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Diffstat (limited to 'databases/postgresql91-upgrade/DESCR')
| -rw-r--r-- | databases/postgresql91-upgrade/DESCR | 14 |
1 files changed, 14 insertions, 0 deletions
diff --git a/databases/postgresql91-upgrade/DESCR b/databases/postgresql91-upgrade/DESCR new file mode 100644 index 00000000000..18267e4ba9a --- /dev/null +++ b/databases/postgresql91-upgrade/DESCR @@ -0,0 +1,14 @@ +pg_upgrade (formerly called pg_migrator) allows data stored +in PostgreSQL data files to be migrated to a later PostgreSQL +major version without the data dump/reload typically required +for major version upgrades, e.g. from 8.4.7 to the current +major release of PostgreSQL. It is not required for minor +version upgrades, e.g. from 9.0.1 to 9.0.4. + +pg_upgrade works because, though new features are regularly +added to PostgreSQL major releases, the internal data storage +format rarely changes. pg_upgrade does its best to make sure the +old and new clusters are binary-compatible, e.g. by checking for +compatible compile-time settings, including 32/64-bit binaries. +It is important that any external modules are also binary +compatible, though this cannot be checked by pg_upgrade. |