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Add macro for maximum statistics target

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The number of places where 10000 was hardcoded had grown a bit beyond
the comfort level.  Introduce a macro MAX_STATISTICS_TARGET instead.

Reviewed-by: Tomas Vondra <tomas.vondra@enterprisedb.com>
Discussion: https://www.postgresql.org/message-id/flat/d6069765-5971-04d3-c10d-e4f7b2e9c459%40eisentraut.org
This commit is contained in:
Peter Eisentraut 2023-07-03 07:09:22 +02:00
parent 3ee2f25d21
commit 7a7f60aef8
7 changed files with 17 additions and 9 deletions
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4
src/backend/commands/statscmds.c
View File

@ -619,9 +619,9 @@ AlterStatistics(AlterStatsStmt *stmt)
errmsg("statistics target %d is too low",
newtarget)));
}
else if (newtarget > 10000)
else if (newtarget > MAX_STATISTICS_TARGET)
{
newtarget = 10000;
newtarget = MAX_STATISTICS_TARGET;
ereport(WARNING,
(errcode(ERRCODE_INVALID_PARAMETER_VALUE),
errmsg("lowering statistics target to %d",

5
src/backend/commands/tablecmds.c
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@ -61,6 +61,7 @@
#include "commands/trigger.h"
#include "commands/typecmds.h"
#include "commands/user.h"
#include "commands/vacuum.h"
#include "executor/executor.h"
#include "foreign/fdwapi.h"
#include "foreign/foreign.h"
@ -8180,9 +8181,9 @@ ATExecSetStatistics(Relation rel, const char *colName, int16 colNum, Node *newVa
errmsg("statistics target %d is too low",
newtarget)));
}
else if (newtarget > 10000)
else if (newtarget > MAX_STATISTICS_TARGET)
{
newtarget = 10000;
newtarget = MAX_STATISTICS_TARGET;
ereport(WARNING,
(errcode(ERRCODE_INVALID_PARAMETER_VALUE),
errmsg("lowering statistics target to %d",

2
src/backend/statistics/extended_stats.c
View File

@ -379,7 +379,7 @@ statext_compute_stattarget(int stattarget, int nattrs, VacAttrStats **stats)
stattarget = default_statistics_target;
/* As this point we should have a valid statistics target. */
Assert((stattarget >= 0) && (stattarget <= 10000));
Assert((stattarget >= 0) && (stattarget <= MAX_STATISTICS_TARGET));
return stattarget;
}

2
src/backend/utils/misc/guc_tables.c
View File

@ -2035,7 +2035,7 @@ struct config_int ConfigureNamesInt[] =
"column-specific target set via ALTER TABLE SET STATISTICS.")
},
&default_statistics_target,
100, 1, 10000,
100, 1, MAX_STATISTICS_TARGET,
NULL, NULL, NULL
},
{

2
src/include/catalog/pg_attribute.h
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@ -165,7 +165,7 @@ CATALOG(pg_attribute,1249,AttributeRelationId) BKI_BOOTSTRAP BKI_ROWTYPE_OID(75,
* that no value has been explicitly set for this column, so ANALYZE
* should use the default setting.
*
* int16 is sufficient because the max value is currently 10000.
* int16 is sufficient for the current max value (MAX_STATISTICS_TARGET).
*/
int16 attstattarget BKI_DEFAULT(-1);

7
src/include/commands/vacuum.h
View File

@ -305,6 +305,13 @@ extern PGDLLIMPORT int vacuum_multixact_freeze_table_age;
extern PGDLLIMPORT int vacuum_failsafe_age;
extern PGDLLIMPORT int vacuum_multixact_failsafe_age;
/*
* Maximum value for default_statistics_target and per-column statistics
* targets. This is fairly arbitrary, mainly to prevent users from creating
* unreasonably large statistics that the system cannot handle well.
*/
#define MAX_STATISTICS_TARGET 10000
/* Variables for cost-based parallel vacuum */
extern PGDLLIMPORT pg_atomic_uint32 *VacuumSharedCostBalance;
extern PGDLLIMPORT pg_atomic_uint32 *VacuumActiveNWorkers;

4
src/include/statistics/statistics.h
View File

@ -66,8 +66,8 @@ typedef struct MVDependencies
#define STATS_MCV_MAGIC 0xE1A651C2 /* marks serialized bytea */
#define STATS_MCV_TYPE_BASIC 1 /* basic MCV list type */
/* max items in MCV list (should be equal to max default_statistics_target) */
#define STATS_MCVLIST_MAX_ITEMS 10000
/* max items in MCV list */
#define STATS_MCVLIST_MAX_ITEMS MAX_STATISTICS_TARGET
/*
* Multivariate MCV (most-common value) lists