Find Table with maximum number of rows in a database in mysql
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As the question title suggests, I want to find the table having maximum number of rows (entries) in a particular database. I have been able to extract the names of all the tables in a particular database using the query below.
SELECT TABLE_NAME FROM information_schema.tables WHERE TABLE_SCHEMA="Some_Database";
How do I proceed beyond this?? I have been trying to formulate a nested query for the above purpose but couldn't come up with something (I am not very comfortable with them). Please Help.
EDIT: As given in this link the table_rows field does not give an accurate result. That is why I need to do something like a
MAX (Count(*)) for each table.
Try this one......
SELECT TABLE_NAME,MAX(TABLE_ROWS) FROM information_schema.TABLES WHERE TABLE_SCHEMA = "DB_Name";
please try the following two queries for actual result.
SELECT CONCAT('SELECT COUNT(*) as cnt FROM ', table_name, ' union all') FROM information_schema.tables WHERE table_schema = 'your_db_name';
select max(cnt) from (paste the result of first query and remove last union all keyword) as tmptable;
List 10 largest tables in MySQL database, This query returns list of ten largest (by data size) tables. Query. select table_schema as database_name, table_name, round( (data_length + index_length) MySQL has hard limit of 4096 columns per table, but the effective maximum may be less for a given table. The exact column limit depends on several factors: The maximum row size for a table constrains the number (and possibly size) of columns because the total length of all columns cannot exceed this size.
What about this:
SELECT TABLE_NAME FROM information_schema.TABLES WHERE TABLE_SCHEMA = "Some_Database" ORDER BY TABLE_ROWS DESC LIMIT 1;
MySQL Select the nth Highest Record in a Database Table, SELECT * FROM (SELECT * FROM table_name ORDER BY column_name ASC LIMIT N) AS tbl ORDER BY column_name DESC LIMIT 1; Fortunately, MySQL provides us with the LIMIT clause that constrains the number of rows in the returned result set. In InnoDB, with a limit on table size of 64 terabytes and a MySQL row-size limit of 65,535 there can be 1,073,741,824 rows. That would be minimum number of records utilizing maximum row-size limit. However, more records can be added if the row size is smaller .
information_schema.tables has a column named
SELECT table_name FROM information_schema.tables WHERE table_schema = 'Some_Database' ORDER BY table_rows DESC LIMIT 1;
What is the maximum number of rows in a mysql table?, Originally Answered: What is the max rows a MySQL database can store per How do you select all records from several tables in one query (PHP, MySQL, Finding total number of rows in a table We can get the number of rows or records present in a table by using mysql_num_rows() function. That’s a tricky one…. On MySQL Database, we can get number of rows from each table in a database by using query = SELECT table_name, table_rows FROM INFORMATION_SCHEMA.
We can obtain the table name having max number of rows in MySQL using the this query
SELECT TABLE_NAME,MAX(TABLE_ROWS) FROM information_schema.TABLES WHERE TABLE_SCHEMA = 'DB_Name' GROUP BY TABLE_NAME ORDER BY MAX(TABLE_ROWS) DESC LIMIT 1;
SQL: Find out number of rows of all tables within a MySQL database , SQL: Find out number of rows of all tables within a MySQL database. Here you are: Copy. SELECT table_name, table_rows FROM INFORMATION_SCHEMA. The MySQL MAX() function is an aggregate function that returns the maximum value from an expression. Typically, the expression would be a range of values returned as separate rows in a column, and you can use this function to find the maximum value from the returned rows. If there are no matching rows, MAX() returns NULL.
8.4.7 Limits on Table Column Count and Row Size, The maximum row size for an InnoDB table, which applies to data stored locally within a database page, is slightly less than half a page for 4KB, 8KB, 16KB, and Apply the above syntax in order to get the count of records for all tables. The query is as follows − mysql> SELECT SUM(TABLE_ROWS) ->FROM INFORMATION_SCHEMA.TABLES ->WHERE TABLE_SCHEMA = 'business'; The following table returns the count of records.
12.5 Limits on Table Column Count and Row Size, The maximum row size for an InnoDB table, which applies to data stored locally within a database page, is slightly less than half a page for 4KB, 8KB, 16KB, and To count the total number of tables, use the concept of count (*) with table_schema. First, to check how many tables are present in our database “business”, we need to use the ‘show’ command.
MySQL 8.0 Reference Manual :: 8.4.6 Limits on Table Size, The effective maximum table size for MySQL databases is usually determined by The server uses these options to determine how large a table to permit. case, MySQL cannot optimize the space required based only on the number of rows. I have a table that we are using this month for the first time. The table is a bit larger than pretty much all our other tables in use now. We have the table set to archive off at the end of each month so no other records are written to it. I noticed that our 08/31/05 archive had exactly 199,000 rows.