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Major overhaul of large-object implementation, by Denis Perchine with

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kibitzing from Tom Lane.  Large objects are now all stored in a single
system relation "pg_largeobject" --- no more xinv or xinx files, no more
relkind 'l'.  This should offer substantial performance improvement for
large numbers of LOs, since there won't be directory bloat anymore.
It'll also fix problems like running out of locktable space when you
access thousands of LOs in one transaction.
Also clean up cruft in read/write routines.  LOs with "holes" in them
(never-written byte ranges) now work just like Unix files with holes do:
a hole reads as zeroes but doesn't occupy storage space.
INITDB forced!
This commit is contained in:
Tom Lane
2000-10-24 01:38:44 +00:00
parent d7186cfa9b
commit 4f44aa04b5
21 changed files with 735 additions and 1205 deletions
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14
src/bin/pg_dump/pg_dump.c
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@@ -22,7 +22,7 @@
*
*
* IDENTIFICATION
* $Header: /cvsroot/pgsql/src/bin/pg_dump/pg_dump.c,v 1.174 2000/10/22 23:16:55 pjw Exp $
* $Header: /cvsroot/pgsql/src/bin/pg_dump/pg_dump.c,v 1.175 2000/10/24 01:38:32 tgl Exp $
*
* Modifications - 6/10/96 - dave@bensoft.com - version 1.13.dhb
*
@@ -1104,7 +1104,7 @@ dumpBlobs(Archive *AH, char* junkOid, void *junkVal)
fprintf(stderr, "%s saving BLOBs\n", g_comment_start);
/* Cursor to get all BLOB tables */
appendPQExpBuffer(oidQry, "Declare blobOid Cursor for SELECT oid from pg_class where relkind = '%c'", RELKIND_LOBJECT);
appendPQExpBuffer(oidQry, "Declare blobOid Cursor for SELECT DISTINCT loid FROM pg_largeobject");
res = PQexec(g_conn, oidQry->data);
if (!res || PQresultStatus(res) != PGRES_COMMAND_OK)
@@ -1874,8 +1874,7 @@ getTables(int *numTables, FuncInfo *finfo, int numFuncs)
* tables before the child tables when traversing the tblinfo*
*
* we ignore tables that are not type 'r' (ordinary relation) or 'S'
* (sequence) or 'v' (view) --- in particular, Large Object
* relations (type 'l') are ignored.
* (sequence) or 'v' (view).
*/
appendPQExpBuffer(query,
@@ -1886,7 +1885,6 @@ getTables(int *numTables, FuncInfo *finfo, int numFuncs)
"where relname !~ '^pg_' "
"and relkind in ('%c', '%c', '%c') "
"order by oid",
RELKIND_VIEW,
RELKIND_RELATION, RELKIND_SEQUENCE, RELKIND_VIEW);
res = PQexec(g_conn, query->data);
@@ -2585,7 +2583,7 @@ getIndices(int *numIndices)
* find all the user-defined indices. We do not handle partial
* indices.
*
* Notice we skip indices on inversion objects (relkind 'l')
* Notice we skip indices on system classes
*
* this is a 4-way join !!
*/
@@ -2597,8 +2595,8 @@ getIndices(int *numIndices)
"from pg_index i, pg_class t1, pg_class t2, pg_am a "
"WHERE t1.oid = i.indexrelid and t2.oid = i.indrelid "
"and t1.relam = a.oid and i.indexrelid > '%u'::oid "
"and t2.relname !~ '^pg_' and t2.relkind != '%c' and not i.indisprimary",
g_last_builtin_oid, RELKIND_LOBJECT);
"and t2.relname !~ '^pg_' and not i.indisprimary",
g_last_builtin_oid);
res = PQexec(g_conn, query->data);
if (!res ||