mirror of
https://github.com/simtactics/niotso.git
synced 2025-04-03 16:24:04 +00:00
58 lines
2.5 KiB
C
58 lines
2.5 KiB
C
/*-------------------------------------------------------------------------
|
|
*
|
|
* catversion.h
|
|
* "Catalog version number" for PostgreSQL.
|
|
*
|
|
* The catalog version number is used to flag incompatible changes in
|
|
* the PostgreSQL system catalogs. Whenever anyone changes the format of
|
|
* a system catalog relation, or adds, deletes, or modifies standard
|
|
* catalog entries in such a way that an updated backend wouldn't work
|
|
* with an old database (or vice versa), the catalog version number
|
|
* should be changed. The version number stored in pg_control by initdb
|
|
* is checked against the version number compiled into the backend at
|
|
* startup time, so that a backend can refuse to run in an incompatible
|
|
* database.
|
|
*
|
|
* The point of this feature is to provide a finer grain of compatibility
|
|
* checking than is possible from looking at the major version number
|
|
* stored in PG_VERSION. It shouldn't matter to end users, but during
|
|
* development cycles we usually make quite a few incompatible changes
|
|
* to the contents of the system catalogs, and we don't want to bump the
|
|
* major version number for each one. What we can do instead is bump
|
|
* this internal version number. This should save some grief for
|
|
* developers who might otherwise waste time tracking down "bugs" that
|
|
* are really just code-vs-database incompatibilities.
|
|
*
|
|
* The rule for developers is: if you commit a change that requires
|
|
* an initdb, you should update the catalog version number (as well as
|
|
* notifying the pghackers mailing list, which has been the informal
|
|
* practice for a long time).
|
|
*
|
|
* The catalog version number is placed here since modifying files in
|
|
* include/catalog is the most common kind of initdb-forcing change.
|
|
* But it could be used to protect any kind of incompatible change in
|
|
* database contents or layout, such as altering tuple headers.
|
|
*
|
|
*
|
|
* Portions Copyright (c) 1996-2011, PostgreSQL Global Development Group
|
|
* Portions Copyright (c) 1994, Regents of the University of California
|
|
*
|
|
* src/include/catalog/catversion.h
|
|
*
|
|
*-------------------------------------------------------------------------
|
|
*/
|
|
#ifndef CATVERSION_H
|
|
#define CATVERSION_H
|
|
|
|
/*
|
|
* We could use anything we wanted for version numbers, but I recommend
|
|
* following the "YYYYMMDDN" style often used for DNS zone serial numbers.
|
|
* YYYYMMDD are the date of the change, and N is the number of the change
|
|
* on that day. (Hopefully we'll never commit ten independent sets of
|
|
* catalog changes on the same day...)
|
|
*/
|
|
|
|
/* yyyymmddN */
|
|
#define CATALOG_VERSION_NO 201105231
|
|
|
|
#endif
|