How many tables can be created in a mysql database? - mysql

How many tables can be created in a mysql database ?
And how many columns can be created in a mysql table ?
How many rows can be inserted into a mysql table ?

How many tables can be created in a mysql database ?
MySQL has no limit on the number of databases. The underlying file system may have a limit on the number of tables. Individual storage engines may impose engine-specific constraints. InnoDB permits up to 4 billion tables.
And how many columns can be created in a mysql table ?
There is a hard limit of 4096 columns per table, but the effective maximum may be less for a given table. The exact limit depends on several interacting factors.
How many rows can be inserted into a mysql table ?
The number of rows is limited by the maximum size allowed for a table. This is OS-dependent. You can impose a limit on the number of rows by setting MAX_ROWS at table creation time.
Reference: Limits in MySQL

It really depends on the operating system and version of MySQL. Generally the MySQL file size for tables can be: (5.0 Version)
Operating System File-size Limit
Win32 w/ FAT/FAT32 2GB/4GB
Win32 w/ NTFS 2TB (possibly larger)
Linux 2.2-Intel 32-bit 2GB (LFS: 4GB)
Linux 2.4+ 4TB(using ext3 file system)
Solaris 9/10 16TB
MacOS X w/ HFS+ 2TB
NetWare w/NSS file system 8TB
For more information check http://dev.mysql.com/doc/refman/5.0/en/table-size-limit.html

Unlimited.
4096 columns.
Number of row limit is unknown to me.
See for example http://dev.mysql.com/doc/refman/5.0/en/column-count-limit.html.

Hard cap 4096 columns, but my experience: try not to use VARCHAR, use TINYTEXT.
Otherwise, you will easily reach limit "65,535-byte row size limit" even though you have less than 50 columns in the table.

Maximum row size allowed is 65535 bytes

Related

Addressing issue of MySQL table size limit

I have a table with huge amount of data and very frequently added rows.
If in future, table size limit reached then how to handle this problem? What is the maximum size of MySQL database table?
If in future, table size limit reached then how to handle this
problem?
You could use partitioning
https://dev.mysql.com/doc/refman/5.7/en/partitioning.html
What is the maximum size of MySQL database table?
The effective maximum table size for MySQL databases is usually
determined by operating system constraints on file sizes, not by MySQL
internal limits. For up-to-date information operating system file size
limits, refer to the documentation specific to your operating system.
source https://dev.mysql.com/doc/refman/5.7/en/table-size-limit.html

What to do if my mysql database total rows exceeds 65535?

What to do if my mysql database table total rows exceeds 65535?What type of database can i use inorder to store more data?
As the documentation says
The effective maximum table size for MySQL databases is usually determined by operating system constraints on file sizes, not by MySQL internal limits.
As # D-side points out the number of rows depends on the engines used.
For example
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.
Please check here and herefor more details..Hope it helps

Mysql no. of data

Does mysql have any datarows limit.
I mean there's gotta be a limit somewhere, or maybe just a limit for a user.
Anyone knows if there is a limit for a user?
Yes there is a limit (Actually there are a few).
The file size of your filesystem. Since MySQL (all engines) stores the table in a maximum of 1 file (InnoDB can store multiple tables in one file), the filesystem's file size limit will be restrictive of how many rows you can have. Now, if you're using a modern filesystem, it won't be too bad. See this list for more information: Comparison of filesystem limits.
The row pointer in the storage engine (MyISAM for instance is 6 bytes by default, 7 bytes max). Granted, these numbers are huge (256TB default, 65,536TB max for MyISAM), but they are there.
Data type of your primary key. If you use INT, you're capped at 2.1 billion rows (4.3 if you used unsigned). If you used a BIGINT, you're capped at 9.2x10^18 rows (18.4x10^18 if unsigned). Of course this doesn't apply to tables without an auto-incremeneted PK.
InnoDB's maximum tablespace size is 64TB, so that's the max table size in Inno.
There may be more, but that's what I can think of...
Check out this documentation page for more information...
As far as I know, there is no row limit as such, and there definitely is no per-user limit - it would not make sense in a database system.
See E.7. Limits in MySQL in the manual and the duplicate link I posted.

How much amount of data can be store in MyISAM DB?

How much amount of data can be store in MyISAM DB?
Can you Guys Says How Much TB?
A lot within these limits:
http://dev.mysql.com/doc/refman/5.1/en/limits.html
Also from manual
http://dev.mysql.com/doc/refman/5.0/en/myisam-storage-engine.html
There is a limit of 2^32 (~4.295E+09) rows in a MyISAM table. If you build MySQL with the --with-big-tables option, the row limitation is increased to (2^32)^2 (1.844E+19) rows. See Section 2.17.2, “Typical configure Options”. Binary distributions for Unix and Linux are built with this option.
Just for fun: You can have 65536 bytes per row. This means you can create 5461 LONGTEXT/LONGBLOB columns, each able to store 4GB of data. Now multiply that times 2^64...
That's strictly theoretical number though.

Maximum Row in DBMS

Is there any limit to maximum row of table in DBMS (specially MySQL)?
I want create table for saving logfile and it's row increase so fast I want know what shoud I do to prevent any problem.
I don't think there is an official limit, it will depend on maximum index sizes and filesystem restrictions.
From mySQL 5.0 Features:
Support for large databases. We use MySQL Server with databases that contain 50 million records. We also know of users who use MySQL Server with 200,000 tables and about 5,000,000,000 rows.
You should periodically move log rows out to a historical database for data mining and purge them from the transactional database. It's a common practice.
There's probably some sort of limitation, dependent on the engine used and the table structure. I've got a table with appx 45 million entries in a database I administrate, I've heard of (much) higher numbers.