13 Oracle GoldenGate Automatic Conflict Detection and Resolution About Oracle GoldenGate Oracle GoldenGate is a heterogeneous replication system with integrated support for replication between Oracle and other databases.
(Otherwise you risk getting all the text until the end of the line as a parameter value.) The DSL expressions are tried, one after the other, according to their order in the DSL definition file. After any match, all remaining DSL expressions are investigated, too. The resulting DRL text may consist of more than one line.
PostgreSQL uses Multi-Version Concurrency Control (MVCC) to maintain multiple versions of a row when performing data modifications. During UPDATE and DELETE operations on a table, the database keeps the old versions of the rows for other running transactions that may need a consistent view of the data.
merge — insert(..).onConflict(..).merge() / insert(..).onConflict(..).merge(updates) Implemented for the PostgreSQL, MySQL, and SQLite databases. Modifies an insert query, to turn it into an 'upsert' operation. Uses ON DUPLICATE KEY UPDATE in MySQL, and adds an ON CONFLICT (columns) DO UPDATE clause to the insert statement in PostgreSQL and ...
Feb 18, 2008 · The INFORMATION_SCHEMA views provide meta data information about the tables, columns, and other parts of your database. Because the structure of these tables are standardized you can write SQL statements that work on various database platforms. For example suppose you want to return a resultset with a list of all columns in a table called employees
Jun 25, 2018 · PostgreSQL system columns xmin and xmax allow visibility tracking of the rows so that concurrent statement have a consistent snapshot of the server’s data set at all times. As row locking is done per-tuple in PostgreSQL, an update statement only ever blocks another update , delete or select for update statement that targets the same row(s).
If the data exists, we update the required columns, if not, we insert a new record. In PostgreSQL it is called UPSERT. In the following example we insert a new record or update the email address if the name columns match.