BreadCrumbs: Mysql

Mysql

From Luke Jackson

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Revision as of 11:25, 10 February 2016 (edit)
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(Show Table(s))
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Current revision (04:11, 14 October 2016) (edit)
Ljackson (Talk | contribs)
(Basic my.cnf)
 
Line 1: Line 1:
 +== Show Process List (Running Queries) ==
 +
 + SHOW PROCESSLIST;
 + SHOW FULL PROCESSLIST;
 +
 +== Show Global Variables/Status ==
 +
 + SHOW GLOBAL VARIABLES LIKE '%slow%';
 + SHOW GLOBAL VARIABLES LIKE 'innodb_buffer_pool_size';
 + SHOW GLOBAL STATUS LIKE 'Innodb%_page%';
 +
 + SHOW TABLE STATUS;
 +
== Dump Specific Tables == == Dump Specific Tables ==
Line 4: Line 17:
== Terminal Command Line == == Terminal Command Line ==
 +
 +== Echo Output Direct to Terminal ==
 +
 + echo "SHOW GLOBAL VARIABLES LIKE 'innodb_buffer_pool_size';" | mysql -S /local/mysql/io85/mysql.sock io85
=== Show Table(s) === === Show Table(s) ===
Line 31: Line 48:
show table status like 'user_prd_batch_data%'; show table status like 'user_prd_batch_data%';
 +'''Indexes'''
-=== Show Columns Fields ===+ show indexes from user_prd_batch_data;
 + 
 +=== Show Columns/Fields ===
desc user_prd_batch_data; desc user_prd_batch_data;
- or+or
show columns from user_prd_batch_data; show columns from user_prd_batch_data;
Line 89: Line 109:
skip-name-resolve skip-name-resolve
default-storage-engine=innodb default-storage-engine=innodb
 +</pre>
 +
 +'''ERROR 2006 (HY000) at line 1: MySQL server has gone away'''
 +
 + set global max_allowed_packet=104857600
 +
 + permanent set in my.cnf
 +
 + max_allowed_packet = 128M
 +
 +Macports
 +
 +<pre>
 +[mysqld]
 +default-storage-engine=innodb
 +innodb_file_per_table
 +innodb_file_format = Barracuda
 +collation-server = utf8_unicode_ci
 +init-connect='SET NAMES utf8'
 +character-set-server = utf8
 +max_allowed_packet = 128M
 +
 +[client]
 +default-character-set=utf8
 +
 +[mysql]
 +default-character-set=utf8
 +</pre>
 +
 +== Queries ==
 +
 +=== Random Data Generator ===
 +
 +<pre>
 +INSERT INTO `plug_in_track_prd_location_scans` ( `emply_id`, `dept_id`, `order_id`, `trans_id`, `note`, `m_login`, `c_timestamp`) VALUES
 +( 11111, (ROUND(RAND() * (24-19) + 19)), NULL, (ROUND( RAND( ) * RAND( ) *9028982 )), NULL, 'ljackson', (NOW() - INTERVAL (ROUND(RAND() * (9-1) + 1)) DAY));
</pre> </pre>

Current revision

Contents

Show Process List (Running Queries)

SHOW PROCESSLIST;
SHOW FULL PROCESSLIST;

Show Global Variables/Status

SHOW GLOBAL VARIABLES LIKE '%slow%';
SHOW GLOBAL VARIABLES LIKE 'innodb_buffer_pool_size';
SHOW GLOBAL STATUS LIKE 'Innodb%_page%';
SHOW TABLE STATUS;

Dump Specific Tables

mysqldump -u XXX -pXXX mydb t1 t2 t3 > mydb_tables.sql

Terminal Command Line

Echo Output Direct to Terminal

echo "SHOW GLOBAL VARIABLES LIKE 'innodb_buffer_pool_size';" | mysql -S /local/mysql/io85/mysql.sock io85

Show Table(s)

All Tables in Database

SELECT table_name AS "Tables",  round(((data_length + index_length) / 1024 / 1024), 2) "Size in MB"  FROM information_schema.TABLES  WHERE table_schema = "$DB_NAME" ORDER BY (data_length + index_length) DESC;

Single Table

SELECT table_name AS "Table", 
round(((data_length + index_length) / 1024 / 1024), 2) "Size in MB" 
FROM information_schema.TABLES 
WHERE table_schema = "$DB_NAME"
 AND table_name = "$TABLE_NAME";

