Category Archives: My SQL

check last executed query mysql

You can controll this option at run time.

If you prefer to output to a table:

Execute SET GLOBAL log_output = 'TABLE';
Execute SET GLOBAL general_log = 'ON';
Take a look at the table mysql.general_log

If you prefer to output to a file instead of a table:

SET GLOBAL log_output = "FILE"; the default.
SET GLOBAL general_log_file = "/path/to/your/logfile.log";
SET GLOBAL general_log = 'ON';

Import a large sql dump file

1) Set network buffer length to a large byte number. The default value may throw errors for such large data files

set global net_buffer_length=1000000;

2) Set maximum allowed packet size to a large byte number.The default value may throw errors for such large data files.

set global max_allowed_packet=1000000000;

3) Disable foreign key checking to avoid delays,errors and unwanted behaviour

SET foreign_key_checks = 0;

4) Import your sql dump file


5) Enable foreign key checks when import is done.

SET foreign_key_checks = 1;
innodb_buffer_pool_size    = 1G
innodb_log_buffer_size = 1G
innodb_write_io_threads = 16
innodb_flush_log_at_trx_commit = 0
innodb_log_file_size = 1G

Prepared Statements MySQL

Similar in concept to templates – contain compiled code used to run common sql operations

o Advantages:

 Query only parsed once, but allows for multiple executions, with same or different parameters (performance consideration)

 Related parameters do not need to be quoted (security consideration)

o Only feature pdo will emulate for adapters that do not support prepared statements


• Combines individual sql operations into one
• Usually start with begin or begin transaction
• Execute the transaction using commit
• Cancel the transaction using rollback


START TRANSACTION; SELECT @A:=SUM(salary) FROM table1 WHERE type=1; UPDATE table2 SET summary=@A WHERE type=1; COMMIT;

Unbuffered Queries

Unbuffered MySQL queries execute the query and then return a resource while the data is still waiting on the MySQL server for being fetched. This uses less memory on the PHP-side, but can increase the load on the server. Unless the full result set was fetched from the server no further queries can be sent over the same connection. Unbuffered queries can also be referred to as “use result”.