Shows how to access database and table statistics.
#include <test_util.h>
void get_stat(
WT_CURSOR *cursor,
int stat_field, int64_t *valuep);
static const char *home;
void
{
const char *desc, *pvalue;
int64_t value;
int ret;
while ((ret = cursor->
next(cursor)) == 0) {
error_check(cursor->
get_value(cursor, &desc, &pvalue, &value));
if (value != 0)
printf("%s=%s\n", desc, pvalue);
}
}
void
{
error_check(session->
open_cursor(session,
"statistics:", NULL, NULL, &cursor));
print_cursor(cursor);
error_check(cursor->
close(cursor));
}
void
{
error_check(session->
open_cursor(session,
"statistics:table:access", NULL, NULL, &cursor));
print_cursor(cursor);
error_check(cursor->
close(cursor));
}
void
{
WT_CURSOR *idx_cursor, *join_cursor, *stat_cursor;
error_check(session->
create(session,
"index:access:idx",
"columns=(v)"));
error_check(session->
open_cursor(session,
"index:access:idx", NULL, NULL, &idx_cursor));
error_check(idx_cursor->
next(idx_cursor));
error_check(session->
open_cursor(session,
"join:table:access", NULL, NULL, &join_cursor));
error_check(session->
join(session, join_cursor, idx_cursor,
"compare=gt"));
print_cursor(join_cursor);
error_check(session->
open_cursor(session,
"statistics:join", join_cursor, NULL, &stat_cursor));
print_cursor(stat_cursor);
error_check(stat_cursor->
close(stat_cursor));
error_check(join_cursor->
close(join_cursor));
error_check(idx_cursor->
close(idx_cursor));
}
void
{
error_check(session->
open_cursor(session,
"statistics:session", NULL, NULL, &stat_cursor));
print_cursor(stat_cursor);
error_check(stat_cursor->
close(stat_cursor));
}
void
{
const char *desc, *pvalue;
int64_t value;
error_check(session->
open_cursor(session,
"statistics:table:access", NULL, NULL, &cursor));
error_check(cursor->
search(cursor));
error_check(cursor->
get_value(cursor, &desc, &pvalue, &value));
printf("%s=%s\n", desc, pvalue);
error_check(cursor->
close(cursor));
}
void
get_stat(
WT_CURSOR *cursor,
int stat_field, int64_t *valuep)
{
const char *desc, *pvalue;
cursor->
set_key(cursor, stat_field);
error_check(cursor->
search(cursor));
error_check(cursor->
get_value(cursor, &desc, &pvalue, valuep));
}
void
{
error_check(session->
open_cursor(session,
"statistics:table:access", NULL, NULL, &cursor));
{
int64_t ckpt_size, file_size, percent;
percent = 0;
if (file_size != 0)
percent = 100 * ((file_size - ckpt_size) / file_size);
printf("Table is %" PRId64 "%% fragmented\n", percent);
}
{
int64_t app_insert, app_remove, app_update, fs_writes;
if (app_insert + app_remove + app_update != 0)
printf("Write amplification is %.2lf\n",
(double)fs_writes / (app_insert + app_remove + app_update));
}
error_check(cursor->
close(cursor));
}
int
main(int argc, char *argv[])
{
home = example_setup(argc, argv);
error_check(
wiredtiger_open(home, NULL,
"create,statistics=(all)", &conn));
error_check(conn->
open_session(conn, NULL, NULL, &session));
error_check(
session->
create(session,
"table:access",
"key_format=S,value_format=S,columns=(k,v)"));
error_check(session->
open_cursor(session,
"table:access", NULL, NULL, &cursor));
error_check(cursor->
insert(cursor));
error_check(cursor->
close(cursor));
print_database_stats(session);
print_file_stats(session);
print_join_cursor_stats(session);
print_session_stats(session);
print_overflow_pages(session);
print_derived_stats(session);
error_check(conn->
close(conn, NULL));
return (EXIT_SUCCESS);
}
#define WT_STAT_DSRC_BTREE_OVERFLOW
btree: overflow pages, only reported if tree_walk or all statistics are enabled
Definition wiredtiger.in:7358
#define WT_STAT_DSRC_CACHE_BYTES_WRITE
cache: bytes written from cache
Definition wiredtiger.in:7381
#define WT_STAT_DSRC_CURSOR_UPDATE_BYTES
cursor: update key and value bytes
Definition wiredtiger.in:7966
#define WT_STAT_DSRC_BLOCK_SIZE
block-manager: file size in bytes
Definition wiredtiger.in:7286
#define WT_STAT_DSRC_BLOCK_CHECKPOINT_SIZE
block-manager: checkpoint size
Definition wiredtiger.in:7276
#define WT_NOTFOUND
Item not found.
Definition wiredtiger.in:4140
int wiredtiger_open(const char *home, WT_EVENT_HANDLER *event_handler, const char *config, WT_CONNECTION **connectionp)
Open a connection to a database.
#define WT_STAT_DSRC_CURSOR_INSERT_BYTES
cursor: insert key and value bytes
Definition wiredtiger.in:7932
#define WT_STAT_DSRC_CURSOR_REMOVE_BYTES
cursor: remove key bytes removed
Definition wiredtiger.in:7950
A connection to a WiredTiger database.
Definition wiredtiger.in:2106
int open_session(WT_CONNECTION *connection, WT_EVENT_HANDLER *event_handler, const char *config, WT_SESSION **sessionp)
int close(WT_CONNECTION *connection, const char *config)
A WT_CURSOR handle is the interface to a cursor.
Definition wiredtiger.in:199
int next(WT_CURSOR *cursor)
Return the next record.
void set_value(WT_CURSOR *cursor,...)
Set the value for the next operation.
int search(WT_CURSOR *cursor)
Return the record matching the key.
int insert(WT_CURSOR *cursor)
Insert a record and optionally update an existing record.
void set_key(WT_CURSOR *cursor,...)
Set the key for the next operation.
int close(WT_CURSOR *cursor)
Close the cursor.
int get_value(WT_CURSOR *cursor,...)
Get the value for the current record.
All data operations are performed in the context of a WT_SESSION.
Definition wiredtiger.in:822
int create(WT_SESSION *session, const char *name, const char *config)
int checkpoint(WT_SESSION *session, const char *config)
int join(WT_SESSION *session, WT_CURSOR *join_cursor, WT_CURSOR *ref_cursor, const char *config)
int open_cursor(WT_SESSION *session, const char *uri, WT_CURSOR *to_dup, const char *config, WT_CURSOR **cursorp)