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pgstat.c
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/*
* pgstat, a PostgreSQL app to gather statistical informations
* from a PostgreSQL database, and act like a vmstat tool.
*
* This software is released under the PostgreSQL Licence.
*
* Guillaume Lelarge, [email protected], 2014-2023.
*
* pgstats/pgstat.c
*/
/*
* Headers
*/
#include "postgres_fe.h"
#include "common/string.h"
#include <err.h>
#include <sys/ioctl.h>
#include <sys/signal.h>
#include <sys/stat.h>
#include <unistd.h>
#ifdef HAVE_GETOPT_H
#include <getopt.h>
#endif
#include "postgres_fe.h"
#include "common/username.h"
#include "common/logging.h"
#include "fe_utils/cancel.h"
#include "fe_utils/connect_utils.h"
#include "fe_utils/option_utils.h"
#include "fe_utils/query_utils.h"
#include "fe_utils/simple_list.h"
#include "fe_utils/string_utils.h"
#include "libpq-fe.h"
#include "libpq/pqsignal.h"
/*
* Defines
*/
#define PGSTAT_VERSION "1.2.0"
#define PGSTAT_DEFAULT_LINES 20
#define PGSTAT_DEFAULT_STRING_SIZE 1024
#define PGSTAT_OLDEST_STAT_RESET "0001-01-01"
/*
* Structs and enums
*/
typedef enum
{
NONE = 0,
ARCHIVER,
BGWRITER,
BUFFERCACHE,
CONNECTION,
DATABASE,
TABLE,
TABLEIO,
INDEX,
FUNCTION,
STATEMENT,
SLRU,
XLOG,
TEMPFILE,
REPSLOTS,
WAITEVENT,
WAL,
PROGRESS_ANALYZE,
PROGRESS_BASEBACKUP,
PROGRESS_CLUSTER,
PROGRESS_COPY,
PROGRESS_CREATEINDEX,
PROGRESS_VACUUM,
PBPOOLS,
PBSTATS
} stat_t;
/* these are the options structure for command line parameters */
struct options
{
/* misc */
bool verbose;
bool dontredisplayheader;
stat_t stat;
char *filter;
bool human_readable;
/* connection parameters */
char *dbname;
char *hostname;
char *port;
char *username;
/* version number */
int major;
int minor;
/* extension namespace (pg_stat_statements or pg_buffercache) */
char *namespace;
/* frequency */
int interval;
int count;
};
/* pg_stat_archiver struct */
struct pgstatarchiver
{
long archived_count;
/*
we don't put these columns here because it makes no sense to get a diff between the new and the old values
? last_archived_wal;
? last_archived_time;
*/
long failed_count;
/*
we don't put these columns here because it makes no sense to get a diff between the new and the old values
? last_failed_wal;
? last_failed_time;
*/
char *stats_reset;
};
/* pg_stat_bgwriter struct */
struct pgstatbgwriter
{
long checkpoints_timed;
long checkpoints_req;
long checkpoint_write_time;
long checkpoint_sync_time;
long buffers_checkpoint;
long buffers_clean;
long maxwritten_clean;
long buffers_backend;
long buffers_backend_fsync;
long buffers_alloc;
char *stats_reset;
};
/* pg_stat_database struct */
struct pgstatdatabase
{
/*
we don't put numbackends here because it makes no sense to get a diff between the new and the old values
long numbackends;
*/
long xact_commit;
long xact_rollback;
long blks_read;
long blks_hit;
long tup_returned;
long tup_fetched;
long tup_inserted;
long tup_updated;
long tup_deleted;
long conflicts;
long temp_files;
long temp_bytes;
long deadlocks;
long checksum_failures;
/* checksum_last_failure */
float blk_read_time;
float blk_write_time;
float session_time;
float active_time;
float idle_in_transaction_time;
long sessions;
long sessions_abandoned;
long sessions_fatal;
long sessions_killed;
char *stats_reset;
};
