MYSQL :: How To Lock A Max ID From Being Read

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Lock A Row
I have multiple users who can click on a record and do an update to the record in a mysql table. How can I make sure that when a record is being updated, another person cannot access it for update. I think this may be done on locking the record on a record level in mysql. Or some other method? Can someone give me a helping hand?

Can Not Lock
We were unable to lock a test table on your MySQL database server. We tried locking a table with the command LOCK TABLES _install_test WRITE and MySQL reported the following error: Access denied for user 'test'@'%' to database 'horlick'.
how to grant access for the command LOCK TABLES then?

Read-only Tables
Is there a way to mark a table as read-only (after inserting some initial data, of course)?
I'd like to do it for optimization reasons - hoping that mysql could take advantage of the knowledge it's read-only, for caching, etc.

Read From MySQL
I installed appache server and php and work great..

But i cant read data from my sql .

I use this code to connect to connect to mySQL
server:localHost
username:root
password: ****

// Connect to the database server
$dbcnx = @mysql_connect('localhost', 'root', 'password');
if (!$dbcnx) {
die( '<p>Unable to connect to the ' .
'database server at this time.</p>' );
}
...
......
Should i create another account in mySQL? .or the php can not communicate with mySQL ?''

How Do I Read The Log-bin File?
Does anyone know how to read the binary log from a client workstation?

The log is named hostname-bin.001 and when I open the file it is unreadable (obviously because it is in binary). So making a shortcut to that file will not do the trick.

How can I open the file via a mysql command prompt on a client PC?

Read Default Value
I have table with simple data. all of fields have default value

how to read this default value, using php

How To Read Log Files
I running on Win2K3 and need to know the basics of mySql system health logs (their location, their expected contents and format) and any other logs that might help track down problems when mySql crashes. I've seen that it will log EventViewer events and that within the C:Program FilesMySQLMySQL Server 5.0data directory there are some logs.

I've been able to read the .err log since it's text but the other logs are binary. Do I have to use a cmdline app within the mySql distriubtion to read the binary files? Or, is this a well documented format and there are several 3rd party utilities out there that will parse/display these logs.

In general, where does mySql maintain its log files, does it generate separate log files per database and what are some common applications that I need to get familiar with to view the contents of these files?

Table Is Read Only
I've upgraded a server from RHEL4 to RHEL5, and in the process gone from 4.1 to 5.0. I copied over all of the database files, adjusted permissions, and ran mysql_upgrade. It's a very simple application that needs no security, so it's running without passwords.

The application works fine reading, but will not write to the table:

[root@chekov etc]# ip_age_off_autoblock
iptables: Bad rule (does a matching rule exist in that chain?)
iptables: Bad rule (does a matching rule exist in that chain?)
DBD::mysql::st execute failed: Table 'addresses' is read only at /usr/local/scri
pts/ip_age_off_autoblock line 47.
Unable to execute at /usr/local/scripts/ip_age_off_autoblock line 47.

I've tried granting privleges to anonymous users:

mysql> grant select,insert,update,delete,create,drop,references,index,alter on *.* to '';

to no avail. Absolutely nothing shows up in the log file.

Read Out An AUTO_INCREMENT-ed Value
The first column of my table is AUTO_INCREMENT. I fill my table with 5 records with a blanco value in their first field. The first column of my table will then hold the values 1,2,3,4,5 (top>down).

Then I erase those 5. Then I add a new record with a blanco first value. It will get number 6.

My problem in this scenario:

I want to read out this number 6 before I will insert that record. Is that possible?

How To Read Phpbb
php file is loaded as codes on windows, but when u upload it on web u get the codes showed as image and stuff, so my question is, when using local host (windows xp) what prog or how i can see the php files not as codes/source when opening but as image or table or whatever.

Table Is Read Only
i transfer my mysql database in windows into linux by copy and paste it.when i want to update table record,it promt an error msg:

Error Code : 1036
Table 'ardi02' is read only
(2 ms taken).

Read Only Tables
I log on as a user who has select, insert, update, delete privilegies but when i'm trying to for example insert row in my table myadmin reports me that the table is read only. where can I as a root change this and what are the options?

Read The .err File
Working on installation in Mac OSX 10.4. Need to read the .err file, but don't know how to find it. If you can help, please show the path from from the 'top' i.e. /usr/local/mysql/ and the rest of the path.

Table Is Read Only
I backed up my tables, formated my computer, and reinstalled. Then I reinstalled mysql and capied the files back in. Now every time I try to do any table operations. I get "Table is read only". So I tired palying with the file permissions.. They are rw for user and group.. and they are all owned by mysql and the mysql group.

MySqlDataReader.Read()
Then you ask the Mysql .Net Connector Reader to Read forward is it moving a server side cursor forward?
Or is it just moving forward in a cache of the query result that is already on the client?
I assume(hope) it is the latter but just asking.

Can't Read Dir Of './mysql/'
I am currently using MySQL under Mandrake Linux 10.1 and have an error (see the title).
I have an error message when I want to see All the databases into my Server. I am using PHPMyAdmin.

