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.
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.
I have the below data that I am caching in Python now:
id timestamp data-string
The data-string size is ~87 bytes. Storing this optimally in python (using dict and having the timestamp pre-pended to the data-str with delimiter), the RAM costing per entry comes to ~198 bytes. This is quite big for the size of the cache I need.
I would like to try out storing the same in MySQL table, to see if I can save on RAM space. While doing so, I store this as:
id timestamp data-string
4B 4B
<---- PK ---->
I understand that MySQL will load the index of the InnoDB table (that's what I have now) into RAM. Therefore, the id (unique), timestamp and a pointer to the data-string will reside on RAM.
How do I calculate the complete RAM usage (ie including the meta-data) for the B+Tree of MySQL only for this new table?
There are so many variables, padding, etc, that it is impractical to estimate how much disk space an InnoDB BTree will consume. The 2x you quote is pretty good. The buffer_pool is a cache in RAM, so you can't say that the BTree will consume as much RAM space as disk did. Caching is on 16KB blocks.
(#ec5 has good info on the current size, on disk, of the index(es).)
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.