Author Archives: George Valentin Voina

EdgeRouter: Dual WAN + Hair Pin+ Multiple networks + OpenVPN site-to-site VPN

By | April 1, 2016
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My setup becomes more and more complicated bellow there are the updated steps of my configurations with references to the original posts containing the partial configurations. STEP 1 EdgeRouter : Dual WAN with Hair Pin Initially I started with a dual-wan configuration with some extra setting to exclude from load balancing the hair pin connections:… Read More: EdgeRouter: Dual WAN + Hair Pin+ Multiple networks + OpenVPN… »

EdgeRouter: Dynamic DNS with afraid.org

By | July 11, 2016
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I wanted to use for my site-to-site VPN connection some aliases in the configuration files. The simple solution was to configure some dynamic DNS aliases with afraid.org After creating an account and defining a site name like site1.mooo.com do the following from CLI configure set service dns dynamic interface eth0 service afraid host-name site1.mooo.com set… Read More: EdgeRouter: Dynamic DNS with afraid.org »

DB2: Find a foreign key

By | February 8, 2017
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Sometimes working with Hibernate you get the following error in case a persist is executed on an object with dependencies. com.ibm.db2.jcc.am.SqlIntegrityConstraintViolationException: Error for batch element #1: The insert or update value of the FOREIGN KEY “INST1.MESSAGE.FK_1FUTL48XT47HPPGH0YXQM1MIJ” is not equal to any value of the parent key of the parent table.. SQLCODE=-530, SQLSTATE=23503, DRIVER=4.13.127 From IBM… Read More: DB2: Find a foreign key »

Oracle: Finding and adding indices

By | February 8, 2017
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Sometimes things go slow in the database even if the original setup was done with a lot of care. The data traffic the usage of the application can sometimes impose the need of extra indices in addition to the original indices added by the enterprise application client that uses the Oracle database. The following procedure… Read More: Oracle: Finding and adding indices »

Microsoft SQL Server: Database Replication (Mirroring)

By | October 25, 2017
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Microsoft SQL Server Standard Edition has a great feature present in this basic license: Database Replication in Synchronous mode. To activate the database replication of a database from Primary Site (PR) to Disaster Recovery Site (DR) where the database to be replicated is called myDB the following simple steps must be performed: On PR site… Read More: Microsoft SQL Server: Database Replication (Mirroring) »

Microsoft SQL Server: Snapshot isolation

By | February 9, 2017
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Snapshot isolation is a guarantee that all reads made in a transaction will see a consistent snapshot of the database. The transaction itself will successfully commit only if no updates it has made, conflicts with any concurrent updates made since that snapshot. By using it, deadlock situations when a read operation (intense resource consuming operation)… Read More: Microsoft SQL Server: Snapshot isolation »

EdgeRouter POE: Power 48V POE switches

By | May 25, 2016
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I got my EdgeRouter POE from UbiQuiti EdgeRouter, 5-port Router POE and came with the 24VAC power supply. Because the Ubiquity devices are all using the strange low power POE for which 24VAC is enough they ship the EdgeRouter POE with the 24VAC power supply. As a result the device is useless in powering “normal”… Read More: EdgeRouter POE: Power 48V POE switches »