EXPLAIN (Transact-SQL)
Applicare a:
Un pool SQL dedicato in Azure Synapse Analytics
Restituisce il piano di query per un'istruzione SQL di Azure Synapse Analytics senza eseguire l'istruzione. Usare EXPLAIN per un'anteprima delle operazioni che richiedono lo spostamento di dati e per visualizzare i costi stimati delle operazioni di query. WITH RECOMMENDATIONS si applica ad Azure Synapse Analytics.
Sintassi
EXPLAIN [WITH_RECOMMENDATIONS] SQL_statement
[;]
Nota
Questa sintassi non è supportata da pool SQL serverless in Azure Synapse Analytics.
Argomenti
SQL_statement
L'istruzione SQL per la quale verrà eseguita l'istruzione EXPLAIN. SQL_statement può essere uno qualsiasi dei comandi seguenti: SELECT, INSERT, UPDATE, DELETE, CREATE TABLE AS SELECT, CREATE REMOTE TABLE.
WITH_RECOMMENDATIONS
Restituire il piano di query con raccomandazioni per ottimizzare le prestazioni delle istruzioni SQL.
Autorizzazioni
È necessaria l'autorizzazione SHOWPLAN autorizzazione e l'autorizzazione per eseguire SQL_statement. Vedere Autorizzazioni: GRANT, DENY, REVOKE (Azure Synapse Analytics, Parallel Data Warehouse).
Valore restituito
Il valore restituito dal comando EXPLAIN è un documento XML. Questo documento XML elenca tutte le operazioni nel piano di query per la query specificata, ognuna racchiuso nel tag <dsql_operation>. Il valore restituito è di tipo nvarchar(max).
Il piano di query restituito illustra istruzioni SQL sequenziali. Quando la query viene eseguita, può implicare operazioni eseguite in parallelo e quindi alcune delle istruzioni sequenziali illustrate possono essere eseguite contemporaneamente.
La struttura del codice XML del valore restituito è simile alla seguente:
\<?xml version="1.0" encoding="utf-8"?>
<dsql_query>
<sql>. . .</sql>
<params />
<dsql_operations>
<dsql_operation>
. . .
</dsql_operation>
[ . . . n ]
<dsql_operations>
</dsql_query>
I tag XML contengono queste informazioni:
| Tag XML | Riepilogo, attributi e contenuto |
|---|---|
| <dsql_query> | Elemento di livello superiore o documento. |
| <sql> | Esegue l'eco di SQL_statement. |
| <params> | Tag attualmente non usato. |
| <materialized_view_candidates> (anteprima) | Contiene l'istruzione CREATE della vista materializzata consigliata per ottenere prestazioni migliori dell'istruzione SQL. |
| <dsql_operations> | Riepiloga e contiene i passaggi della query e include informazioni sui costi per la query. Contiene anche tutti i blocchi <dsql_operation>. Questo tag contiene informazioni relative ai conteggi per l'intera query:<dsql_operations total_cost=total_cost total_number_operations=total_number_operations>total_cost è il tempo stimato totale per l'esecuzione della query in ms. total_number_operations è il numero totale di operazioni per la query. Un'operazione da eseguire in parallelo in più nodi viene conteggiata come operazione singola. |
| <dsql_operation> | Descrive una singola operazione all'interno del piano di query. Il tag <dsql_operation> contiene il tipo di operazione come attributo:<dsql_operation operation_type=operation_type>operation_type è uno dei valori trovati in sys.dm_pdw_request_steps (Transact-SQL). Il contenuto del blocco \<dsql_operation> dipende dal tipo di operazione.Vedi la tabella seguente. |
| Tipo di operazione | Sommario | Esempio |
|---|---|---|
