Heap Vs Temporary Tables
Is the only difference between Heap and Temporary table types being that
Temporary table types are dropped when the connection is closed?
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Temporary Tables
since a couple of days I am struggling with temporary tables. there is not much info on this subject in manual.I have the following situation: two 'perl' routines sub 'a{}' and sub 'b{}'. Sub 'a' creates temporary table and is inserting data into it. Sub 'b' was supposed to get data from temporary table created in sub 'a{}' but all I get is error message that table does not exists.is it possible to dump table between routines not cutting off session with db? There can be found in manual that temporary tables exists till session with database will not be terminated. What can be a possible reasons of my problems with access to temporary table?I am neither perl guru nor mysql. I am using BugTrack framework to add some customizations and can't get over this temporary tables.
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Temporary Tables With AJAX
I have been busting my head with a problem, that goes like this: 1. with a first ajax call to the server(apache 2.0 + php), I create a temporary table like this: create temporary table peter select * from some_table limit 0,0; That creates an empty temporary table with the same structure as some_table. I use mysql 4.023. I use php call mysql_connect to connect to the mysql database. 2. I create a second ajax call to the server using the same mysql_connect call with the third parameter new_link set to false and make this query: select count(*) as 'count' from peter; This time I receive an error that this table does not exist. Any ideas on where a problem could lie?
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Privileges For TEMPORARY TABLES
I have been developing an application on Windows with MySQL 3.23, making use of temporary tables.Now when I try to port the application to a Unix box runningalso MySQL 3.23, I keep running into "access denied" errors with the queries which employ temporary tables. This only happens with CREATE TEMPORARY TABLE type queries, all other queries work fine.I have given my user all privileges (CREATE, ALTER, INDEX, DELETE) to the database yet still it can not create temporary tables. Is there a special command for allowing temporary tables on MySQL 3.x ?
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Temporary Tables In MySQL (using Php)
I have the following problem: I have a switch with case 0, 1 and default. in case 0 I create a temporary table where I insert data then. When I get to the case 1 in my switch, I want to make a select(*) on this data in the tmp table, afterwards I delete all data in the table and insert the select from before... But when I do this I get always the tmp table does not exists. But when I do a select on it it works.. Any knowledge about, why it doesn't work? To descibe the thing a little better: ....
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Temporary Tables Not Disapearing
I have a 5.0.22 server. I've been useing it for +- a week now and I see more and more temp(I think) tables being created. The names of these tables are something like A000000c05280lucy and B0000b0d03924shaldine. Is this temp tables and if they are why are they not deleting? I also see that my indexes in my tables are now table, my old tables are still the same. eq I have a index in one of my tables called WKey. I now have a new table called WKey and under rows it says "Index" and fields it gives "3".
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Indexing Temporary Tables
In my application, I create a temporary table like so... CREATE TEMPORARY TABLE hits SELECT ... This is nice because I don't have to explicitly declare the column names or types. However, I would like to index at least one of the columns to speed things up a little. I have only been able to find two ways to do so (1) explicitly provide column definitions and indexes before the select (this worked, at least when I specified a single column primary key; and (2) to issue an ALTER TABLE statement after the creation and population of the table. I was curious what the implications of (2) are: I read in the documentation that for *non-unique* keys its actually faster to disable the keys before insertion. However, in my case the main key of interest will be a unique key (I may add other non-unique keys later). In the case of a unique key, will adding the indexes later via an ALTER TABLE statement be faster, slower, or approximately the same as adding it to the table as a part of the CREATE TEMPORARY TABLE statement? Am I right in assuming that for non-unique keys it is actually faster?
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Alternative To Temporary Tables
I have a large query with two subquery within it that access the same table bu t have diff where clause. So i created a table first that runs this query once and has the result. Then use this table in the two subqueries to get the result. In this way i need to run the query just once and the performance is greatly improved. I drop the table immediately after the large query is run. But my problem is this table is visible across all db connections. So if someone double clicks on the grpah that triggers these queries, this table will be visible and that might create problems since the two clicks will trigger the create table again. I tried using temp tables since they are local to one connetcion, but they cannot be used more than once in a query. SO I could not use them.
