Abbreviation for "storage manager" in the source code

smgr is a commonly used abbreviation for "storage manager" in the source code.

Source code

See: src/include/storage/smgr.h

 * smgr.c maintains a table of SMgrRelation objects, which are essentially
 * cached file handles.  An SMgrRelation is created (if not already present)
 * by smgropen(), and destroyed by smgrclose().  Note that neither of these
 * operations imply I/O, they just create or destroy a hashtable entry.
 * (But smgrclose() may release associated resources, such as OS-level file
 * descriptors.)


PostgreSQL internals