data-migration

问题 I need to copy all rows from table1 matching specific columns into table2 with different columns name. For example: table1 name = oldAddressBook , table1's columns name = Name,Surname,Number table2 name = newAddressBook , table2's columns name = newName,newSurname,Phone Data in columns "Name,Surname,Number" in "oldAddressBook" must fill respectively "newName,newSurname,Phone" in "newAddressBook". "oldAddressBook" and "newAddressBook" contain also other columns. 回答1: INSERT INTO newAddressBook

问题 We have a normalized SQL Server 2008 database designed using generic tables. So, instead of having a separate table for each entity (e.g. Products, Orders, OrderItems, etc), we have generic tables (Entities, Instances, Relationships, Attributes, etc). We have decided to have a separate denormalized database for quick retrieval of data. Could you please advise me of various technologies out there to synchronize these 2 databases, assuming they have different schemas? Cheers, Mosh 回答1: When two

问题 DISCLAIMER: This question is similar to the stack overflow question here, but none of those answers work for my problem, as I will explain later. I'm trying to copy a large table (~40M rows, 100+ columns) in postgres where a lot of the columns are indexed. Currently I use this bit of SQL: CREATE TABLE <tablename>_copy (LIKE <tablename> INCLUDING ALL); INSERT INTO <tablename>_copy SELECT * FROM <tablename>; This method has two issues: It adds the indices before data ingest, so it will take

问题 DISCLAIMER: This question is similar to the stack overflow question here, but none of those answers work for my problem, as I will explain later. I'm trying to copy a large table (~40M rows, 100+ columns) in postgres where a lot of the columns are indexed. Currently I use this bit of SQL: CREATE TABLE <tablename>_copy (LIKE <tablename> INCLUDING ALL); INSERT INTO <tablename>_copy SELECT * FROM <tablename>; This method has two issues: It adds the indices before data ingest, so it will take

问题 After making some changes in my models (eg. new field in a model and a new model) what is the best way of reflecting these changes to my populated database? PS: I wanted to see many solutions in one place rated. Apparently more solutions are already listed here. 回答1: I've asked a similar question here and got quite a few answers. There are quite a lot of ways of doing it, like manually doing the dumping and reloading with SQL, using fixtures or using one of the "emerging" schema-evolution

问题 I have one table: drupal.comments , with amongst others, the columns: cid: primary key uid: foreign key to users table, optional name: varchar, optional email: varchar, optional The description says: UID is optional, if 0, comment made by anonymous; in that case the name/email is set. I want to split this out into two tables rails.comments and rails.users , where there is always a user: id: primary key users_id: foreign key, always set. So, for each drupal.comment, I need to create either a

问题 I followed the guide found here: http://www.timisted.net/blog/archive/core-data-migration/ but keep getting "Can't find mapping model for migration" when I start up the app with the new model. I've tried it in xcode 3 and xcode 4, multiple times, but can never get it to work. Currently my options are set to: NSDictionary *options = [NSDictionary dictionaryWithObjectsAndKeys: [NSNumber numberWithBool:YES], NSMigratePersistentStoresAutomaticallyOption, [NSNumber numberWithBool:NO],

问题 I want to do that using a code and not using a tool like "MySQL Migration Toolkit". The easiest way I know is to open a connection (using MySQL connectors) to DB1 and read its data. Open connection to DB2 and write the data to it. Is there a better/easiest way ? 回答1: First I'm going to assume you aren't in a position to just copy the data/ directory, because if you are then using your existing snapshot/backup/restore will probably suffice (and test your backup/restore procedures into the

问题 I am currently using Jenkins on my development PC. I installed it on my development PC, because I had limited knowledge on this tool; so I tested on it in my development PC. Now, I feel comfortable with Jenkins as my long term "partner" in the build process and would like to "move" this Jenkins to a dedicated server. Before this I have done few builds and have the artifacts archived from each build. In particular, the build number is very important to me for version control. How can I export

问题 I use oracle 11, and use exp/imp tools to migrate data between databases. It works very fine IF all empty tables and sequences are already created in target database. But If tables dont exists in target DB than a few bad things happen; It still creates tables but only the ones with data, I couldnt find a way to force it create empty tables in target DB. It does not create the sequences. This is how I enter my values to export tool; Users or Tables -> Tables Export table data -> yes Compress -