp/zteusbserial/below2.6.27/usb-serial.c:1352:2: error: implicit declaration of function ‘info’ [-Werror=implicit-function-declaration] /usr/local/bin/ztemtApp/zteusbserial/below2.6.27/usb-serial.c: In function ‘fixup_generic’: /usr/local/bin/ztemtApp/zteusbserial/below2.6.27/usb-serial.c:1406:2: error: ‘struct usb_serial_driver’ has no member named ‘shutdown’ /usr/local/bin/ztemtApp/zteusbserial/below2.6.27/usb-serial.c:1406:2: error: ‘struct usb_serial_driver’ has no member named ‘shutdown’ /usr/local/bin/ztemtApp/zteusbserial/below2.6.27/usb-serial.c:1406:1: error: ‘usb_serial_generic_shutdown’ undeclared (first use in this function) /usr/local/bin/ztemtApp/zteusbserial/below2.6.27/usb-serial.c:1406:1: note: each undeclared identifier is reported only once for each function it appears in cc1: some warnings being treated as errors make[2]: *** [/usr/local/bin/ztemtApp/zteusbserial/below2.6.27/usb-serial.o] Error 1 make[1]: *** [_module_/usr/local/bin/ztemtApp/zteusbserial/below2.6.27] Error 2 make[1]: Leaving directory `/usr/src/linux-headers-3.0.0-12-generic' make: *** [modules] Error 2 Install finished! Any suggestion? Update: from installation document , In some special cases, the setup package can’t automatically compile the driver, so you need change the configurations yourself and manually compile the driver. Method: enter the directory: /usr/local/bin/ztemtApp/zteusbserial, and find the corresponding kernel version of current system. I can see 2.6.27 2.6.28 2.6.29 2.6.30 2.6.31 2.6.32 2.6.33 2.6.34 2.6.35 2.6.36 2.6.37 2.6.38 2.6.39 below2.6.2 in the directory. Which version shall I pick up for installation? Readme file says, we have to do this to insert ztemt.ko in kernel.

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• Installing MySQL-Ruby on Linux and Ruby 1.9.2

  - by Klam

  I am having an absurdly difficult time getting MySQL-Ruby to install on RedHat 4 using Ruby 1.9.2. I am behind a company proxy that prevents pretty much any package tool from connecting to external repositories so "gem install mysql" isn't going to cut it. I have tried installing the mysql-ruby gem locally but it fails with a mysterious: $gem install mysql-2.8.1.gem Building native extensions. This could take a while... ERROR: Error installing mysql-2.8.1.gem: ERROR: Failed to build gem native extension. /ns/local/apps/internal/SWS/MetricsPublisher/ruby/bin/ruby extconf.rb checking for mysql_query() in -lmysqlclient... no checking for main() in -lm... yes checking for mysql_query() in -lmysqlclient... no checking for main() in -lz... yes checking for mysql_query() in -lmysqlclient... no checking for main() in -lsocket... no checking for mysql_query() in -lmysqlclient... no checking for main() in -lnsl... yes checking for mysql_query() in -lmysqlclient... no checking for main() in -lmygcc... no checking for mysql_query() in -lmysqlclient... no *** extconf.rb failed *** Could not create Makefile due to some reason, probably lack of necessary libraries and/or headers. Check the mkmf.log file for more details. You may need configuration options. I have also tried building the module myself by following the included readme. The results: $ruby extconf.rb --with-mysql-include=/path_to_my_sql_headers/mysql/include/ --with-mysql-lib=/path_to_my_sql_lib/mysql/lib/ checking for mysql_query() in -lmysqlclient... no checking for main() in -lm... yes checking for mysql_query() in -lmysqlclient... no checking for main() in -lz... yes checking for mysql_query() in -lmysqlclient... no checking for main() in -lsocket... no checking for mysql_query() in -lmysqlclient... no checking for main() in -lnsl... yes checking for mysql_query() in -lmysqlclient... no checking for main() in -lmygcc... no checking for mysql_query() in -lmysqlclient... no *** extconf.rb failed *** Could not create Makefile due to some reason, probably lack of necessary libraries and/or headers. Check the mkmf.log file for more details. You may need configuration options. Does anybody have any ideas? Quite frankly, I don't even care if MySQL-Ruby specifically works, I just want ANY means of connecting to a MySQL DB through a ruby call in ruby 1.9. Thanks.