/* pg_stat_all_tables struct */
struct pgstattable
{
long seq_scan;
long seq_tup_read;
long idx_scan;
long idx_tup_fetch;
long n_tup_ins;
long n_tup_upd;
long n_tup_del;
long n_tup_hot_upd;
long n_live_tup;
long n_dead_tup;
long n_mod_since_analyze;
long n_ins_since_vacuum;
/*
we don't put the timestamps here because it makes no sense to get a diff between the new and the old values
? last_vacuum;
? last_autovacuum;
? last_analyze;
? last_autoanalyze;
*/
long vacuum_count;
long autovacuum_count;
long analyze_count;
long autoanalyze_count;
};
/* pg_statio_all_tables struct */
struct pgstattableio
{
long heap_blks_read;
long heap_blks_hit;
long idx_blks_read;
long idx_blks_hit;
long toast_blks_read;
long toast_blks_hit;
long tidx_blks_read;
long tidx_blks_hit;
};
/* pg_stat_all_indexes struct */
struct pgstatindex
{
long idx_scan;
long idx_tup_read;
long idx_tup_fetch;
};
/* pg_stat_user_functions struct */
struct pgstatfunction
{
long calls;
float total_time;
float self_time;
};
/* pg_stat_statements struct */
struct pgstatstatement
{
/*
long userid;
long dbid;
long queryid;
text query;
*/
long plans;
float total_plan_time;
/*
float min_plan_time;
float max_plan_time;
float mean_plan_time;
float stddev_plan_time;
*/
long calls;
float total_exec_time;
/*
float min_exec_time;
float max_exec_time;
float mean_exec_time;
float stddev_exec_time;
*/
long rows;
long shared_blks_hit;
long shared_blks_read;
long shared_blks_dirtied;
long shared_blks_written;
long local_blks_hit;
long local_blks_read;
long local_blks_dirtied;
long local_blks_written;
long temp_blks_read;
long temp_blks_written;
float blk_read_time;
float blk_write_time;
long wal_records;
long wal_fpi;
long wal_bytes;
};
/* pg_stat_slru struct */
struct pgstatslru
{
long blks_zeroed;
long blks_hit;
long blks_read;
long blks_written;
long blks_exists;
long flushes;
long truncates;
char *stats_reset;
};
/* pg_stat_wal struct */
struct pgstatwal
{
long wal_records;
long wal_fpi;
long wal_bytes;
long wal_buffers_full;
long wal_write;
long wal_sync;
float wal_write_time;
float wal_sync_time;
char *stats_reset;
};
/* repslots struct */
struct repslots
{
char *currentlocation;
char *restartlsn;
long restartlsndiff;
};
/* xlogstats struct */
struct xlogstats
{
char *location;
long locationdiff;
};
/* pgBouncer stats struct */
struct pgbouncerstats
{
long total_request;
long total_received;
long total_sent;
long total_query_time;
/* not used yet
float avg_req;
float avg_recv;
float avg_sent;
float avg_query;
*/
};
/*
* Global variables
*/
PGconn *conn;
struct options *opts;
extern char *optarg;
struct pgstatarchiver *previous_pgstatarchiver;
struct pgstatbgwriter *previous_pgstatbgwriter;
struct pgstatdatabase *previous_pgstatdatabase;
struct pgstattable *previous_pgstattable;
struct pgstattableio *previous_pgstattableio;
struct pgstatindex *previous_pgstatindex;
struct pgstatfunction *previous_pgstatfunction;
struct pgstatstatement *previous_pgstatstatement;
struct pgstatslru *previous_pgstatslru;
struct pgstatwal *previous_pgstatwal;
struct xlogstats *previous_xlogstats;
struct repslots *previous_repslots;
struct pgbouncerstats *previous_pgbouncerstats;
int hdrcnt = 0;
volatile sig_atomic_t wresized;
static int winlines = PGSTAT_DEFAULT_LINES;
/*
* Function prototypes
*/
static void help(const char *progname);
