Tag: mysql

Assumes there is a text file, “instances.txt” that has the IP or symbolic name of the server where the instances are Just put the query in quotes at the end of the script (such as pasting the below into runonall.sh)

params=$@
           
for i in `cat /home/rbyrd2/bin/instances.txt` ; do echo "$i:  " ; mysql -h $i -N -B -e "$params" ; done  

Various ways to get sizing, counts, etc.

-- Total rows and size for an entire server, excluding system schemata, ordered by size DESC 
SELECT table_schema,table_name,
 CONCAT(ROUND(SUM(table_rows) / 1000000,2),'M') rows,
 CONCAT(ROUND(SUM(data_length) / (1024 * 1024 * 1024),2), 'G') DATA,
 CONCAT(ROUND(SUM(index_length) / (1024 * 1024 * 1024), 2),'G') idx,
 CONCAT(ROUND(SUM(data_length + index_length) / (1024 * 1024 * 1024), 2),'G') total_size,
 ROUND(SUM(index_length) / SUM(data_length),2) idxfrac
 FROM information_schema.TABLES
 WHERE table_schema NOT IN ('mysql','performance_schema','information_schema') 
 GROUP BY table_schema,table_name
 ORDER BY SUM(data_length + index_length) DESC;

-- Total rows and size for an entire server, excluding system schemata, ordered by schema and table name 
 SELECT table_schema,table_name,
 CONCAT(ROUND(SUM(table_rows) / 1000000,2),'M') rows,
 CONCAT(ROUND(SUM(data_length) / (1024 * 1024 * 1024),2), 'G') DATA,
 CONCAT(ROUND(SUM(index_length) / (1024 * 1024 * 1024), 2),'G') idx,
 CONCAT(ROUND(SUM(data_length + index_length) / (1024 * 1024 * 1024), 2),'G') total_size,
 ROUND(SUM(index_length) / SUM(data_length),2) idxfrac
 FROM information_schema.TABLES
 WHERE table_schema NOT IN ('mysql','performance_schema','information_schema') 
 GROUP BY table_schema,table_name
 ORDER BY table_schema,table_name;

-- Total rows and size
 SELECT COUNT(*) TABLES,
 CONCAT(ROUND(SUM(table_rows) / 1000000,2),'M') rows,
 CONCAT(ROUND(SUM(data_length) / (1024 * 1024 * 1024),2), 'G') DATA,
 CONCAT(ROUND(SUM(index_length) / (1024 * 1024 * 1024), 2),'G') idx,
 CONCAT(ROUND(SUM(data_length + index_length) / (1024 * 1024 * 1024), 2),'G') total_size,
 ROUND(SUM(index_length) / SUM(data_length),2) idxfrac
 FROM information_schema.TABLES

-- Database wise report
 SELECT COUNT(*) TABLES, table_schema,
 CONCAT(ROUND(SUM(table_rows) / 1000000,2),'M') rows,
 CONCAT(ROUND(SUM(data_length) / (1024 * 1024 * 1024),2), 'G') DATA,
 CONCAT(ROUND(SUM(index_length) / (1024 * 1024 * 1024), 2),'G') idx,
 CONCAT(ROUND(SUM(data_length + index_length) / (1024 * 1024 * 1024), 2),'G') total_size,
 ROUND(SUM(index_length) / SUM(data_length),2) idxfrac
 FROM information_schema.TABLES
 GROUP BY table_schema
 ORDER BY SUM(data_length + index_length) DESC

-- Database wise report in MB
 SELECT COUNT(*) TABLES, table_schema,
 CONCAT(ROUND(SUM(table_rows) / 1000000,2),'M') rows,
 CONCAT(ROUND(SUM(data_length) / (1024 * 1024 ),2), 'M') DATA,
 CONCAT(ROUND(SUM(index_length) / (1024 * 1024 ), 2),'M') idx,
 CONCAT(ROUND(SUM(data_length + index_length) / (1024 * 1024 ), 2),'M') total_size,
 ROUND(SUM(index_length) / SUM(data_length),2) idxfrac
 FROM information_schema.TABLES
 GROUP BY table_schema
 ORDER BY SUM(data_length + index_length) DESC

-- Engine wise breakup
 SELECT ENGINE, COUNT(*) TABLES,
 CONCAT(ROUND(SUM(table_rows) / 1000000,2),'M') rows,
 CONCAT(ROUND(SUM(data_length) / (1024 * 1024 * 1024),2), 'G') DATA,
 CONCAT(ROUND(SUM(index_length) / (1024 * 1024 * 1024), 2),'G') idx,
 CONCAT(ROUND(SUM(data_length + index_length) / (1024 * 1024 * 1024), 2),'G') total_size,
 ROUND(SUM(index_length) / SUM(data_length),2) idxfrac
 FROM information_schema.TABLES
 GROUP BY engine ORDER BY sum(data_length+index_length) DESC