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• java+netbeans+mysql+ubuntu 64 bits LTS VS C#+MS SQL for fast develop trading system

  - by crunchor

  I am going to build a trading system and use with the broker "Interactive Broker" API. The API supports C++ Socket, Java Socket, DDE, Active X APIs in Windows. The API supports Java Socket API, Posix C++ Socket API in Unix kind like Ubuntu. My trading system has some real time long calculations to do and a lot of maths for backtest. I am using a retail trading program Amibroker which is written in C++ and I run it in windows xp 32 bits, it will take me days to do one serious backtest with my G620 Sandy Bridge CPU and 3GB of ram. So for my trading system, I need to have 1. speed, 2. stability, 3. fast development I have done some research, C++ is fastest but I am not good at it and it takes much longer time to develop. Other than C++, Java in linux has the best speed. I also did some research for database and look like mysql has the best speed. Mysql and PostgreSQL both are very popular open source sql db, which one should I choose? I see MySQL has Workbench now which looks like similar to MS SQL management studio so look like a good start. Netbeans should be the most popular Java IDE now and seem like its GUI design can be as easy as Virtual Studio now. I am not sure if made by Netbeans would affect the speed and if its GUI design is really that good and easy to use. Ubuntu 64 bits LTS has good long term support, good community support, and stable. I will buy a new computer if I can create a good trading system for live trading and backtest. Very likely I will buy a I7 or I5 depends on if I7 can really have better speed for my case. Actually I mainly deal with C# in my jobs and I just knew java but not good at java. What would you guys recommend? Any better solution? This will be a big project and very likely life long project for me so I seriously do research including asking you guys before I start and focus on what I should, thanks!

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• Apache 2.4 PHP 5.4 mysql not found?

  - by jurchiks

  Just tried setting up the latest Apache (2.4.1 x86 VC10 from apachelounge) and PHP (5.4 VC9 TS X86, with the php5apache2_4.dll) on my PC and ran into this weird problem; in my php.ini I have enabled all of the following: extension=php_mysql.dll extension=php_mysqli.dll extension=php_pdo_mysql.dll but when I try to print the available PDO's using this: print_r(PDO::getAvailableDrivers()); It gives me an empty array. PhpMyAdmin and MantisBT also refuse to work, saying that the mysql extension is missing. phpinfo() gives this: PDO PDO support enabled PDO drivers no value and when searching for mysql, only the mysqlnd section pops up... The DLLs are there in the D:/php/ext folder and no errors pop up when starting up Apache, as well as no errors in the Windows Event Log, and PHP itself has no error log anyway. What could possibly be the problem with this? Before this I had Apache 2.2.22 from apachelounge and PHP 5.3.9 and I had no problems. Now nothing works...

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• Apache cannot find mysql database modules

  - by user809857

  I've created a simple django project and setup a mysql database. My simple project just creates an entry on the database. The project works fine when I use the built in development server provided by django (runserver) and it works well. But when I deployed the project on Apache and mod_Wsgi (Ubuntu server), django could not find 'books', which is in this case my table in the database. The mysql database that I use in runserver and apache are just the same. I also did rebuild the database using sqlall,validate and syncdb of django but still i get the error. What could be wrong with what I'm doing? Thanks

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• Apache cannot find mysql database modules

  - by user809857

  I've created a simple django project and setup a mysql database. My simple project just creates an entry on the database. The project works fine when I use the built in development server provided by django (runserver) and it works well. But when I deployed the project on Apache and mod_Wsgi (Ubuntu server), django could not find 'books', which is in this case my table in the database. The mysql database that I use in runserver and apache are just the same. I also did rebuild the database using sqlall,validate and syncdb of django but still i get the error. What could be wrong with what I'm doing? Thanks

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• creating a google wave clone using php/mysql/jquery

  - by jeansymolanza

  seasons greetings to all. i have a question that has been rather bugging me as of late. does anyone know how one can create a google wave clone using php/mysql/jquery as primary points of development. any ideas on how this might be possible and recommend any starting points? i have some time off work and it would be an interesting project to undertake as i want to use it in an e-learning framework next year. i will be testing the product on a XAMPP local server. i understand some of the technologies that google wave using but i am rather curious as to how these can be developed to a decent standard using php/mysql/jquery (i mention these three because i am quite adept at them). any links to resources best suited to an intermediate programmer would be appreciated. many thanks and God bless. so far i have this: http://konrness.com/javascript/google-wave-style-scroll-bar-jquery-plugin/

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• Migrating master-slave MySQL database servers to 2 new servers, any tips or suggestions?