| BROADCAST_MOVE, DISTRIBUTE_REPLICATED_TABLE_MOVE, MASTER_TABLE_MOVE, PARTITION_MOVE, SHUFFLE_MOVE e TRIM_MOVE | Elemento <operation_cost> con questi attributi. I valori riflettono solo l'operazione locale:- cost è il costo dell'operatore locale e visualizza il tempo stimato per l'operazione da eseguire, in ms. - accumulative_cost è la somma di tutte le operazioni visualizzate nel piano inclusa la somma dei valori di operazioni parallele, in ms. - average_rowsize è la dimensione media stimata (in byte) delle righe recuperate e passate durante l'operazione. - output_rows è la cardinalità di output (nodo) e visualizza il numero di righe di output. <location>: i nodi o le distribuzioni in cui verrà eseguita l'operazione. Le opzioni sono: "Control", "ComputeNode", "AllComputeNodes", "AllDistributions", "SubsetDistributions", "Distribution" e "SubsetNodes".<source_statement>: i dati di origine per lo spostamento casuale.<destination_table>: la tabella temporanea interna in cui i dati verranno spostati.<shuffle_columns>: applicabile solo alle operazioni SHUFFLE_MOVE. Una o più colonne che verranno usate come colonne di distribuzione per la tabella temporanea. |
<operation_cost cost="40" accumulative_cost="40" average_rowsize = "50" output_rows="100"/><location distribution="AllDistributions" /><source_statement type="statement">SELECT [TableAlias_3b77ee1d8ccf4a94ba644118b355db9d].[dist_date] FROM [qatest].[dbo].[flyers] [TableAlias_3b77ee1d8ccf4a94ba644118b355db9d] </source_statement><destination_table>Q_[TEMP_ID_259]_[PARTITION_ID]</destination_table><shuffle_columns>dist_date;</shuffle_columns><shuffle_columns>Email;Date;</shuffle_columns> |
| MetaDataCreate_Operation | <source_table>: la tabella di origine per l'operazione.<destination_table>: la tabella di destinazione per l'operazione. |
<source_table>databases</source_table><destination_table>MetaDataCreateLandingTempTable</destination_table> |
| In... | <location>: vedere<location>.<sql_operation>: identifica il comando SQL che verrà eseguito in un nodo. |
<location permanent="false" distribution="AllDistributions">Compute</location><sql_operation type="statement">CREATE TABLE [tempdb].[dbo]. [Q_[TEMP_ID_259]]_ [PARTITION_ID]]]([dist_date] DATE) WITH (DISTRIBUTION = HASH([dist_date]),) </sql_operation> |
| RemoteOnOperation | <DestinationCatalog>: il catalogo di destinazione.<DestinationSchema>: lo schema di destinazione in DestinationCatalog.<DestinationTableName>: il nome della tabella di destinazione o "TableName".<DestinationDatasource>: il nome dell'origine dati di destinazione.<Username> e <Password>: questi campi indicano che la destinazione può richiedere un nome utente e una password.<CreateStatement>: l'istruzione per la creazione della tabella per il database di destinazione. |
<DestinationCatalog>master</DestinationCatalog><DestinationSchema>dbo</DestinationSchema><DestinationTableName>TableName</DestinationTableName><DestinationDatasource>DestDataSource</DestinationDatasource><Username>...</Username><Password>...</Password><CreateStatement>CREATE TABLE [master].[dbo].[TableName] ([col1] BIGINT) ON [PRIMARY] WITH(DATA_COMPRESSION=PAGE);</CreateStatement> |
| RETURN | <resultset>: l'identificatore per il set di risultati. |
<resultset>RS_19</resultset> |
| RND_ID | <identifier>: l'identificatore per l'oggetto creato. |
<identifier>TEMP_ID_260</identifier> |
Limitazioni e restrizioni
È possibile applicare EXPLAIN solo a query a ottimizzabili, ovvero a query che possono essere migliorate o modificate in base ai risultati di un comando EXPLAIN. I comandi EXPLAIN supportati sono disponibili nella sezione precedente. Se si tenta di usare EXPLAIN con un tipo di query non supportato, verrà restituito un errore o verrà eseguito l'eco della query.
EXPLAIN non è supportato nelle transazioni utente.
Esempi
L'esempio seguente illustra un comando EXPLAIN eseguito per un'istruzione SELECT e il risultato XML.
