Hi,
Using the C API, does the sql parameter in the mysql_query function a length
limit?
Thank u very much,
Edilson.
Edilson Vasconcelos de Melo Junior
www.jrsoftwares.com.br
[EMAIL PROTECTED]
Fone: (19) 3256-3577
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Sent: Friday, May 10, 2002 3:41 PM
To: MYSQL
Subject: Length Limit
Hi,
Using the C API, does the sql parameter in the mysql_query function a length
limit?
Thank u very much,
Edilson.
Edilson Vasconcelos de Melo Junior
www.jrsoftwares.com.br
[EMAIL PROTECTED]
Fone: (19
In the last episode (Oct 23), Jeremy Zawodny said:
On Mon, Oct 22, 2001 at 11:42:23AM -0600, Steve Meyers wrote:
If you use a good 64-bit hash, I doubt you'll run into any
uniqueness problems. MySQL will support that as a 64-bit BIGINT.
You especially should not have any problems if you
Steve Meyers wrote:
In a previous message, I failed to mention one of the main reasons you
would NOT want to use a 500-character primary key. MySQL uses a key
buffer to keep as much index information in memory as possible. The
longer the key, the less info it can keep in memory, and
On Mon, Oct 22, 2001 at 11:42:23AM -0600, Steve Meyers wrote:
If you use a good 64-bit hash, I doubt you'll run into any
uniqueness problems. MySQL will support that as a 64-bit BIGINT.
You especially should not have any problems if you hash each column,
then do the primary key across the
At a previous job, we tested a 32-bit hash function by running it
against hundreds of thousands of unique URL's stored in our
database. We found one collision. A 64-bit hash is billions of
times better (4 billion, to be exact).
Good to know. I wonder how many collisions I'd find if
At a previous job, we tested a 32-bit hash function by running it
against hundreds of thousands of unique URL's stored in our
database. We found one collision. A 64-bit hash is billions of
times better (4 billion, to be exact).
Good to know. I wonder how many collisions I'd find if
Steve Meyers wrote:
At a previous job, we tested a 32-bit hash function by running it
against hundreds of thousands of unique URL's stored in our
database. We found one collision. A 64-bit hash is billions of
times better (4 billion, to be exact).
Good to know. I wonder how
I am not understanding why having a hash and the full url in the
database would not take care of the collisions. Even if you had
10 collisions for a 16 bit hash (say), if your query was:
SELECT ... WHERE hash=thehashvalue AND url='theurl' you would get
very fast lookups on the hash and
Hi!
I changed now ha_innobase.h so that InnoDB allows
keys up to 7000 bytes in length. The change will be
in MySQL-3.23.44 and 4.0.1.
Regards,
Heikki
http://www.innodb.com
Steve Meyers wrote:
At a previous job, we tested a 32-bit hash function by running it
against hundreds of
On 23-Oct-2001 Steve Meyers wrote:
At a previous job, we tested a 32-bit hash function by running it
against hundreds of thousands of unique URL's stored in our
database. We found one collision. A 64-bit hash is billions of
times better (4 billion, to be exact).
Good to know. I
Steve Meyers wrote:
The problem is that he has it as a primary key, so he wants it to be
unique as well as indexed. The best solution (and MUCH MUCH MUCH
more efficient) would be to hash each of the four columns, and create
a primary key on that. Integer keys are much faster and
The problem is that he has it as a primary key, so he wants it to be
unique as well as indexed. The best solution (and MUCH MUCH MUCH
more efficient) would be to hash each of the four columns, and create
a primary key on that. Integer keys are much faster and memory-
efficient
keys.
Steve Meyers
-Original Message-
From: Chris Bolt [mailto:[EMAIL PROTECTED]]
Sent: Saturday, October 20, 2001 8:31 PM
To: [EMAIL PROTECTED]
Subject: RE: Length limit of 500 on primary keys?
Is there a way to raise this limit? We have some tables with
columns
Why is there a limit of 500 bytes on the primary key? (MySQL-Max-3.23.43 on
WinNT).
Is there a way to raise this limit? We have some tables with columns that
are VARCHAR(200), and need to make a primary key based on combinations of
these columns (in some cases, upto 4 columns), and MySQL
Is there a way to raise this limit? We have some tables with columns that
are VARCHAR(200), and need to make a primary key based on combinations of
these columns (in some cases, upto 4 columns), and MySQL complains for all
of these table definitions that Specified key was too long. Max key
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