  - by mmattax

  I'm setting up 2 new database servers that will be replacing a current master-slave setup. All boxes are running / will be running MySQL on RHEL. Our current naming conventions: db1 - master database db2 - slave (using MySQL replication) db01 - new master db02 - new slave We need to get db01 to be the new master with db02 as the new slave. What is the best way to migrate db1 and db2 to db01 and db02? db1 and db2 are running in a production setting and we need to minimize all downtime; db1 has roughly 30GB of data in the database. Any suggestions or tips on how to migrate to our new servers would be much appreciated.

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• Ubuntu and mysql server. Something isnt allowing me to connect

  - by acidzombie24

  I have a question about mysql settings http://serverfault.com/questions/94054/remote-connections-and-mysql-on-ubuntu/94088#94088 now i want to figure out why i cannot connect. I made sure bind-address was commented out. I can ping the server within the VM but i cannot ping it from within the VM using mysqladmin --protocol=tcp --host=self_ip ping. I also followed along and check if my ports were open and they look like they are. I setup samba on that VM and can access that with no problem as well. It looks like ubuntu does not have a firewall either (i figured this out before) so i am stumped why the server isnt allowing my connection. Apparently the config file works on another person side http://www.pastie.org/742545 I am using Ubuntu 6.06 LTS just because of 'support' reasons. So hopefully this will be 'easy'?

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• "Error 1067: The process terminated unexpectedly" when trying to install MySQL on Win7 x64.

  - by Gravitas

  Hi, I've run into a brick wall trying to install MySQL v5.5 on my machine. My PC is Windows 7 x64, Enterprise edition. MySQL installs fine, but when I run the "MySQL Instance Configuration Wizard", it pauses forever on the step "Start Service" (I can let it run for 30 minutes with no response). If I go into services, I see that the "MySQL" service hasn't started, and if I try to start it, it says "Windows could not start MySQL Service on Local Computer. Error 1067: The process terminated unexpectedly." I've tried the following: Turning off firewall. Uninstalling all antivirus software. Installing / reinstalling 32-bit version of MySQL. Installing / reinstalling 64-bit version of MySQL. Uninstalling, deleting the contents of "C:\program files\MySQL" and "C:\program files (x86)\MySQL", reinstalling. Checking to see that there is no rogue services named MySQL???? (from a previous install). Checking that port 3306 is not used by an alternate program. Changing the default port that MySQL uses. Checking for "my.ini" and "my.ini.cnf" in "C:\windows" (nothing there but that can cause a problem). Running both MySQL installer, and configuration wizard, in "Adminstrator mode". Turning off UAC. Installing with defaults, not changing anything. Rebooting my machine (about 6 reboots so far). Opening up port 3306 in the firewall (both TCP and UDP, inbound and outbound). Swearing at the klutz of a programmer who designed MySQL so you can't even install it (as if that would help!) My machine is working 100% in every other way. InfiniDB (a MySQL compatible database) installs 100%, as does Visual Studio 2010, Microsoft SQL Server, etc, etc. Your advice on how to work around this? p.s. Here is the screen it got stuck on for 15 minutes until I killed the process: Update 2010-12-20 Tried MySQL v5.1, it didn't work either. Its amazing - if you type "mysqld /?", or "mysqld -help", it doesn't give you any help. And, if you try to restart the service manually, it doesn't display any error messages. Could it be any more unhelpful? Update 2010-12-21 Installed MySQL 6.0 alpha, and it worked. However, I'd rather not use an alpha release, given that the "stable" release is anything but :( Update 2010-12-21 Found http://dev.mysql.com/doc/refman/5.1/en/windows-troubleshooting.html, dealing with troubleshooting under Windows. Discovered that you can generate an error log if the service doesn't start - see here: http://dev.mysql.com/doc/refman/5.1/en/error-log.html

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• php+mysql account management software?

