I want to store arraylist of User object.It's size is about 50,000, means 50,000 users.
So will it be possible to store into mysql.? upto how much limit i can store data into mysql.?
Mysql Scalability and Limits
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.
Support for up to 64 indexes per table (32 before MySQL 4.1.2). Each index may consist of 1 to 16 columns or parts of columns. The maximum index width is 767 bytes for InnoDB tables, or 1000 for MyISAM; before MySQL 4.1.2, the limit is 500 bytes. An index may use a prefix of a column for CHAR, VARCHAR, BLOB, or TEXT column types.
Also check these links-
http://dev.mysql.com/doc/refman/5.7/en/features.html
http://www.heidisql.com/forum.php?t=672
Related
We have web-based app in production with thousand of users. We analyzed embedded DBs and while reading about data storage capacity of mySQL, we come across this
Each individual table should not exceed 1 GB in size or 20 million rows
My requirement is to store BLOBS in 1 table of my mySQL DB.
If the storage capacity of mySQL is only 1 GB, then my DB will crash in production because my blobs quickly occupy 1 GB?
I don't know where you read that an individual table should not exceed 1 GB or 20 million rows. Those are definitely not size limits for MySQL tables.
See my answer in Maximum number of records in a MySQL database table
You will fill up your storage before you reach the maximum table size MySQL supports. In other words, there is no storage that exists today that is larger than the limit of a MySQL InnoDB table.
That said, there are recommended size limits. For example, if you let a table grow too large (e.g. 1TB), it will take days to do a schema change or an optimize table.
At my work, we recommend to the developers that they should keep tables under 500GB, and we warn them if it goes over 1TB. Because the larger the table gets, the harder it is to complete certain operations tasks (defragmentation, backups, restores, schema changes, etc.).
There's no specific limit or threshold, it's simply that "the bigger it is, the more time it takes."
This is true for anything that runs on a computer — not just MySQL and not just databases.
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
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
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 many records can a MySQL MyISAM table store? How many InnoDB can?
You can't count by number of records because your table can have really short records with only a few int fields or your records might be really long with hundreds of fields.
So it has to be measured in the file size of the tables.
For MYSQL: The table size limit is based on the operating system drive file system that MySQL is installed on, ranging from 2GB to 2TB.
See the MySQL reference manual for full explanations of limits for each operating system.
Concerning InnoDb and MyIsam i do not know.
From the MySQL site:
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.
The more practical limit will be the size of your key -- if your primary key is an int field, then the max number of rows will be the largest number that can be held in an int.
So if you're expecting a big table size, use bigint ... or something even bigger.