void get_opts(int, char **);
#ifndef FE_MEMUTILS_H
void *pg_malloc(size_t size);
char *pg_strdup(const char *in);
#endif
void print_pgstatarchiver(void);
void print_pgstatbgwriter(void);
void print_pgstatconnection(void);
void print_pgstatdatabase(void);
void print_pgstattable(void);
void print_pgstattableio(void);
void print_pgstatindex(void);
void print_pgstatfunction(void);
void print_pgstatstatement(void);
void print_pgstatslru(void);
void print_pgstatwal(void);
void print_pgstatprogressanalyze(void);
void print_pgstatprogressbasebackup(void);
void print_pgstatprogresscluster(void);
void print_pgstatprogresscopy(void);
void print_pgstatprogresscreateindex(void);
void print_pgstatprogressvacuum(void);
void print_buffercache(void);
void print_xlogstats(void);
void print_repslotsstats(void);
void print_tempfilestats(void);
void print_pgstatwaitevent(void);
void print_pgbouncerpools(void);
void print_pgbouncerstats(void);
void fetch_version(void);
char *fetch_setting(char *name);
void fetch_pgbuffercache_namespace(void);
void fetch_pgstatstatements_namespace(void);
bool backend_minimum_version(int major, int minor);
void print_header(void);
void print_line(void);
void allocate_struct(void);
static void needhdr(int dummy);
static void needresize(int);
void doresize(void);
static void quit_properly(SIGNAL_ARGS);
/*
* Print help message
*/
static void
help(const char *progname)
{
printf("%s gathers statistics from a PostgreSQL database.\n\n"
"Usage:\n"
" %s [OPTIONS] [delay [count]]\n"
"\nGeneral options:\n"
" -f FILTER include only this object\n"
" (only works for database, table, tableio,\n"
" index, function, statement statistics,\n"
" replication slots, and slru)\n"
" -H display human-readable values\n"
" -n do not redisplay header\n"
" -s STAT stats to collect\n"
" -v verbose\n"
" -?|--help show this help, then exit\n"
" -V|--version output version information, then exit\n"
"\nConnection options:\n"
" -h HOSTNAME database server host or socket directory\n"
" -p PORT database server port number\n"
" -U USER connect as specified database user\n"
" -d DBNAME database to connect to\n"
"\nThe default stat is pg_stat_bgwriter, but you can change it with\n"
"the -s command line option, and one of its value (STAT):\n"
" * archiver for pg_stat_archiver (only for 9.4+)\n"
" * bgwriter for pg_stat_bgwriter\n"
" * buffercache for pg_buffercache (needs the extension)\n"
" * connection (only for 9.2+)\n"
" * database for pg_stat_database\n"
" * table for pg_stat_all_tables\n"
" * tableio for pg_statio_all_tables\n"
" * index for pg_stat_all_indexes\n"
" * function for pg_stat_user_function\n"
" * statement for pg_stat_statements (needs the extension)\n"
" * slru for pg_stat_slru (only for 13+)\n"
" * xlog for xlog writes (only for 9.2+)\n"
" * repslots for replication slots\n"
" * tempfile for temporary file usage\n"
" * waitevent for wait events usage\n"
" * wal for pg_stat_wal (only for 14+)\n"
" * progress_analyze for analyze progress monitoring (only for\n"
" 13+)\n"
" * progress_basebackup for base backup progress monitoring (only\n"
" for 13+)\n"
" * progress_cluster for cluster progress monitoring (only for\n"
" 12+)\n"
" * progress_copy for copy progress monitoring (only for\n"
" 14+)\n"
" * progress_createindex for create index progress monitoring (only\n"