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Privileges On Temporary Tables
at the momente I'm having the following problem: I have a DB user that should not be able to access all the tables in the database. Now I also want to allow him to create temporary tables which already works fine. The problem is that I can't SELECT from the table without granting the select privilege to my user on the whole database. What's the best way to circumvent this problem?
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Connections, Temporary Tables And PHP
An application is built using 2 or more scripts (on different files) that connect to mysql using the mysql_pconnect function. If I create a temporary table in the first script and then navigate to the second (for example, by submiting a form), would the temporary table persist between the first and second script? Can I access the temporary table from the second script or it would be dropped?
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List Temporary Tables
Maybe this question was already answered, but I didn't found it vis "Search".. :) To show all tables except temporary I can use "SHOW TABLES"... But how do I show all tables or at least temporary tables? I can't believe that there's no such function!
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Join Optimization & Temporary Tables
--B_3141046513_16095154 Content-type: text/plain; charset="ISO-8859-1" Content-transfer-encoding: quoted-printable I=B9m wondering what (in general) causes a join to use temporary tables and filesorts... More specifically, what can I tune to avoid it? I can give more info about a specific situation if anyone=B9s interested. All the docs say is that you are likely to get a =B3Using temporary=B2 if you sort on a different column set than the =B3group by=B2, but I=B9m not doing that...something else must be triggering it.
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PhpMyAdmin Export With Temporary Tables
I have a multi-statement sql script that creates two temporary tables and then runs a query on them. The query runs fine.However, I want to use phpMyAdmin to export the data to .csv format.The export gui only runs the select statement, not the create temporary table statements,so when it tries to select from the temporary tables it does not find them. What do I have to do to get this functionality to work (besides using persistant tables).
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HEAP So Slow
I have a heap database, with 1.5-1.6 milion rows. on that is 2 columns... ID | Title title is indexed. When i run a query like this ------------------ SELECT index_data.* FROM index_data INNER JOIN `index` ON index_data.id=index.id AND index.title LIKE '%$query%' WHERE playtime > $dur... The execution time is about seconds... ------------------ Even a single like statement just on `index` (heap) takes 3-6 seconds. Here's the table stats... ---------------------------- Data 397,442 KB Index 24,639 KB Total 422,081 KB ---------------------------- Why??
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Heap Vs InnoDB Vs MyIsam
I'm trying to improve performance of our website, the boss is complaining that its too slow (though it is faster than a lot of sites). We experience particular slow down during updates - which are done periodically throughout the day. We have nearly 2 million records that are being searched and theres a lot of information there to pull back. Currently all the tables are myIsam, and the total size is around 1.5Gb but the tables being searched probably total 600Mb. We're currently using all 2GB memory at high loads. I tried converting the main search table to InnoDB but that just made everything horrendously slow - I also heard that it limits to 200 inserts per second whereas with myIsam we're getting around 1k - 1.5k per second. Could the slow down be due to not converting the linked tables to innoDB? Or just lack of caching? I now HEAP is supposed to be super fast for selects, how is it for inserts? Do you think 600Mb database would be ok to be loaded into 2Gb memory and still cope with high traffic loads (relatively high - approx 500 simultaneous users) Or should I stick with MyIsam?
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Flush A Heap Table To Disk
For example if I have data that I want to be inserted in to a heap table (for optimisation reasons) but I don't want to risk losing *all* the data if mysql crashes. Is it possible to perform something like a flush so that if mysql does crash some of the data is saved.
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Flush A Heap Table To Disk?
As the subject says, is it possible to flush the contents of a heap table to disk? For example if I have data that I want to be inserted in to a heap table (for optimisation reasons) but I don't want to risk losing *all* the data if mysql crashes. Is it possible to perform something like a flush so that if mysql does crash some of the data is saved.
