This involves MySQL 5.7 running on Windows Server 2016.
I'm working with a TRUNCATE statement in MySql to reduce the size of a large Log file (named "mySite.log"), which resides in:
ProgramData/MySQL/MySQL Server 5.7/Data/
I have researched and implemented the following:
mysql> SET GLOBAL general_log=OFF;
and this was successful.
However, I am trying to ascertain that the large log file that I see in the directory stated above is in fact the General Query Log File. It carries the name of the database as the prefix of the file name ("MySite.log") just as the other files (.bin's and .err, .pid) in the same directory do.
Is this large log file actually the general_log file? (If using MySQL Workbench, where would the naming of the log file and storage location be set up? I can't seem to locate that.)
Will the following syntax truncate the log file?
mysql> TRUNCATE TABLE mysql.general_log;
Will 'TRUNCATE TABLE' be used, even if the log is stored in a file, rather than database table?
Will 'mysql.general_log' need to be renamed to 'myDatabase.mysite' to match the name of my "MySite.log" file, from above?
Thanks for any leads.
Some interesting manual entries to read about this:
5.4.1 Selecting General Query and Slow Query Log Output Destinations
5.4.3 The General Query Log
You can check how your server is configured with
SHOW GLOBAL VARIABLES LIKE '%log%';
Then look for the value of log-output. This shows if you're logging to FILE, TABLE or both.
When it's FILE, check for the value of general_log_file. This is where the log file is in your file system. You can simply remove it, and create a new file (in case you ever want to enable general_log again). Then execute FLUSH LOGS; afterwards.
When it's TABLE then your TRUNCATE TABLE mysql.general_log; statement is correct.
Regarding your second question, just never mess with the tables in the mysql schema. Just don't (if you don't know what you're doing). Also I don't even get how you got to that thought.
This question already has answers here:
How do I rename a MySQL database (change schema name)?
(46 answers)
Closed 9 days ago.
How can I change the database name of my database?
I tried to use the rename database command, but on the documents about it it is said that it is dangerous to use. Then what should I need to do to rename my database name?
For example, if I want to rename my database to this.
database1 -> database2?
Follow bellow steps:
shell> mysqldump -hlocalhost -uroot -p database1 > dump.sql
mysql> CREATE DATABASE database2;
shell> mysql -hlocalhost -uroot -p database2 < dump.sql
If you want to drop database1 otherwise leave it.
mysql> DROP DATABASE database1;
Note : shell> denote command prompt and mysql> denote mysql prompt.
I don't think it's possible.
You can use mysqldump to dump the data and then create a schema with your new name and then dump the data into that new database.
Unfortunately, MySQL does not explicitly support that (except for dumping and reloading database again).
From http://dev.mysql.com/doc/refman/5.1/en/rename-database.html:
13.1.32. RENAME DATABASE Syntax
RENAME {DATABASE | SCHEMA} db_name TO new_db_name;
This statement was added in MySQL 5.1.7 but was found to be dangerous and was removed in MySQL 5.1.23. ... Use of this statement could result in loss of database contents, which is why it was removed. Do not use RENAME DATABASE in earlier versions in which it is present.
"As long as two databases are on the same file system, you can use RENAME TABLE to move a table from one database to another"
-- ensure the char set and collate match the existing database.
SHOW VARIABLES LIKE 'character_set_database';
SHOW VARIABLES LIKE 'collation_database';
CREATE DATABASE `database2` DEFAULT CHARACTER SET = `utf8` DEFAULT COLLATE = `utf8_general_ci`;
RENAME TABLE `database1`.`table1` TO `database2`.`table1`;
RENAME TABLE `database1`.`table2` TO `database2`.`table2`;
RENAME TABLE `database1`.`table3` TO `database2`.`table3`;
http://dev.mysql.com/doc/refman/5.7/en/rename-table.html
You can change the database name using MySQL interface.
Go to http://www.hostname.com/phpmyadmin
Go to database which you want to rename. Next, go to the operation tab. There you will find the input field to rename the database.
InnoDB supports RENAME TABLE statement to move table from one database to another. To use it programmatically and rename database with large number of tables, I wrote a couple of procedures to get the job done.
You can check it out here - SQL script #Gist
To use it simply call the renameDatabase procedure.
CALL renameDatabase('old_name', 'new_name');
Tested on MariaDB and should work ideally on all RDBMS using InnoDB transactional engine.
I agree with above answers and tips but there is a way to change database name with phpmyadmin
Renaming the Database
From cPanel, click on phpMyAdmin. (It should open in a new tab.)
Click on the database you wish to rename in the left hand column.
Click on the Operations tab.
Where it says "Rename database to:" enter the new database name.
Click the Go button.
When it asks you to want to create the new database and drop the old database, click OK to proceed. (This is a good time to make sure you spelled the new name correctly.)
