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PG-186: Add support to monitor query execution plan.

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This requires refactoring of code to add this functionality. Along with
that this patch contains regression test cases.
This commit is contained in:
Ibrar Ahmed
2021-03-12 18:55:12 +00:00
parent 8f69daa5dd
commit 066162c3f6
34 changed files with 10234 additions and 1173 deletions
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65
pg_stat_monitor.h
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@@ -79,7 +79,7 @@
#define CMD_LEN 20
#define APPLICATIONNAME_LEN 100
#define PGSM_OVER_FLOW_MAX 10
#define PLAN_TEXT_LEN 1024
/* the assumption of query max nested level */
#define DEFAULT_MAX_NESTED_LEVEL 10
@@ -94,9 +94,9 @@
#define SQLCODE_LEN 20
#if PG_VERSION_NUM >= 130000
#define MAX_SETTINGS 13
#define MAX_SETTINGS 14
#else
#define MAX_SETTINGS 12
#define MAX_SETTINGS 13
#endif
typedef struct GucVariables
@@ -149,6 +149,15 @@ typedef enum AGG_KEY
#define MAX_QUERY_LEN 1024
/* shared nenory storage for the query */
typedef struct CallTime
{
double total_time; /* total execution time, in msec */
double min_time; /* minimum execution time in msec */
double max_time; /* maximum execution time in msec */
double mean_time; /* mean execution time in msec */
double sum_var_time; /* sum of variances in execution time in msec */
} CallTime;
typedef struct pgssQueryHashKey
{
uint64 queryid; /* query identifier */
@@ -161,6 +170,27 @@ typedef struct pgssQueryEntry
uint64 pos; /* bucket number */
} pgssQueryEntry;
typedef struct PlanInfo
{
uint64 planid; /* plan identifier */
uint64 plans; /* how many times plan */
CallTime time;
char plan_text[PLAN_TEXT_LEN]; /* plan text */
} PlanInfo;
/* shared nenory storage for the query */
typedef struct pgssPlanHashKey
{
uint64 query_hash; /* query reference identifier */
} pgssPlanHashKey;
typedef struct pgssPlanEntry
{
pgssPlanHashKey key; /* hash key of entry - MUST BE FIRST */
PlanInfo plan_info; /* planning information */
slock_t mutex; /* protects the counters only */
} pgssPlanEntry;
typedef struct pgssHashKey
{
uint64 bucket_id; /* bucket number */
@@ -187,7 +217,7 @@ typedef struct QueryInfo
typedef struct ErrorInfo
{
int64 elevel; /* error elevel */
char sqlcode[SQLCODE_LEN]; /* error sqlcode */
char sqlcode[SQLCODE_LEN]; /* error sqlcode */
char message[ERROR_MESSAGE_LEN]; /* error message text */
} ErrorInfo;
@@ -198,14 +228,6 @@ typedef struct Calls
double usage; /* usage factor */
} Calls;
typedef struct CallTime
{
double total_time; /* total execution time, in msec */
double min_time; /* minimum execution time in msec */
double max_time; /* maximum execution time in msec */
double mean_time; /* mean execution time in msec */
double sum_var_time; /* sum of variances in execution time in msec */
} CallTime;
typedef struct Blocks
{
@@ -235,15 +257,14 @@ typedef struct Wal_Usage
int64 wal_fpi; /* # of WAL full page images generated */
uint64 wal_bytes; /* total amount of WAL bytes generated */
} Wal_Usage;
/*
* The actual stats counters kept within pgssEntry.
*/
typedef struct Counters
{
uint64 bucket_id; /* bucket id */
Calls calls[PGSS_NUMKIND];
Calls calls;
QueryInfo info;
CallTime time[PGSS_NUMKIND];
PlanInfo plan_info;
CallTime time;
Blocks blocks;
SysInfo sysinfo;
ErrorInfo error;
@@ -340,18 +361,19 @@ void pgss_shmem_startup(void);
void pgss_shmem_shutdown(int code, Datum arg);
int pgsm_get_bucket_size(void);
pgssSharedState* pgsm_get_ss(void);
HTAB* pgsm_get_hash(void);
HTAB *pgsm_get_plan_hash(void);
HTAB *pgsm_get_hash(void);
HTAB *pgsm_get_plan_hash(void);
HTAB* pgsm_get_query_hash(void);
void hash_entry_reset(void);
void hash_query_entry_dealloc(int bucket);
void hash_entry_dealloc(int bucket);
pgssPlanEntry *hash_plan_entry_alloc(pgssSharedState *pgss, pgssPlanHashKey *key);
pgssEntry* hash_entry_alloc(pgssSharedState *pgss, pgssHashKey *key, int encoding);
Size hash_memsize(void);
bool hash_find_query_entry(uint64 bucket_id, uint64 queryid);
bool hash_create_query_entry(uint64 bucket_id, uint64 queryid);
/* hash_query.c */
void pgss_startup(void);
void set_qbuf(int i, unsigned char *);
@@ -369,7 +391,8 @@ void pgss_startup(void);
#define PGSM_HISTOGRAM_MAX get_conf(8)->guc_variable
#define PGSM_HISTOGRAM_BUCKETS get_conf(9)->guc_variable
#define PGSM_QUERY_SHARED_BUFFER get_conf(10)->guc_variable
#define PGSM_TRACK_PLANNING get_conf(11)->guc_variable
#define PGSM_OVERFLOW_TARGET get_conf(12)->guc_variable
#define PGSM_QUERY_PLAN get_conf(12)->guc_variable
#define PGSM_TRACK_PLANNING get_conf(13)->guc_variable
#endif