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ORDER BY W/ HEAP Table Type
I am creating an online application that lists the last 50 users that loaded a page. I used a InnoDB table type for storing most information (which rarely changes), but was thinking of moving the UPDATE and SELECT function that tracks who last clicked something to a HEAP table for speed. I think I would be OK with the UPDATE to a HEAP table, but I have read that ORDER BY cannot be used on HEAP indexes. But, do I have to use an Index? Can I make a SELECT like this on a HEAP table that has only two columns (login and datenow)? $queryonlineusers="SELECT login FROM mmih_users ORDER BY datenow DESC LIMIT 50";
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Using Temporary
This first query is like so... select m.*, mi.age from members m, members_addtl_info mi where m.nick like '%anynickname%' AND m.nick = mi.nick order by nick desc, account_login_last desc limit 0, 21 +-------+--------+---------------+---------+---------+---------+--------+--- ------------------------------+ | table | type | possible_keys | key | key_len | ref | rows | Extra | +-------+--------+---------------+---------+---------+---------+--------+--- ------------------------------+ | mi | ALL | PRIMARY | NULL | NULL | NULL | 740053 | Using temporary; Using filesort | | m | eq_ref | PRIMARY | PRIMARY | 15 | mi.nick | 1 | where used | +-------+--------+---------------+---------+---------+---------+--------+--- ------------------------------+ 2nd query seems alot fasteer..... select m.* from members m where m.nick like '%bigsh523%' order by nick desc, account_login_last desc limit 0, 21 +-------+------+---------------+------+---------+------+--------+----------- -----------------+ | table | type | possible_keys | key | key_len | ref | rows | Extra | +-------+------+---------------+------+---------+------+--------+----------- -----------------+ | m | ALL | NULL | NULL | NULL | NULL | 736939 | where used; Using filesort | +-------+------+---------------+------+---------+------+--------+-----------
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Using Temporary Table
I have added a search function to a mysql database that creates alot of results. My plan was to use a temporary table to store the results and then display (using php and html) them 10 per page. This works great on page one, but then when I move on to the next page I get an error because the temporary table no longer exists. I pagiate by first getting a count of the resultset and then passing on a variable for the limit.
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Create Temporary Table
When I try and run the following query create temporary table russ1 as select rcust.* from rcust; and I receive the error message: Error Code : 1044 Access denied for user: 'russ@192.168.1.79' to database 'customer' (0 ms taken) I can run the query from the command line of the server and the query works correctly. I have run the query GRANT ALL PRIVILEGES ON customer.* TO russ@192.168.1.79 In addition, I flushed the privileges, and I stopped and restarted the database.
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Grant Select Temporary
I'm trying to use a grant command on a redhat 9 v:3.23.56-1.9 :- " grant create temporary tables on iptables.* to iptables_user@localhost identified by 'xxx' " And I get this syntax error, to which I cannot find the answer. ERROR 1064: You have an error in your SQL syntax near 'temporary tables on iptables.* to iptables_user@localhost identified by 'xxx' at line 1
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Temporary Table Is Full
During executing SELECT query, MySQL creates disk temporary table. After the tabe exceeds 4GB I get table is full error. How can I change settings to remove 4 GB bareer from disk tmp tables? It is easy to set in phisical MyISAM table by increase MAX_ROWS.
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Temporary Table Inserts?
I was wondering, we all know that temporary tables are system bottleneck, I was wondering if the slowness of inserts for temporary table is related to the number of fields that the temporary table have? What I mean is, would a temporary table with 2 fields run INSERT statements faster than a temporary table with 5 fields?
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Cannot Create Temporary Table
I cannot create a temporary table. What am I doing wrong? CREATE TEMPORARY TABLE UMB.SRC_TMP Select * from SRC_TMP limit 10; Select count(*) from UMB.SRC_TMP; table 'umb.src_tmp' doesn't exist.
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Temporary Table Error
I was surprised to get this error when playing with temporary tables: mysql> use test; Database changed mysql> create temporary table t (i int); ERROR 1049 (42000): Unknown database 'test' I am using WinXP with MySQL version14.7 Distrib 4.1.21 - mysql-max Does anyone know why I can't create a temp table? This happens with any database I select.
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Errcode 17 In Temporary Directory
I run a web server (on IIS) with a big site on it. It has php5, mysql 5 and odbc 3.51 It has 640MB of ram. at random times I get this error (not always the same file, but similar): [MySQL][ODBC 3.51 Driver][mysqld-5.0.27-community-log]Can't create/write to file 'C:EasyPHP mp#sql_3fc0_0.MYD' (Errcode: 17) If I go to that directory and delete that file, the problem disappears. But until I do this the pages display a mysql/odbc error and nothin works. So if it happens at night or when I'm out, my website will remain down for a lot. Really annoying problem!! I googled the errcode 17 and found out that it can be caused by: - directory permission problem > this is not my case, I've given correct permissions - an antivirus performing a scan in the temp directory > this is not my case So what is this?! Code:
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Temporary Lock Record
I would like to know if i can lock a record while someone access it. Example: Table: myTable Field1 Field2 name1 1 name2 0 name3 0 ... ... can i issue a satement to lock the record with the name2 ? and another statement to unlock it later in my code ? so that while name2 is locked, other people can only access name1, name3,...