" for 12+)\n"
" * progress_vacuum for vacuum progress monitoring (only for\n"
" 9.6+)\n"
" * pbpools for pgBouncer pools statistics\n"
" * pbstats for pgBouncer statistics\n\n"
"Report bugs to <[email protected]>.\n",
progname, progname);
}
/*
* Parse command line options and check for some usage errors
*/
void
get_opts(int argc, char **argv)
{
int c;
const char *progname;
progname = get_progname(argv[0]);
/* set the defaults */
opts->verbose = false;
opts->dontredisplayheader = false;
opts->stat = NONE;
opts->filter = NULL;
opts->human_readable = false;
opts->dbname = NULL;
opts->hostname = NULL;
opts->port = NULL;
opts->username = NULL;
opts->namespace = NULL;
opts->interval = 1;
opts->count = -1;
if (argc > 1)
{
if (strcmp(argv[1], "--help") == 0 || strcmp(argv[1], "-?") == 0)
{
help(progname);
exit(0);
}
if (strcmp(argv[1], "--version") == 0 || strcmp(argv[1], "-V") == 0)
{
puts("pgstats " PGSTAT_VERSION " (compiled with PostgreSQL " PG_VERSION ")");
exit(0);
}
}
/* get opts */
while ((c = getopt(argc, argv, "h:Hp:U:d:f:ns:v")) != -1)
{
switch (c)
{
/* specify the database */
case 'd':
opts->dbname = pg_strdup(optarg);
break;
/* specify the filter */
case 'f':
opts->filter = pg_strdup(optarg);
break;
/* do not redisplay the header */
case 'n':
opts->dontredisplayheader = true;
break;
/* don't show headers */
case 'v':
opts->verbose = true;
break;
/* specify the stat */
case 's':
if (opts->stat != NONE)
{
pg_log_error("You can only use once the -s command line switch.\n");
exit(EXIT_FAILURE);
}
if (!strcmp(optarg, "archiver"))
{
opts->stat = ARCHIVER;
}
else if (!strcmp(optarg, "bgwriter"))
{
opts->stat = BGWRITER;
}
else if (!strcmp(optarg, "buffercache"))
{
opts->stat = BUFFERCACHE;
}
else if (!strcmp(optarg, "connection"))
{
opts->stat = CONNECTION;
}
else if (!strcmp(optarg, "database"))
{
opts->stat = DATABASE;
}
else if (!strcmp(optarg, "table"))
{
opts->stat = TABLE;
}
else if (!strcmp(optarg, "tableio"))
{
opts->stat = TABLEIO;
}
else if (!strcmp(optarg, "index"))
{
opts->stat = INDEX;
}
else if (!strcmp(optarg, "function"))
{
opts->stat = FUNCTION;
}
else if (!strcmp(optarg, "statement"))
{
opts->stat = STATEMENT;
}
else if (!strcmp(optarg, "slru"))
{
opts->stat = SLRU;
}
else if (!strcmp(optarg, "wal"))
{
opts->stat = WAL;
}
else if (!strcmp(optarg, "xlog"))
{
opts->stat = XLOG;
}
else if (!strcmp(optarg, "repslots"))
{
opts->stat = REPSLOTS;
}
else if (!strcmp(optarg, "tempfile"))
{
opts->stat = TEMPFILE;
}
else if (!strcmp(optarg, "waitevent"))
{
opts->stat = WAITEVENT;
}
else if (!strcmp(optarg, "progress_analyze"))
{
opts->stat = PROGRESS_ANALYZE;
}
else if (!strcmp(optarg, "progress_basebackup"))
{
opts->stat = PROGRESS_BASEBACKUP;
}
else if (!strcmp(optarg, "progress_cluster"))
{
opts->stat = PROGRESS_CLUSTER;
}
else if (!strcmp(optarg, "progress_copy"))
{
opts->stat = PROGRESS_COPY;
}
else if (!strcmp(optarg, "progress_createindex"))
{
opts->stat = PROGRESS_CREATEINDEX;
}
else if (!strcmp(optarg, "progress_vacuum"))
{
opts->stat = PROGRESS_VACUUM;
}
else if (!strcmp(optarg, "pbpools"))
{
opts->stat = PBPOOLS;
}
else if (!strcmp(optarg, "pbstats"))
{
opts->stat = PBSTATS;
}
else
{
pg_log_error("Unknown service \"%s\".\n", optarg);
pg_log_info("Try \"%s --help\" for more information.\n", progname);
