1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
|
/*-------------------------------------------------------------------------
*
* vacuumlo.c
* This removes orphaned large objects from a database.
*
* Portions Copyright (c) 1996-2000, PostgreSQL, Inc
* Portions Copyright (c) 1994, Regents of the University of California
*
*
* IDENTIFICATION
* $Header: /cvsroot/pgsql/contrib/vacuumlo/vacuumlo.c,v 1.5 2000/06/19 13:54:50 momjian Exp $
*
*-------------------------------------------------------------------------
*/
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <sys/types.h>
#include <sys/stat.h>
#include <fcntl.h>
#include <unistd.h>
#include "libpq-fe.h"
#include "libpq/libpq-fs.h"
#define BUFSIZE 1024
int vacuumlo(char *, int);
/*
* This vacuums a database. It returns 1 on success, -1 on failure.
*/
int
vacuumlo(char *database, int verbose)
{
PGconn *conn;
PGresult *res,
*res2;
char buf[BUFSIZE];
int matched = 0; /* Number matched per scan */
int i;
conn = PQsetdb(NULL, NULL, NULL, NULL, database);
/* check to see that the backend connection was successfully made */
if (PQstatus(conn) == CONNECTION_BAD)
{
fprintf(stderr, "Connection to database '%s' failed.\n", database);
fprintf(stderr, "%s", PQerrorMessage(conn));
return -1;
}
if (verbose)
fprintf(stdout, "Connected to %s\n", database);
/*
* First we create and populate the lo temp table
*/
buf[0] = '\0';
strcat(buf, "SELECT oid AS lo ");
strcat(buf, "INTO TEMP TABLE vacuum_l ");
strcat(buf, "FROM pg_class ");
strcat(buf, "WHERE relkind='l'");
if (!(res = PQexec(conn, buf)))
{
fprintf(stderr, "Failed to create temp table.\n");
PQfinish(conn);
return -1;
}
PQclear(res);
/*
* Now find any candidate tables who have columns of type oid (the
* column oid is ignored, as it has attnum < 1)
*/
buf[0] = '\0';
strcat(buf, "SELECT c.relname, a.attname ");
strcat(buf, "FROM pg_class c, pg_attribute a, pg_type t ");
strcat(buf, "WHERE a.attnum > 0 ");
strcat(buf, " AND a.attrelid = c.oid ");
strcat(buf, " AND a.atttypid = t.oid ");
strcat(buf, " AND t.typname = 'oid' ");
strcat(buf, " AND c.relname NOT LIKE 'pg_%'");
if (!(res = PQexec(conn, buf)))
{
fprintf(stderr, "Failed to create temp table.\n");
PQfinish(conn);
return -1;
}
for (i = 0; i < PQntuples(res); i++)
{
char *table,
*field;
table = PQgetvalue(res, i, 0);
field = PQgetvalue(res, i, 1);
if (verbose)
{
fprintf(stdout, "Checking %s in %s: ", field, table);
fflush(stdout);
}
res2 = PQexec(conn, "begin");
PQclear(res2);
buf[0] = '\0';
strcat(buf, "DELETE FROM vacuum_l ");
strcat(buf, "WHERE lo IN (");
strcat(buf, "SELECT ");
strcat(buf, field);
strcat(buf, " FROM ");
strcat(buf, table);
strcat(buf, ");");
if (!(res2 = PQexec(conn, buf)))
{
fprintf(stderr, "Failed to check %s in table %s\n", field, table);
PQclear(res);
PQfinish(conn);
return -1;
}
if (PQresultStatus(res2) != PGRES_COMMAND_OK)
{
fprintf(stderr,
"Failed to check %s in table %s\n%s\n",
field, table,
PQerrorMessage(conn)
);
PQclear(res2);
PQclear(res);
PQfinish(conn);
return -1;
}
PQclear(res2);
res2 = PQexec(conn, "end");
PQclear(res2);
}
PQclear(res);
/* Start the transaction */
res = PQexec(conn, "begin");
PQclear(res);
/*
* Finally, those entries remaining in vacuum_l are orphans.
*/
buf[0] = '\0';
strcat(buf, "SELECT lo ");
strcat(buf, "FROM vacuum_l");
if (!(res = PQexec(conn, buf)))
{
fprintf(stderr, "Failed to read temp table.\n");
PQfinish(conn);
return -1;
}
matched = PQntuples(res);
for (i = 0; i < matched; i++)
{
Oid lo = (Oid) atoi(PQgetvalue(res, i, 0));
if (verbose)
{
fprintf(stdout, "\rRemoving lo %6d \n", lo);
fflush(stdout);
}
if (lo_unlink(conn, lo) < 0)
fprintf(stderr, "Failed to remove lo %d\n", lo);
}
PQclear(res);
/*
* That's all folks!
*/
res = PQexec(conn, "end");
PQclear(res);
PQfinish(conn);
if (verbose)
fprintf(stdout, "\rRemoved %d large objects from %s.\n", matched, database);
return 0;
}
int
main(int argc, char **argv)
{
int verbose = 0;
int arg;
int rc = 0;
if (argc < 2)
{
fprintf(stderr, "Usage: %s [-v] database_name [db2 ... dbn]\n",
argv[0]);
exit(1);
}
for (arg = 1; arg < argc; arg++)
{
if (strcmp("-v", argv[arg]) == 0)
verbose = !verbose;
else
rc += vacuumlo(argv[arg], verbose);
}
return rc;
}
|