Once the operation is complete, click OK when asked if you want to reload the database.
here's the video tutorial:
http://support.hostgator.com/articles/specialized-help/technical/phpmyadmin/how-to-rename-a-database-in-phpmyadmin
Another way to rename the database or taking an image of the database is by using the reverse engineering option in the database tab. It will create an ER diagram for the database. Rename the schema there.
After that, go to the File menu and go to export and forward engineer the database.
Then you can import the database.
Sequel Ace database client have a rename database functionality. Select the database you would like to edit and click Database in the menu and then click Rename Database from the dropdown. Rename the database and ckick rename. Done!
After much aggravation this is what I have found to work"simply".
First thing, I am using MYSQL Workbench and the import would not work as it should, as the import dump file would always revert to the original schema name.
I spent several hours trying every thing to no avail,all for a spelling error.
I solved the issue by opening one of the .sql dump files in notebook and hand editing the typo's of the schema name, take care to rename all instances schema name has three in the beginning, save the file and then import. this worked perfectly for me and hope that it will help others looking for the simple answer to changing database names/schema names.
One more tip that I have found true, when programs do not do as they should go to the "source" literally find the source code.
Hope this helps someone
Low rep so they wont let me comment on the prior/post answer(it keeps changing rank or position), so I added it here. reverse engineering will work fine as long as there is no data in the sever table. if data exists and you try to update the server after the name change it will either pull an error or just create a new database/schema with no data, I know I tried ten times to no avail.
The above works simply and avoids headaches, as one can review the SQL code for other errors if any or change table names or creation data.
the .sql file is just a compiled SQL code so in theory one could copy and add it through PHP or the script console of the database management tool.
You can use below command
alter database Testing modify name=LearningSQL;
Old Database Name = Testing,
New Database Name = LearningSQL
Go to data directory and try this:
mv database1 database2
It works for me on a 900 MB database size.
Try:
RENAME database1 TO database2;
I have a MySQL Server which has one database called "Backup".
It only has one table with the name "storage".
In the Backup db the storage table contains about 5 Millions datarows.
Now I wanted to append new rows to the table by using the "source" command in the SQL command line.
So what happend is, that source uploaded all the new files in the table, but it overwrote the existing entries (seems that he first deleted all data)
What I have to say is that the sql file that I want to update comes from another server where this table has the same name and structure as "storage".
What I want is to append the new entries that are in the sql file to the one in my datebase. I do not want to overwrite them.
The structure in the two tables is exactly the same. I use the Backup datebase as the name says for backup uses, so that from time to time I can backup my data.
Has anyone an idea how to solve this?
Look in the .sql file you're reading with the SOURCE command, and remove the DROP TABLE and CREATE TABLE statements that appear there. They are the cause of your table being overwritten; what's actually happening is that the table is being replaced.
You could also look into using SELECT ... INTO OUTFILE and LOAD DATA INFILE as a faster and less potentially destructive way to get data from one server to the other in a file.
I'm trying to backup some of my data stored in a big table with
SELECT ... INTO OUTFILE
statement.
The output file is on a network hard drive, so if the network connection breaks just during the dump (it takes one minute more or less) I find a partial file on my network hard drive and I'd like to mark such file as "wrong".
Is there a SQL command that I can give inside my MySQL Stored Procedure that let me rename such file?
Thank you very much
Best
cghersi
You can't rename file in mysql, but you could use two files for dump and rotate it only when operation was successful.
Example:
You make dump to 'a.csv', if operation was successful will use 'b.csv' for next dump, otherwise use 'a.csv' again. And so on...
I am trying to upload a 32mb MYSQL database into a pre-existing database, but the php admin on my shared hosting has a 10mb limit... I have tried zipping it up - but when the server unzips the database, the uncompressed file is too large for the server to handle.
Is it possible to split the database up and upload it by pasting it in parts as an SQL query - I assume I would need each chunk to have something at the start of it which says
"Import this data into the pre-existing tables in the database"
What would this be?
At the moment there is a few hundred lines saying things like "CREATE" and "INSERT INTO"
You might try connecting to the database remotely with mysql workbench, or command line tool mysql. If you can do that, you can run:
source c:/path/to/your/file.sql
and you won't be constrained by phpmyadmin's upload size restrictions. Most shared hosting I've seen allows it. If not, you may just need to grant permissions for the user#host in phpmyadmin (or whatever the interface is).
The dump file created by mysqldump is just a set of SQL statements that will rebuild your tables.
To load it in in chunks I'd recommend either dumping it out in sets of tables and loading them one by one or if required the dump file should be roughly in the same (pseudo) format:
Set things up ready for loading
CREATE TABLE t1;
INSERT INTO TABLE t1...;
INSERT INTO TABLE t1...;
CREATE TABLE t2;
INSERT INTO TABLE t2...;
INSERT INTO TABLE t2...;
Finalise stuff after loading
You can manually split the file up by keeping the commands at the start and finish and just choosing blocks for individual tables by looking for their CREATE TABLE statements.