Read In A .sql File
I have a large SQL file that contains a bunch of create table statements.How do I get mysql to read in this file and process the sql. =20.I am not thinking load data infile because it isn't text

Lock In MySql
I am a beginners user of mysql. I have created a DB with table type=MyISAM. Now I want understand how work locks in MySql. But I have problems.

I open a copy of the client/SQL and run:

"LOCK TABLES tablename WRITE"
In a second copy of the client/SQL I run:
"UPDATE tablename SET field=999 WHERE fieldkey=1"
Surprise!!! I hope that the "UPDATE" operation don't work , because the table is locked, but the record is update correctly (the lock don't work).

What is my error?

Lock On Table
If I do:

1) mysql_query('LOCK TABLE tablename');

2) mysql_query('SELECT * from tablename where condition=0');

3) if (cond) {

4) mysql_query('UPDATE tablename SET condition=1 WHERE condition=0');

5) }

6) mysql_query('UNLOCK TABLE tablename');

Record Lock
I can't seem to find an answer in the literature, but is it possible in 4.1 to place a lock on a particular record? Say, to prevent changes to the record while being viewed.

There's plenty on table locks but no record locks. Are these not supported?

Lock Tables
I need to lock some of my tables for a while with lock tables. However I find how the READ and WRITE locks is implemented in the MyISAM storage engine a little odd. When obtaining a READ lock all updates are prevented, including writes from the thread obtaining it. WRITE locks gives exclusive access to the issuing thread.

However what I want is to give read and write priveleges to one thread and read priveleges to all other threads, and I can't figure out how to obtain this effect with lock tables... Is it even possibel?

Orphaned Lock
I am using INNODB tables in MySQL. One thread dies while having a lock on a row. That row is now locked permanently as far as the application is concerned. No other thread can update the values in that row. Is there a command I can issue (either internal to the application or external) that will free that row up to allow updates to occur again?

Lock Table?
I run two perl scripting programms simultaneously to collect some
information on internet, and insert the collected data into the same mysql
table (just one table). i was wonder if i need to lock this table when one
scripting programm inserts data, or it really does not matter in this case.

Delayed Lock
http://dev.mysql.com/doc/refman/5.1/en/insert-delayed.html mentions, "delayed lock" but does not explain what it is or how it works. I have searched, but cannot find it in the docs. Does anyone have more information?

4.0.15 Lock Timeout
I'm running the same application on 4.0.1-alpha-win and 4.0.15-win.
Under 4.0.15 I run the same test client as I run against
4.0.1-alpha-win. The behavior is different. In particular, 4.0.15
produces a "Lock wait timeout exceeded; Try restarting transaction"
which does not occur under 4.0.1-alpha-win.

All tables are innoDB.
No "SELECT...FOR UPDATE" is being done.
transaction isolation level is SERIALIZABLE.
Many Selects go through.
The first update hangs, then I get the lock timeout exception.

I don't think the behavior is correct since this code works fine under
4.0.1.

Has anyone else seen unexplained waits on update? If I had done a
SELECT...FOR UPDATE, then I could understand that the wait might be
caused by an uncommitted transaction that performed the SELECT...FOR
UPDATE.

Lock Question
I know that in the pro edition the InnoDB has a row-level locks and I wanted to know if there is any protection ( lock or something like that ) in the classic edition as well.

I want to know this beacuse I want to know if 2 of my applications are trying to access the same data at the same time will I get an error of some sort or will mysql will make a queue of some sort and answer one at a time.

Lock Tables &
is it good to lock the tables before we start a transcation? or the starting of the transcation will auto lock the tables?
if it is good to lock the tables before the start of a transcation, how should i process the queries? which query should i start first and end last?

Table Lock
I'm writing a backup script for my database. I use SHOW KEYS and SHOW FIELDS to have the information I need to write the INSERT and CREATE inctruction, but after using show intructions I have my tables as if they were locked. If I try to drop a table I have this message bacK: Error on delete of '.Borghicategorie.MYI' (Errcode: 13).

LOCK Error
Why am I getting this msg before every command in sql backup file while running mysqldump. it only dumps one insert query from each
table..

LOCK TABLES `table1` WRITE;
/*!40000 ALTER TABLE `table1` DISABLE KEYS */;

LOCK/UNLOCK
I am quite confused whether as to use table locking in my custom foryum app (writing locks of course).
When I have 2+ interdependent UPDATE/INSERT queries, locking (write lock) can be suite effective as to assure everything has gone ok (no other insert/update queries on the records we are updating in between the updating process).
I know VB doesn't use locks. Why??
Please give me your opinions on the subject

LOCK TABLES
i was wondering if I run the following query:

LOCK TABLES table_name

Will it lock for reading, writing or both

Lock Records
I need to know how to lock single records in a table. I have multiple users
logging on to a web site. I need to keep them from changing data on a
record at the same time.

No Lock On Update
if it is possible to force a table to be unlocked during an update of a HEAP table?