  - by kdavis8

  I need an account system added to my website as a plugin to all of my HTML pages. The account system plugin needs to,register new users, log in current users, remove users who want to disconnect service, and manipulate all of these things via database on my web server. However, I do not know how to program in the PHP language or create and manipulate MySQL databases. I want a program that can create and manipulate the MySQL database automatically for my website and handle also PHP calls automatically. Are there any open source freeware programs out there that i can use? If so what are the names of these freeware?

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• How to install the MySQL Ruby Gem on Ubuntu 9.10?

  - by misbehavens

  I am having a problem installing the Ruby Gem for MySQL. This is the command that I am running: sudo gem install mysql and this is the output that I'm getting: Building native extensions. This could take a while... ERROR: Error installing mysql: ERROR: Failed to build gem native extension. /usr/bin/ruby1.8 extconf.rb checking for mysql_query() in -lmysqlclient... no checking for main() in -lm... yes checking for mysql_query() in -lmysqlclient... no checking for main() in -lz... yes checking for mysql_query() in -lmysqlclient... no checking for main() in -lsocket... no checking for mysql_query() in -lmysqlclient... no checking for main() in -lnsl... yes checking for mysql_query() in -lmysqlclient... no checking for main() in -lmygcc... no checking for mysql_query() in -lmysqlclient... no *** extconf.rb failed *** Could not create Makefile due to some reason, probably lack of necessary libraries and/or headers. Check the mkmf.log file for more details. You may need configuration options. Provided configuration options: --with-opt-dir --without-opt-dir --with-opt-include --without-opt-include=${opt-dir}/include --with-opt-lib --without-opt-lib=${opt-dir}/lib --with-make-prog --without-make-prog --srcdir=. --curdir --ruby=/usr/bin/ruby1.8 --with-mysql-config --without-mysql-config --with-mysql-dir --without-mysql-dir --with-mysql-include --without-mysql-include=${mysql-dir}/include --with-mysql-lib --without-mysql-lib=${mysql-dir}/lib --with-mysqlclientlib --without-mysqlclientlib --with-mlib --without-mlib --with-mysqlclientlib --without-mysqlclientlib --with-zlib --without-zlib --with-mysqlclientlib --without-mysqlclientlib --with-socketlib --without-socketlib --with-mysqlclientlib --without-mysqlclientlib --with-nsllib --without-nsllib --with-mysqlclientlib --without-mysqlclientlib --with-mygcclib --without-mygcclib --with-mysqlclientlib --without-mysqlclientlib Gem files will remain installed in /usr/lib/ruby/gems/1.8/gems/mysql-2.8.1 for inspection. Results logged to /usr/lib/ruby/gems/1.8/gems/mysql-2.8.1/ext/mysql_api/gem_make.out What do I need to do in order to get this to install?

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• How to use Binary Log file for Auditing and Replicating in MySQL?

  - by Pranav

  How to use Binary Log file for Auditing in MySQL? I want to track the change in a DB using Binary Log so that I can replicate these changes to other DB please do not give me hyperlinks for MySQL website. please direct me to find the solution I have looked for auditing options and created a script using Triggers for that, but due toi the Joomla DB structure it did'nt worked for me, hence I have to move on to Binary Log file concept now i am stucked in initiating the concept as I am not getting the concept of making the server master/slave, so can any body guide me how to actually initiate it via PHP?

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• mssql or mysql: learning

  - by Yehuda

  I have been using MySQL for about 9 months now for websites, and i have become quite good in getting what I want out of the Database. However i am still missing most of the complicated parts. I have an excellent tutorial but it is on sql-server 2008. 1) Is it worth me switching over to mssql (I understand the SQL is different) so that I will learn all about SQL and databases in general? 2) Do most people use MySQL or MSSQL 3) What is best practice, and I am talking mainly for websites.

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• Recent Ubuntu update prevents MySQL root access

  - by Rhys

  I recently updated my Ubuntu (10.04 LTS) server (apt-get update, apt-get upgrade), and everything works fine, apart from the root access to my MySQL database. phpMyAdmin, CakePHP, and essentially all connections return similar access errors. For example, PMA returns 'Connection for controluser as defined in your configuration failed.' I have tried to find similar examples of this instance, but cannot find assistance in what configuration I should be changing to restore root log in access. The same issue has occurred on two servers. One has additional users so I could get around it, but the other is a new development server with only root MySQL access, so I am stuck on how to resolve this.