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Temporary Table Performance
Since I work with MySQL 4.0... I can't use sub queries. So I have to create a temporary table to perform a complex request. The request has to be called periodically (let's say every second). The data in the temporary table must be refreshed each time I perform the request. My question is : What solution has le lower cost in terms of performance : droping, recreating the table and inserting the new data OR deleting all the records and inserting the new ones? The table contains less than 500 records.
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Error Creating Temporary Table
I want to create a temporary table and I get the following error message : mysql> CREATE TEMPORARY TABLE tempemp AS SELECT * FROM emp; ERROR 1044: Access denied for user: '@localhost' to database 'test1' Code:
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Temporary Table Can Act Like Session Variables
i m looking to use a temporary table that acts more like a SESSION variable does in php. i use other temp tables in the site im working on and they go away after the sql connection is closed at the end of the page. i was wondering if theres a way to create a table that is there for a certain time period, or the best would be, like i said earlier, to act almost exactly like a session variable.
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Error Inserting Into Temporary Table
I create a temporary table by using following statement: CREATE TEMPORARY TABLE ttable1( id tinyint( 4 ) , q decimal( 5, 0 ) ) TYPE = HEAP tryng insert a record by statement: INSERT INTO ttable1 VALUES ('1','1') return the following: #1146 - Table 'rail.ttable1' doesn't exist How can I insert in my temp table?
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Nested Query On A Temporary Table
Yeterday I started playing with temporary tables but ran into a problem. Let me describe the situation: As a programmer of a family tree program I want to know if there are any isolated families in a family tree. The program has a table called families and in this table looks as follows:
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Temporary Table Accessable Only In Instance Of Procedure
If I have a procedure that will be run simultaneously by several people which requires the use of a temporary table is there a way for the table to be accessible only in the instance in which the procedure is being run so that multiple tables can have the same name but not have collisions? I would normally think to name the table with a random string but apparently SQL rules do not allow dynamically generated table names. The other thing I would try is to have a permanent memory table with the structure I need, with an additional column that would be populated with a random number that indicates which batch is being processed, with the contents being deleted right before the procedure ends. I don't know what kind of impact that would have on the server, and am hesitant to try as my test environment has nowhere near the capacity of the production environment, in just about every way possible.
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Temporary Table Are Dropped After Close Connection?
I think I know the answer to this question, but just to make sure. Temporary tables are dropped as soon as the connection is closed. The connection refers to the mysql connection as oppossed to a SESSION? So if I wanted to preserve data for a user within their session, but delete it as soon as their session ends, temporary tables probably would work for me?
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Create Temporary Table With Read Permissions Only
In one database I made a query like this create temporary table tempT type=heap select * from orig_table1; insert into tempT select * from table2; SELECT column1, column2, column3, sum(column4) as sumOfColumn4, etc, WHERE date = 20070306 and name = "jan" GROUP BY Column4 order by name desc; drop table tempT; But on another server I only have read permissions. Is there a trick to do such a thing when you only have read permissions. Can I add the output in a variable and then merge the second select in the variable and if necessary empty the variable?
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Temporary Table Or Append Master Table
I am using PHP to interface to MySQL. After PHP provides the user inputted data, MySQL will perform several queries using both the user data as well as several other non-user specific tables, and return the resultant values which PHP will return to the user. Multiple users will access the system simultaneously. I know of two possible solutions, but don’t know which is better. I can either create a table called T_USER_DATA (there will actually be 6 tables, some with one row per user and others with multiple rows) with a column for C_USER_ID, and additional columns for the user’s data. The user data rows will be added, and then filtered based on the USER_ID. Or, I can create a temporary table (maybe using a memory engine for faster speed?) specific for a given user on the fly when PHP passes the data. The queries are performed, data returned to PHP, and then the temporary table is deleted when the connection to MySQL is closed.
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