exit(EXIT_FAILURE);
}
break;
/* host to connect to */
case 'h':
opts->hostname = pg_strdup(optarg);
break;
/* display human-readable values */
case 'H':
opts->human_readable = true;
break;
/* port to connect to on remote host */
case 'p':
opts->port = pg_strdup(optarg);
break;
/* username */
case 'U':
opts->username = pg_strdup(optarg);
break;
default:
pg_log_error("Try \"%s --help\" for more information.\n", progname);
exit(EXIT_FAILURE);
}
}
if (optind < argc)
{
opts->interval = atoi(argv[optind]);
if (opts->interval == 0)
{
pg_log_error("Invalid delay.\n");
pg_log_info("Try \"%s --help\" for more information.\n", progname);
exit(EXIT_FAILURE);
}
optind++;
}
if (optind < argc)
{
opts->count = atoi(argv[optind]);
if (opts -> count == 0)
{
pg_log_error("Invalid count.\n");
pg_log_info("Try \"%s --help\" for more information.\n", progname);
exit(EXIT_FAILURE);
}
}
if (opts->stat == PBPOOLS || opts->stat == PBSTATS)
{
/*
* Set (or override) database name.
* It should always be pgbouncer
*/
opts->dbname = pg_strdup("pgbouncer");
}
if (opts->dbname == NULL)
{
/*
* We want to use dbname for possible error reports later,
* and in case someone has set and is using PGDATABASE
* in its environment preserve that name for later usage
*/
if (!getenv("PGDATABASE"))
opts->dbname = "postgres";
else
opts->dbname = getenv("PGDATABASE");
}
}
#ifndef FE_MEMUTILS_H
/*
* "Safe" wrapper around malloc().
*/
void *
pg_malloc(size_t size)
{
void *tmp;
/* Avoid unportable behavior of malloc(0) */
if (size == 0)
size = 1;
tmp = malloc(size);
if (!tmp)
{
pg_log_error("out of memory (pg_malloc)\n");
exit(EXIT_FAILURE);
}
return tmp;
}
/*
* "Safe" wrapper around strdup().
*/
char *
pg_strdup(const char *in)
{
char *tmp;
if (!in)
{
pg_log_error("cannot duplicate null pointer (internal error)\n");
exit(EXIT_FAILURE);
}
tmp = strdup(in);
if (!tmp)
{
pg_log_error("out of memory (pg_strdup)\n");
exit(EXIT_FAILURE);
}
return tmp;
}
#endif
/*
* Dump all archiver stats.
*/
void
print_pgstatarchiver()
{
char sql[PGSTAT_DEFAULT_STRING_SIZE];
PGresult *res;
int nrows;
int row, column;
long archived_count;
long failed_count;
char *stats_reset;
bool has_been_reset;
/* grab the stats (this is the only stats on one line) */
snprintf(sql, sizeof(sql),
"SELECT archived_count, failed_count, stats_reset, stats_reset>'%s' "
"FROM pg_stat_archiver ",
previous_pgstatarchiver->stats_reset);
/* make the call */
res = PQexec(conn, sql);
/* check and deal with errors */
if (!res || PQresultStatus(res) > 2)
{
pg_log_warning("query failed: %s", PQerrorMessage(conn));
PQclear(res);
PQfinish(conn);
pg_log_error("query was: %s", sql);
exit(EXIT_FAILURE);
}
/* get the number of fields */
nrows = PQntuples(res);
/* for each row, dump the information */
/* this is stupid, a simple if would do the trick, but it will help for other cases */
for (row = 0; row < nrows; row++)
{
column = 0;
/* getting new values */
archived_count = atol(PQgetvalue(res, row, column++));
failed_count = atol(PQgetvalue(res, row, column++));
stats_reset = PQgetvalue(res, row, column++);
has_been_reset = strcmp(PQgetvalue(res, row, column++), "f") && strcmp(previous_pgstatarchiver->stats_reset, PGSTAT_OLDEST_STAT_RESET);
if (has_been_reset)
{
(void)printf("pg_stat_archiver has been reset!\n");
}
/* printing the diff...