Table Status

show table status from io85 WHERE name = "stored_action_parameters"\G

Compare Table Sizes (i.e. check status of copy)

show table status like 'user_prd_batch_data%';

Indexes

show indexes from user_prd_batch_data;

Show Columns/Fields

desc user_prd_batch_data;

or

show columns from user_prd_batch_data;

Export SQL as .TXT , .CSV

SELECT order_id,product_name,qty
FROM orders
INTO OUTFILE '/tmp/orders.csv'
FIELDS TERMINATED BY ','
ENCLOSED BY '"'
LINES TERMINATED BY '\n'

Backup All Databases

mysqldump -n --user=XXXX --password=XXXX --all-databases | gzip -c > server.sql.gz

Dump Data and Structure

mysqldump -u root -p --skip-add-drop-table --replace --skip-extended-insert --lock-tables io85_com | sed 's/CREATE TABLE/CREATE TABLE IF NOT EXISTS/g' > io85_com_full.sql

Dump Data Only

mysqldump -u root -p --no-create-info --skip-add-drop-table --replace --skip-extended-insert --lock-tables io85_com > data_dump.sql

Dump Structure Only

mysqldump -u root -p --no-data --skip-add-drop-table --replace --skip-extended-insert --lock-tables io85_com | sed 's/CREATE TABLE/CREATE TABLE IF NOT EXISTS/g' > schema_dump.sql

Dump Specific Table

mysqldump --no-create-info --skip-extended-insert io85 report_prd_ddd_stacks > dd.sql

Select DB for Import

mysql -u root -p --one-database db_to_restore < fulldump.sql

Extract Database from Dump File

sed -n '/^-- Current Database: `test`/,/^-- Current Database: `/p' fulldump.sql > test.sql

Basic my.cnf

[mysqld]
# Disabling symbolic-links is recommended to prevent assorted security risks
symbolic-links=0
skip_external_locking
#skip-networking
skip-name-resolve
default-storage-engine=innodb

ERROR 2006 (HY000) at line 1: MySQL server has gone away

set global max_allowed_packet=104857600
permanent set in my.cnf 
max_allowed_packet = 128M

Macports

[mysqld]
default-storage-engine=innodb
innodb_file_per_table
innodb_file_format = Barracuda
collation-server = utf8_unicode_ci
init-connect='SET NAMES utf8'
character-set-server = utf8
max_allowed_packet = 128M

[client]
default-character-set=utf8

[mysql]
default-character-set=utf8

Queries

Random Data Generator

INSERT INTO `plug_in_track_prd_location_scans` ( `emply_id`, `dept_id`, `order_id`, `trans_id`, `note`, `m_login`, `c_timestamp`) VALUES
( 11111, (ROUND(RAND() * (24-19) + 19)), NULL, (ROUND( RAND( ) * RAND( ) *9028982 )), NULL, 'ljackson', (NOW() - INTERVAL (ROUND(RAND() * (9-1) + 1)) DAY));

Ucwords for Mysql

DROP FUNCTION IF EXISTS proper;
SET GLOBAL  log_bin_trust_function_creators=TRUE;
DELIMITER |
CREATE FUNCTION proper( str VARCHAR(128) )
RETURNS VARCHAR(128)
BEGIN
  DECLARE c CHAR(1);
  DECLARE s VARCHAR(128);
  DECLARE i INT DEFAULT 1;
  DECLARE bool INT DEFAULT 1;
  DECLARE punct CHAR(17) DEFAULT ' ()[]{},.-_!@;:?/';
  SET s = LCASE( str );
  WHILE i < LENGTH( str ) DO 
    BEGIN
      SET c = SUBSTRING( s, i, 1 );
      IF LOCATE( c, punct ) > 0 THEN
        SET bool = 1;
      ELSEIF bool=1 THEN 
        BEGIN
          IF c >= 'a' AND c <= 'z' THEN 
            BEGIN
              SET s = CONCAT(LEFT(s,i-1),UCASE(c),SUBSTRING(s,i+1));
              SET bool = 0;
            END;
          ELSEIF c >= '0' AND c <= '9' THEN
            SET bool = 0;
          END IF;
        END;
      END IF;
      SET i = i+1;
    END;
  END WHILE;
  RETURN s;
END;
|
DELIMITER ;

Sources

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