-- Top 30 tables
 SELECT table_schema, table_name, engine, table_rows,
 CONCAT(ROUND(data_length / (1024 * 1024),2),'MB') AS DATA,
 CONCAT(ROUND((data_length + index_length) / (1024 * 1024), 2),'MB') AS total_size
 FROM INFORMATION_SCHEMA.TABLES
 ORDER BY data_length DESC LIMIT 30

-- List of Full Text Indexes
 SELECT TABLE_SCHEMA, TABLE_NAME, INDEX_NAME, SEQ_IN_INDEX, COLUMN_NAME, CARDINALITY, NULLABLE
 FROM statistics
 WHERE index_type LIKE 'FULLTEXT%' ORDER BY TABLE_SCHEMA, TABLE_NAME

-- The number of columns for each datatype
 SELECT DATA_TYPE, COUNT(*) AS mycount
 FROM `COLUMNS`
 WHERE TABLE_SCHEMA NOT IN ('information_schema','mysql')
 GROUP BY DATA_TYPE ORDER BY mycount DESC

-- The number of columns for each datatype with size (replace my_database)
 SELECT TABLE_SCHEMA, COLUMN_TYPE, count(*) FROM `COLUMNS`
 GROUP BY COLUMN_TYPE HAVING TABLE_SCHEMA = 'my_database'

-- Blob, Float and Double Data types details
 SELECT TABLE_SCHEMA, TABLE_NAME, COLUMN_NAME, ORDINAL_POSITION, COLUMN_DEFAULT,
 IS_NULLABLE, NUMERIC_PRECISION, COLUMN_TYPE, COLUMN_KEY
 FROM COLUMNS
 WHERE DATA_TYPE IN ('FLOAT','BLOB','DOUBLE')
 AND TABLE_SCHEMA != 'mysql'
 ORDER BY DATA_TYPE, COLUMN_TYPE

--All tables with no primary key
use INFORMATION_SCHEMA;
 select CONCAT(t.table_schema,".",t.table_name) as tbl
 from INFORMATION_SCHEMA.TABLES AS t
 LEFT JOIN INFORMATION_SCHEMA.KEY_COLUMN_USAGE AS c
 ON (t.TABLE_NAME=c.TABLE_NAME
 AND c.CONSTRAINT_SCHEMA=t.TABLE_SCHEMA
 AND constraint_name='PRIMARY')
 WHERE t.table_schema!="information_schema"
 AND constraint_name IS NULL;

-- All tables and their primary keys, if exist:
use INFORMATION_SCHEMA;
 select CONCAT(t.table_schema,".",t.table_name) as tbl,
 c.column_name,c.constraint_name
 from INFORMATION_SCHEMA.TABLES AS t
 LEFT JOIN INFORMATION_SCHEMA.KEY_COLUMN_USAGE AS c
 ON (t.TABLE_NAME=c.TABLE_NAME
 AND c.CONSTRAINT_SCHEMA=t.TABLE_SCHEMA
 AND constraint_name='PRIMARY')
 WHERE t.table_schema!="information_schema"
 order by constraint_name;

-- Foreign Key constraints for Database dbName
SELECT A.TABLE_SCHEMA AS FKTABLE_SCHEM, A.TABLE_NAME AS FKTABLE_NAME, A.COLUMN_NAME AS FKCOLUMN_NAME,
 A.REFERENCED_TABLE_SCHEMA AS PKTABLE_SCHEM, A.REFERENCED_TABLE_NAME AS PKTABLE_NAME,
 A.REFERENCED_COLUMN_NAME AS PKCOLUMN_NAME, A.CONSTRAINT_NAME AS FK_NAME
 FROM INFORMATION_SCHEMA.KEY_COLUMN_USAGE A, INFORMATION_SCHEMA.TABLE_CONSTRAINTS B
 WHERE A.TABLE_SCHEMA = B.TABLE_SCHEMA AND A.TABLE_NAME = B.TABLE_NAME
 AND A.CONSTRAINT_NAME = B.CONSTRAINT_NAME AND B.CONSTRAINT_TYPE IS NOT NULL
 HAVING PKTABLE_SCHEM IS NOT NULL
 and A.TABLE_SCHEMA = 'dbName'
 ORDER BY A.TABLE_SCHEMA, A.TABLE_NAME, A.ORDINAL_POSITION limit 1000

Edit to spec as necessary:

DELIMITER $$
CREATE PROCEDURE trimTable()
BEGIN
 DECLARE ROWS INT;
 DECLARE rows_deleted INT;
 SET ROWS = 1;
 SET rows_deleted = 10000;
 WHILE ROWS > 0
 DO
    DELETE FROM db.tabA WHERE predicate_col < CURDATE() - INTERVAL 90 DAY ORDER BY `id` LIMIT 10000;
    SET ROWS = ROW_COUNT();
    SET rows_deleted = rows_deleted + ROW_COUNT();
    SELECT rows_deleted AS "Rows Deleted";
 END WHILE;
END $$
DELIMITER ;