Archive for February 2007
We were told that we are not supposed to look at the actual available free memory for the system, but the actual memory footprint of the program. It was obvious that SortTreeTest was dumping mem to the disk, thus a rising page file. We are going to just accept the data structure we have right now and plow ahead despite its predicted shortcomings. Adding privacy items is a large priority at the moment as well as the database connection.
As for the security errors we are getting when trying to run the project off the main Windows 2003 server, we need to CC our kind messages directed to OSU Engineering Support to our mentor as well.
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| Handy MySQL Commands | ||
| Description | Command | |
| To login (from unix shell) use -h only if needed. | [mysql dir]/bin/mysql -h hostname -u root -p | |
| Create a database on the sql server. | create database [databasename]; | |
| List all databases on the sql server. | show databases; | |
| Switch to a database. | use [db name]; | |
| To see all the tables in the db. | show tables; | |
| To see database’s field formats. | describe [table name]; | |
| To delete a db. | drop database [database name]; | |
| To delete a table. | drop table [table name]; | |
| Show all data in a table. | SELECT * FROM [table name]; | |
| Returns the columns and column information pertaining to the designated table. | show columns from [table name]; | |
| Show certain selected rows with the value “whatever”. | SELECT * FROM [table name] WHERE [field name] = “whatever”; | |
| Show all records containing the name “Bob” AND the phone number ‘3444444′. | SELECT * FROM [table name] WHERE name = “Bob” AND phone_number = ‘3444444′; | |
| Show all records not containing the name “Bob” AND the phone number ‘3444444′ order by the phone_number field. | SELECT * FROM [table name] WHERE name != “Bob” AND phone_number = ‘3444444′ order by phone_number; | |
| Show all records starting with the letters ‘bob’ AND the phone number ‘3444444′. | SELECT * FROM [table name] WHERE name like “Bob%” AND phone_number = ‘3444444′; | |
| Use a regular expression to find records. Use “REGEXP BINARY” to force case-sensitivity. This finds any record beginning with a. | SELECT * FROM [table name] WHERE rec RLIKE “^a$”; | |
| Show unique records. | SELECT DISTINCT [column name] FROM [table name]; | |
| Show selected records sorted in an ascending (asc) or descending (desc). | SELECT [col1],[col2] FROM [table name] ORDER BY [col2] DESC; | |
| Return number of rows. | SELECT COUNT(*) FROM [table name]; | |
| Sum column. | SELECT SUM(*) FROM [table name]; | |
| Join tables on common columns. | select lookup.illustrationid, lookup.personid,person.birthday from lookup left join person on lookup.personid=person.personid=statement to join birthday in person table with primary illustration id; |
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| Switch to the mysql db. Create a new user. | INSERT INTO [table name] (Host,User,Password) VALUES(’%',’user’,PASSWORD(’password’)); | |
| Change a users password.(from unix shell). | [mysql dir]/bin/mysqladmin -u root -h hostname.blah.org -p password ‘new-password’ | |
| Change a users password.(from MySQL prompt). | SET PASSWORD FOR ‘user’@'hostname’ = PASSWORD(’passwordhere’); | |
| Switch to mysql db.Give user privilages for a db. | INSERT INTO [table name] (Host,Db,User,Select_priv,Insert_priv,Update_priv,Delete_priv,Create_priv,Drop_priv) VALUES (’%',’db’,'user’,'Y’,'Y’,'Y’,'Y’,'Y’,'N’); | |
| To update info already in a table. | UPDATE [table name] SET Select_priv = ‘Y’,Insert_priv = ‘Y’,Update_priv = ‘Y’ where [field name] = ‘user’; | |
| Delete a row(s) from a table. | DELETE from [table name] where [field name] = ‘whatever’; | |
| Update database permissions/privilages. | FLUSH PRIVILEGES; | |
| Delete a column. | alter table [table name] drop column [column name]; | |
| Add a new column to db. | alter table [table name] add column [new column name] varchar (20); | |
| Change column name. | alter table [table name] change [old column name] [new column name] varchar (50); | |
| Make a unique column so you get no dupes. | alter table [table name] add unique ([column name]); | |
| Make a column bigger. | alter table [table name] modify [column name] VARCHAR(3); | |
| Delete unique from table. | alter table [table name] drop index [colmn name]; | |
| Load a CSV file into a table. | LOAD DATA INFILE ‘/tmp/filename.csv’ replace INTO TABLE [table name] FIELDS TERMINATED BY ‘,’ LINES TERMINATED BY ‘\n’ (field1,field2,field3); | |
| Dump all databases for backup. Backup file is sql commands to recreate all db’s. | [mysql dir]/bin/mysqldump -u root -ppassword –opt >/tmp/alldatabases.sql | |
| Dump one database for backup. | [mysql dir]/bin/mysqldump -u username -ppassword –databases databasename >/tmp/databasename.sql | |
| Dump a table from a database. | [mysql dir]/bin/mysqldump -c -u username -ppassword databasename tablename > /tmp/databasename.tablename.sql | |
| Restore database (or database table) from backup. | [mysql dir]/bin/mysql -u username -ppassword databasename < /tmp/databasename.sql | |
| Create Table Example 1. | CREATE TABLE [table name] (firstname VARCHAR(20), middleinitial VARCHAR(3), lastname VARCHAR(35),suffix VARCHAR(3), officeid VARCHAR(10),userid VARCHAR(15),username VARCHAR(8),email VARCHAR(35),phone VARCHAR(25), groups VARCHAR(15),datestamp DATE,timestamp time,pgpemail VARCHAR(255)); |
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| Create Table Example 2. | create table [table name] (personid int(50) not null auto_increment primary key,firstname varchar(35),middlename varchar(50),lastname varchar(50) default ‘bato’); | |
http://www.pantz.org/database/mysql/mysqlcommands.shtml
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We ran the SortTree test starting at 4:24 pm. Logging of time, number of items added, cpu usage, ram usage were automatically written to a text file. Mem usage steadily dropped until it reached a low point. Unexpectedly, it started increasing once it reached the lowest level. It kept repeating this and never actually crashed.
Start 4:24 p.m.
End 8:51 p.m. 1,240,500,463 items added to the tree. At this point it was reaching 0 memory much more often, but it still kept running.
The page file increased throughout the test. At the end it was about 1.18 gb. Wasn’t it around 400mb at the beginning?
Supposedly over a billion items were added to the tree in 4 hours.
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