Not Allowing To Read Files
I have program with data accessed by MySQL. In my assume, I copy program and its data files to my friends, and they run program with pleased faces. And now, the first friend wants to delete all program related data files and copy program related data files from second friend(or he can also get any program formatted data files) and save them into data folder. My problem: the first friend can run program with only my data files; he can get any data files from anywhere and save them into data folder, but program won't be allowed to read these data. Does everyone have some good ideads?

Read Size Of Field
Given a table like this, where X can be any size:

table {
name int(X)
}

Is it possible to get the value of X?

MySql Write Vs Read
Essentially I am faced with a design choice;

have an oft run (modifiable) query run every time any user wants to
run it, comparing criteria againt each and every user in the table and
delviering list OR saving that list (user/user/) so the next time all
that needs to be queried is the existence of a record in the table.

The basic tradeoff; version 1 there are many simultaneous queries of
the user db on complex search criteria; version 2 there are fewer but
their are as many far more simple queries to a much larger table, not
to mention many writes to same to keep the table current.

I know this is pretty vague, but I was wondering if in general there
is an area that mysql excels in vis a vis complex query smaller tables
simple query larger tables.

Question 2 is there anyway to guestiate the search/write times of a
user log in to both query and update? #Records, fields, etc? I'd like
to keep log in to < 10 seconds max.

Coding A Forum To Read On A CD
I have a fairly large ubb that I would like made available on CD. Is it possible to do this?

Creating Read Only User
When looking over the instructions for phpMyAdmin they want a read-only user. What GRANT permissions do I need to assign so a user has just read-only rights?

Write Once Read Many Field
I am designing a database and one of the requirements my client has is that once data is entered into certain fields it cannot, under any circumstances, be changed. Is it possible to create a write once read many (WORM) field in MySQL directly?

Read-only TIMESTAMP Field
I need a table with TIMESTAMP field which must be always set to a CREATE server time (so the == CURRENT_TIMESTAMP).

How do I make it read only? I.e. make user unable to override the default value (CURRENT_TIMESTAMP) on CREATE and UPDATE. Is it the Q of user permissions? If yes, how to set 'em correctly to allow create/update but allow only to read timestamp?

First Field Isn't Read Using SELECT
I am trying to gather information from a dbase, displaying it as I go. The script works fine except the first field that matches the criteria isn't read or displayed.

For example:

On this page I check to see if a session variable 'tripNumb' is set. If it isn't, it goes to the dbase and gets the last trip number and adds one to it. The problem is that if there is only one field in the dbase it doesn't read it. Code:

Can SQL Read From A File Or List
I'd like to do a select statement that would substitute variables from a file containing a list of strings, or a list of strings right on the command line. Here's my pseudo code:

SELECT {some value from my list, table or whatever} FROM {some list of tables in a file or other table etc}..

Read Ibdata1 Or Ib_logfile1
Is there a way to read the ibdata1 or ib_logfile1 files? I'm looking for some information. It doesn't have to be complete but wanted to take a look. It's all binary right now and wondered how to convert to .txt or something that i can read.

Read Primary Key While Entering A New Row
I have a website with a form on it.  Upon pressing submit, the information gets entered into the database on a new row.  Each row is numbered with auto_increment (it's the Primary key).  The auto_incremented field is called the ID.

When the user submits his information, I would like an automatic email to get sent to his email with his unique ID number and a recap of this information.  How can I do this?

Basically it seems to me that all I need to know is the command to be able to read information off of the row that you're currently putting information on.  The only way I can think of to do this is to have the form input all the information, then close that connection and start a new one in which it searches for the row that contains all that information and that way I can get it to read the ID then.  Is there a shorter way?

Read Or Convert 5.0 Database To 4.0 Or 3.0
using 5.0 - is there a way to attach remotely to 5.0 databases with a 4.0 or 3.0 client - or is there a way to convert 5.0 databases to 4.0 or 3.0 format?

Table Is Read Only Error
We recently started using MySql as the db behind some java and cold fusion applications. A couple times we've gotten an error that says the table is read only. Stopping services and closing all open sessions does not correct the problem.

We use Mysql Control Center as our GUI, and the repair functions there also give us the same error. The only thing that seems to work is rebooting the server. Anyone run across this before?

How To Read A File Into Mysql
i have created a output file from oracle which contains insert statements like

insert into tms.tms_rem_exclusion_list values (3337)
insert into tms.tms_rem_exclusion_list values (4175)
insert into tms.tms_rem_exclusion_list values (4227)

iam new to mysql and someone told me that if i create such a file
i can import this data into the mysql table at the mysql prompt

like
mysql> tms_rem_exclusion_list < test.sql; (name of the above file)

but iam getting this:

ERROR 1064: You have an error in your SQL syntax. Check the manual that corresp
onds to your MySQL server version for the right syntax to use near 'tms_rem_excl
usion_list < test.sql' at line 1

first of all i am not sure where to keep the test.sql file ie in which directory
so i kept it under the scripts folder.