The process of replication in PostgreSQL using continuous shipping of WAL xlogs to slave servers and applying them in order to keep them current, is called streaming replication in PostgreSQL. This feature has been there in Posgre since version 9.0
The steps to implement streaming replication is as follows:
PostgreSQL has different options for encryptions at different levels that fulfil your security requirements encompassing different scenarios and insecure networks.
1. Encrypting Columns in PostgreSQL (Encryption For Specific Columns)
The pgcrypto module provides cryptographic functions for PostgreSQL.
You can apply encryption on a specific column. e.g,;
2. If you have the space to do so, copy the whole cluster data directory and any tablespaces to a temporary location in case you need them later. Note that this precaution will require that you have enough free space on your system to hold two copies of your existing database. If you do not have enough space, you should at least save the contents of the cluster's pg_xlog subdirectory, as it might contain logs which were not archived before the system went down.
To set up WAL (Write Ahead Log) we first need to understand the following:
Need: To archive the transaction logs before they are overwritten by Postgre
Mechanism: System physically divides the long sequence of WAL records into small WAL segment files. And now before the file segments are overwritten they are archived (by any OS utility)
We set WAL level to enable WAL archiving to archive_mode or hot_standby. We edit the postgresql.conf:
The process of replication in PostgreSQL using continuous shipping of WAL xlogs to slave servers and applying them in order to keep them current, is called streaming replication in PostgreSQL. This feature has been there in Posgre since version 9.0
The steps to implement streaming replication is as follows:
PostgreSQL has different options for encryptions at different levels that fulfil your security requirements encompassing different scenarios and insecure networks.
1. Encrypting Columns in PostgreSQL (Encryption For Specific Columns)
The pgcrypto module provides cryptographic functions for PostgreSQL.
You can apply encryption on a specific column. e.g,;
2. If you have the space to do so, copy the whole cluster data directory and any tablespaces to a temporary location in case you need them later. Note that this precaution will require that you have enough free space on your system to hold two copies of your existing database. If you do not have enough space, you should at least save the contents of the cluster's pg_xlog subdirectory, as it might contain logs which were not archived before the system went down.
To set up WAL (Write Ahead Log) we first need to understand the following:
Need: To archive the transaction logs before they are overwritten by Postgre
Mechanism: System physically divides the long sequence of WAL records into small WAL segment files. And now before the file segments are overwritten they are archived (by any OS utility)
We set WAL level to enable WAL archiving to archive_mode or hot_standby. We edit the postgresql.conf:
I installed Postgres 9.2 on Linux RHEL 7.3 using PostgreSQL binary. I am unable to connect to the PostgreSQL database. Error:
I installed Postgres 9.2 on Linux RHEL 7.3 using PostgreSQL binary. I am unable to connect to the PostgreSQL database. Error:
$psql postgres
psql: Could not connect to the server: No such file or directory
Is the server running locally and accepting
connectioni on Unix domain socket "/var/run/postgresql/.s.PGSQL.5432"?