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• how execute mysql command DELIMITER

  - by user5332

  hi, I have huge problem (for me) I need from PHP execute mysql command DELIMITER | but mysql_query fails on error... and I found that mysql_query doesn't support usage of DELIMITER, because this command may be working only in mysql console but when I open phpMyAdmin ... is there at SQL tab an option to change DELIMITER and it works... but I don't know how... could you help me? who is possile to change delimiter from PHP? I need it to do before CREATE TRIGGER ... that uses several ; that may not be interpreted like command end

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• MySQL Workbench 5.2.39 GA Released

  - by user13164789

  The MySQL Developer Tools team is announcing the next maintenance release of its flagship product, MySQL Workbench, version 5.2.39. This version contains MySQL Utilities 1.0.5, a set of command line Python utilities for helping to perform and script various administration tasks for MySQL. A complete list of changes in this release of the Utilities can be found at:http://dev.mysql.com/doc/workbench/en/wb-utils-news-1-0-5.html MySQL Workbench 5.2 GA • Data Modeling • Query (replaces the old MySQL Query Browser) • Administration (replaces the old MySQL Administrator) Please get your copy from our Download site. Sources and binary packages are available for several platforms, including Windows, Mac OS X and Linux. http://dev.mysql.com/downloads/workbench/ Workbench Documentation can be found here. http://dev.mysql.com/doc/workbench/en/index.html Utilities Documentation can be found here.http://dev.mysql.com/doc/workbench/en/mysql-utilities.html In addition to the new Query/SQL Development and Administration modules, version 5.2 features improved stability and performance – especially in Windows, where OpenGL support has been enhanced and the UI was optimized to offer better responsiveness. This release also includes improvements to the scripting capabilities of the SQL Editor. You can read more about it in http://wb.mysql.com/workbench/doc/ For a detailed list of resolved issues, see the change log. http://dev.mysql.com/doc/workbench/en/wb-change-history.html If you need any additional info or help please get in touch with us. Post in our forums or leave comments on our blog pages. - The MySQL Workbench Team

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• /dev/sda1 100% Mysql to blame?

  - by SJP

  I have a an API running that receives raw binaries, processes them, and then stores metadata about the bins in a mysql database. I have been running it for a couple days on a VM. Today the API stopped processing the mySQL commands. After using the command df-h the results were: root@mwdb1:/# df -h Filesystem Size Used Avail Use% Mounted on /dev/sda1 104G 99G 0 100% / udev 16G 4.0K 16G 1% /dev tmpfs 6.3G 364K 6.3G 1% /run none 5.0M 0 5.0M 0% /run/lock none 16G 0 16G 0% /run/shm /dev/sdb1 5.5T 42G 5.2T 1% /data sda1 is at 100%

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• Hosting a Small PHP/MySQL Project [closed]

  - by paulrehkugler

  I have a small PHP/MySQL project in the works and I'm looking for somewhere to host it. My criteria are: Ability to run PHP/MySQL (either natively, or contains the ability to install). Ability to manipulate the web server, so I can make pretty URLs. Not spammy (if you've ever looked for hosting, you know what I mean). Semi-professional - no ridiculous downtime or long response time. I obviously don't need anything spectacular (I'm not aiming to be the next Facebook) but something that doesn't seem cheap. Reasonably priced - obviously this is a side project for fun so I'm not planning on making or dispensing any sort of "serious" revenue.

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• MySQL with mutiple threads and processes

  - by Abhan

  I'm developing a telecom messaging platform in C, and I'm going to need multiple processes to be working with MySQL DB. How can I make two processes read/write to/from a Mysql DB and, if/when one of them goes down, get the other to seamlessly take over the work until the dead process gets back to work? I was thinking/googling some options and am stuck in place where I don't know which one to choose. What I think so far is that table lock is not the best option to go for, as it will stall the other process until the table is unlocked. The other option is to use row-level locks or manual locks, but I can't find the best way to do it.