* note that the first line will be the current value, rather than the diff */
(void)printf(" %6ld %6ld\n",
archived_count - previous_pgstatarchiver->archived_count,
failed_count - previous_pgstatarchiver->failed_count
);
/* setting the new old value */
previous_pgstatarchiver->archived_count = archived_count;
previous_pgstatarchiver->failed_count = failed_count;
previous_pgstatarchiver->stats_reset = stats_reset;
}
/* cleanup */
PQclear(res);
}
/*
* Dump all bgwriter stats.
*/
void
print_pgstatbgwriter()
{
char sql[PGSTAT_DEFAULT_STRING_SIZE];
PGresult *res;
int nrows;
int row, column;
long checkpoints_timed = 0;
long checkpoints_req = 0;
long checkpoint_write_time = 0;
long checkpoint_sync_time = 0;
long buffers_checkpoint = 0;
long buffers_clean = 0;
long maxwritten_clean = 0;
long buffers_backend = 0;
long buffers_backend_fsync = 0;
long buffers_alloc = 0;
char *stats_reset;
bool has_been_reset;
/* grab the stats (this is the only stats on one line) */
snprintf(sql, sizeof(sql),
"SELECT checkpoints_timed, checkpoints_req, %sbuffers_checkpoint, buffers_clean, "
"maxwritten_clean, buffers_backend, %sbuffers_alloc, stats_reset, stats_reset>'%s' "
"FROM pg_stat_bgwriter ",
backend_minimum_version(9, 2) ? "checkpoint_write_time, checkpoint_sync_time, " : "",
backend_minimum_version(9, 1) ? "buffers_backend_fsync, " : "",
previous_pgstatbgwriter->stats_reset);
/* make the call */
res = PQexec(conn, sql);
/* check and deal with errors */
if (!res || PQresultStatus(res) > 2)
{
pg_log_warning("query failed: %s", PQerrorMessage(conn));
PQclear(res);
PQfinish(conn);
pg_log_error("query was: %s", sql);
exit(EXIT_FAILURE);
}
/* get the number of fields */
nrows = PQntuples(res);
/* for each row, dump the information */
/* this is stupid, a simple if would do the trick, but it will help for other cases */
for (row = 0; row < nrows; row++)
{
column = 0;
/* getting new values */
checkpoints_timed = atol(PQgetvalue(res, row, column++));
checkpoints_req = atol(PQgetvalue(res, row, column++));
if (backend_minimum_version(9, 2))
{
checkpoint_write_time = atol(PQgetvalue(res, row, column++));
checkpoint_sync_time = atol(PQgetvalue(res, row, column++));
}
buffers_checkpoint = atol(PQgetvalue(res, row, column++));
buffers_clean = atol(PQgetvalue(res, row, column++));
maxwritten_clean = atol(PQgetvalue(res, row, column++));
buffers_backend = atol(PQgetvalue(res, row, column++));
if (backend_minimum_version(9, 1))
{
buffers_backend_fsync = atol(PQgetvalue(res, row, column++));
}
buffers_alloc = atol(PQgetvalue(res, row, column++));
stats_reset = PQgetvalue(res, row, column++);
has_been_reset = strcmp(PQgetvalue(res, row, column++), "f") && strcmp(previous_pgstatbgwriter->stats_reset, PGSTAT_OLDEST_STAT_RESET);
if (has_been_reset)
{
(void)printf("pg_stat_bgwriter has been reset!\n");
}
/* printing the diff...