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• mysql database cannot connect with cpanel [closed]

  - by Rafee

  And this question was asked on http://stackoverflow.com/questions/8182119/mysql-database-cannot-connect-with-cpanel <?php $con1 = mysql_connect("mywebsiteip","mysql_username","mysql_user_password"); if(!$con1) { die ("Could not connect " . mysql_error()); } else { echo "Good connection"; } mysql_close($con1); ?> When i run it, it cannot connect to mysql database over cpanel. and i even tried up $con1 = mysql_connect("mywebsiteip:portnumber","mysql_username","mysql_user_password"); Can any let me know, which one is good way.

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• MySQL prevents server from booting unless password is entered

  - by ZaneKullman

  I am kind of new with Ubuntu but I have been working on setting up a LAMP server with hamachi as a vpn client for management. The issue is that when we turn the server on or restart it we are required to enter the MySQL password before it will continue. Where can we script a password or disable this? I have attached a partial of less /var/log/boot.log * Starting MySQL ServerESC[204G[ OK ] ....... ok Password: If I haven't provided enough information please just comment and Ill try my best.

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• Mysql 100% CPU + Slow query

  - by felipeclopes

  I'm using the RDS database from amazon with a some very big tables, and yesterday I started to face 100% CPU utilisation on the server and a bunch of slow query logs that were not happening before. I tried to check the queries that were running and faced this result from the explain command +----+-------------+-------------------------------+--------+----------------------------------------------------------------------------------------------+---------------------------------------+---------+-----------------------------------------------------------------+------+----------------------------------------------+ | id | select_type | table | type | possible_keys | key | key_len | ref | rows | Extra | +----+-------------+-------------------------------+--------+----------------------------------------------------------------------------------------------+---------------------------------------+---------+-----------------------------------------------------------------+------+----------------------------------------------+ | 1 | SIMPLE | businesses | const | PRIMARY | PRIMARY | 4 | const | 1 | Using index; Using temporary; Using filesort | | 1 | SIMPLE | activities_businesses | ref | PRIMARY,index_activities_users_on_business_id,index_tweets_users_on_tweet_id_and_business_id | index_activities_users_on_business_id | 9 | const | 2252 | Using index condition; Using where | | 1 | SIMPLE | activities_b_taggings_975e9c4 | ref | taggings_idx | taggings_idx | 782 | const,myapp_production.activities_businesses.id,const | 1 | Using index condition; Using where | | 1 | SIMPLE | activities | eq_ref | PRIMARY,index_activities_on_created_at | PRIMARY | 8 | myapp_production.activities_businesses.activity_id | 1 | Using where | +----+-------------+-------------------------------+--------+----------------------------------------------------------------------------------------------+---------------------------------------+---------+-----------------------------------------------------------------+------+----------------------------------------------+ Also checkin in the process list, I got something like this: +----+-----------------+-------------------------------------+----------------------------+---------+------+--------------+------------------------------------------------------------------------------------------------------+ | Id | User | Host | db | Command | Time | State | Info | +----+-----------------+-------------------------------------+----------------------------+---------+------+--------------+------------------------------------------------------------------------------------------------------+ | 1 | my_app | my_ip:57152 | my_app_production | Sleep | 0 | | NULL | | 2 | my_app | my_ip:57153 | my_app_production | Sleep | 2 | | NULL | | 3 | rdsadmin | localhost:49441 | NULL | Sleep | 9 | | NULL | | 6 | my_app | my_other_ip:47802 | my_app_production | Sleep | 242 | | NULL | | 7 | my_app | my_other_ip:47807 | my_app_production | Query | 231 | Sending data | SELECT my_fields... | | 8 | my_app | my_other_ip:47809 | my_app_production | Query | 231 | Sending data | SELECT my_fields... | | 9 | my_app | my_other_ip:47810 | my_app_production | Query | 231 | Sending data | SELECT my_fields... | | 10 | my_app | my_other_ip:47811 | my_app_production | Query | 231 | Sending data | SELECT my_fields... | | 11 | my_app | my_other_ip:47813 | my_app_production | Query | 231 | Sending data | SELECT my_fields... | ... So based on the numbers, it looks like there is no reason to have a slow query, since the worst execution plan is the one that goes through 2k rows which is not much. Edit 1 Another information that might be useful is the slow query_log SET timestamp=1401457485; SELECT my_query... # User@Host: myapp[myapp] @ ip-10-195-55-233.ec2.internal [IP] Id: 435 # Query_time: 95.830497 Lock_time: 0.000178 Rows_sent: 0 Rows_examined: 1129387 Edit 2 After profiling, I got this result. The result have approximately 250 rows with two columns each. +----------------------+----------+ | state | duration | +----------------------+----------+ | Sending data | 272 | | removing tmp table | 0 | | optimizing | 0 | | Creating sort index | 0 | | init | 0 | | cleaning up | 0 | | executing | 0 | | checking permissions | 0 | | freeing items | 0 | | Creating tmp table | 0 | | query end | 0 | | statistics | 0 | | end | 0 | | System lock | 0 | | Opening tables | 0 | | logging slow query | 0 | | Sorting result | 0 | | starting | 0 | | closing tables | 0 | | preparing | 0 | +----------------------+----------+ Edit 3 Adding query as requested SELECT activities.share_count, activities.created_at FROM `activities_businesses` INNER JOIN `businesses` ON `businesses`.`id` = `activities_businesses`.`business_id` INNER JOIN `activities` ON `activities`.`id` = `activities_businesses`.`activity_id` JOIN taggings activities_b_taggings_975e9c4 ON activities_b_taggings_975e9c4.taggable_id = activities_businesses.id AND activities_b_taggings_975e9c4.taggable_type = 'ActivitiesBusiness' AND activities_b_taggings_975e9c4.tag_id = 104 AND activities_b_taggings_975e9c4.created_at >= '2014-04-30 13:36:44' WHERE ( businesses.id = 1 ) AND ( activities.created_at > '2014-04-30 13:36:44' ) AND ( activities.created_at < '2014-05-30 12:27:03' ) ORDER BY activities.created_at; Edit 4 There may be a chance that the indexes are not being applied due to difference in column type between the taggings and the activities_businesses, on the taggable_id column. mysql> SHOW COLUMNS FROM activities_businesses; +-------------+------------+------+-----+---------+----------------+ | Field | Type | Null | Key | Default | Extra | +-------------+------------+------+-----+---------+----------------+ | id | int(11) | NO | PRI | NULL | auto_increment | | activity_id | bigint(20) | YES | MUL | NULL | | | business_id | bigint(20) | YES | MUL | NULL | | +-------------+------------+------+-----+---------+----------------+ 3 rows in set (0.01 sec) mysql> SHOW COLUMNS FROM taggings; +---------------+--------------+------+-----+---------+----------------+ | Field | Type | Null | Key | Default | Extra | +---------------+--------------+------+-----+---------+----------------+ | id | int(11) | NO | PRI | NULL | auto_increment | | tag_id | int(11) | YES | MUL | NULL | | | taggable_id | bigint(20) | YES | | NULL | | | taggable_type | varchar(255) | YES | | NULL | | | tagger_id | int(11) | YES | | NULL | | | tagger_type | varchar(255) | YES | | NULL | | | context | varchar(128) | YES | | NULL | | | created_at | datetime | YES | | NULL | | +---------------+--------------+------+-----+---------+----------------+ So it is examining way more rows than it shows in the explain query, probably because some indexes are not being applied. Do you guys can help m with that?

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• Recommended approach for error handling with PHP and MYSQL

  - by iama

  I am trying to capture database (MYSQL) errors in my PHP web application. Currently, I see that there are functions like mysqli_error(), mysqli_errno() for capturing the last occurred error. However, this still requires me to check for error occurrence using repeated if/else statements in my php code. You may check my code below to see what I mean. Is there a better approach to doing this? (or) Should I write my own code to raise exceptions and catch them in one single place? What is the recommended approach? Also, does PDO raise exceptions? Thanks. function db_userexists($name, $pwd, &$dbErr) { $bUserExists = false; $uid = 0; $dbErr = ''; $db = new mysqli(SERVER, USER, PASSWORD, DB); if (!mysqli_connect_errno()) { $query = "select uid from user where uname = ? and pwd = ?"; $stmt = $db->prepare($query); if ($stmt) { if ($stmt->bind_param("ss", $name, $pwd)) { if ($stmt->bind_result($uid)) { if ($stmt->execute()) { if ($stmt->fetch()) { if ($uid) $bUserExists = true; } } } } if (!$bUserExists) $dbErr = $db->error(); $stmt->close(); } if (!$bUserExists) $dbErr = $db->error(); $db->close(); } else { $dbErr = mysqli_connect_error(); } return $bUserExists; }

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