* note that the first line will be the current value, rather than the diff */
(void)printf(" %6ld %6ld %6ld %6ld %6ld %6ld %6ld %6ld %4ld %2ld\n",
checkpoints_timed - previous_pgstatbgwriter->checkpoints_timed,
checkpoints_req - previous_pgstatbgwriter->checkpoints_req,
checkpoint_write_time - previous_pgstatbgwriter->checkpoint_write_time,
checkpoint_sync_time - previous_pgstatbgwriter->checkpoint_sync_time,
buffers_checkpoint - previous_pgstatbgwriter->buffers_checkpoint,
buffers_clean - previous_pgstatbgwriter->buffers_clean,
buffers_backend - previous_pgstatbgwriter->buffers_backend,
buffers_alloc - previous_pgstatbgwriter->buffers_alloc,
maxwritten_clean - previous_pgstatbgwriter->maxwritten_clean,
buffers_backend_fsync - previous_pgstatbgwriter->buffers_backend_fsync
);
/* setting the new old value */
previous_pgstatbgwriter->checkpoints_timed = checkpoints_timed;
previous_pgstatbgwriter->checkpoints_req = checkpoints_req;
previous_pgstatbgwriter->checkpoint_write_time = checkpoint_write_time;
previous_pgstatbgwriter->checkpoint_sync_time = checkpoint_sync_time;
previous_pgstatbgwriter->buffers_checkpoint = buffers_checkpoint;
previous_pgstatbgwriter->buffers_clean = buffers_clean;
previous_pgstatbgwriter->maxwritten_clean = maxwritten_clean;
previous_pgstatbgwriter->buffers_backend = buffers_backend;
previous_pgstatbgwriter->buffers_backend_fsync = buffers_backend_fsync;
previous_pgstatbgwriter->buffers_alloc = buffers_alloc;
previous_pgstatbgwriter->stats_reset = stats_reset;
}
/* cleanup */
PQclear(res);
}
/*
* Dump all connection stats.
*/
void
print_pgstatconnection()
{
char sql[PGSTAT_DEFAULT_STRING_SIZE];
PGresult *res;
int nrows;
int row, column;
long total = 0;
long active = 0;
long lockwaiting = 0;
long idleintransaction = 0;
long idle = 0;
if (backend_minimum_version(10, 0))
{
snprintf(sql, sizeof(sql),
"SELECT count(*) AS total, "
" sum(CASE WHEN state='active' AND wait_event IS NULL "
"THEN 1 ELSE 0 END) AS active, "
" sum(CASE WHEN state='active' AND wait_event IS NOT NULL "
"THEN 1 ELSE 0 END) AS lockwaiting, "
" sum(CASE WHEN state='idle in transaction' THEN 1 ELSE 0 END) AS idleintransaction, "
" sum(CASE WHEN state='idle' THEN 1 ELSE 0 END) AS idle "
"FROM pg_stat_activity "
"WHERE backend_type='client backend'");
}
else if (backend_minimum_version(9, 6))
{
snprintf(sql, sizeof(sql),
"SELECT count(*) AS total, "
" sum(CASE WHEN state='active' AND wait_event IS NULL THEN 1 ELSE 0 END) AS active, "
" sum(CASE WHEN state='active' AND wait_event IS NOT NULL THEN 1 ELSE 0 END) AS lockwaiting, "
" sum(CASE WHEN state='idle in transaction' THEN 1 ELSE 0 END) AS idleintransaction, "
" sum(CASE WHEN state='idle' THEN 1 ELSE 0 END) AS idle "
"FROM pg_stat_activity");
}
else
{
snprintf(sql, sizeof(sql),
"SELECT count(*) AS total, "
" sum(CASE WHEN state='active' AND NOT waiting THEN 1 ELSE 0 END) AS active, "
" sum(CASE WHEN waiting THEN 1 ELSE 0 END) AS lockwaiting, "
" sum(CASE WHEN state='idle in transaction' THEN 1 ELSE 0 END) AS idleintransaction, "
" sum(CASE WHEN state='idle' THEN 1 ELSE 0 END) AS idle "
"FROM pg_stat_activity");
}
res = PQexec(conn, sql);
/* check and deal with errors */
if (!res || PQresultStatus(res) > 2)
{
pg_log_warning("query failed: %s", PQerrorMessage(conn));