Invio di un'istruzione EXPLAIN
Il comando inviato per questo esempio è:
-- Uses AdventureWorks
EXPLAIN
SELECT CAST (AVG(YearlyIncome) AS int) AS AverageIncome,
CAST(AVG(FIS.SalesAmount) AS int) AS AverageSales,
G.StateProvinceName, T.SalesTerritoryGroup
FROM dbo.DimGeography AS G
JOIN dbo.DimSalesTerritory AS T
ON G.SalesTerritoryKey = T.SalesTerritoryKey
JOIN dbo.DimCustomer AS C
ON G.GeographyKey = C.GeographyKey
JOIN dbo.FactInternetSales AS FIS
ON C.CustomerKey = FIS.CustomerKey
WHERE T.SalesTerritoryGroup IN ('North America', 'Pacific')
AND Gender = 'F'
GROUP BY G.StateProvinceName, T.SalesTerritoryGroup
ORDER BY AVG(YearlyIncome) DESC;
GO
Dopo l'esecuzione dell'istruzione con l'opzione EXPLAIN, la scheda dei messaggi presenta una sola riga denominata explain che inizia con il testo XML \<?xml version="1.0" encoding="utf-8"?> Selezionare l'XML per aprire l'intero testo in un finestra XML. Per comprendere meglio i commenti seguenti, è necessario attivare la visualizzazione dei numeri di riga in SSDT.
Attivare i numeri di riga
Con l'output visualizzato nella scheda explain di SSDT selezionare Opzioni dal menu STRUMENTI.
Espandere la sezione Editor di testo, espandere XML e quindi selezionare Generale.
Nell'area Visualizzazione selezionare Numeri di riga.
Seleziona OK.
Output di EXPLAIN di esempio
L'XML risultante del comando EXPLAIN con i numeri di riga attivati è il seguente:
1 \<?xml version="1.0" encoding="utf-8"?>
2 <dsql_query>
3 <sql>SELECT CAST (AVG(YearlyIncome) AS int) AS AverageIncome,
4 CAST(AVG(FIS.SalesAmount) AS int) AS AverageSales,
5 G.StateProvinceName, T.SalesTerritoryGroup
6 FROM dbo.DimGeography AS G
7 JOIN dbo.DimSalesTerritory AS T
8 ON G.SalesTerritoryKey = T.SalesTerritoryKey
9 JOIN dbo.DimCustomer AS C
10 ON G.GeographyKey = C.GeographyKey
11 JOIN dbo.FactInternetSales AS FIS
12 ON C.CustomerKey = FIS.CustomerKey
13 WHERE T.SalesTerritoryGroup IN ('North America', 'Pacific')
14 AND Gender = 'F'
15 GROUP BY G.StateProvinceName, T.SalesTerritoryGroup
16 ORDER BY AVG(YearlyIncome) DESC</sql>
17 <dsql_operations total_cost="0.926237696" total_number_operations="9">
18 <dsql_operation operation_type="RND_ID">
19 <identifier>TEMP_ID_16893</identifier>
20 </dsql_operation>
21 <dsql_operation operation_type="ON">
22 <location permanent="false" distribution="AllComputeNodes" />
23 <sql_operations>
24 <sql_operation type="statement">CREATE TABLE [tempdb].[dbo].[TEMP_ID_16893] ([CustomerKey] INT NOT NULL, [GeographyKey] INT, [YearlyIncome] MONEY ) WITH(DATA_COMPRESSION=PAGE);</sql_operation>
25 </sql_operations>
26 </dsql_operation>
27 <dsql_operation operation_type="BROADCAST_MOVE">
28 <operation_cost cost="0.121431552" accumulative_cost="0.121431552" average_rowsize="16" output_rows="31.6228" />
29 <source_statement>SELECT [T1_1].[CustomerKey] AS [CustomerKey],
30 [T1_1].[GeographyKey] AS [GeographyKey],
31 [T1_1].[YearlyIncome] AS [YearlyIncome]
32 FROM (SELECT [T2_1].[CustomerKey] AS [CustomerKey],
33 [T2_1].[GeographyKey] AS [GeographyKey],
34 [T2_1].[YearlyIncome] AS [YearlyIncome]
35 FROM [AdventureWorksPDW2012].[dbo].[DimCustomer] AS T2_1
36 WHERE ([T2_1].[Gender] = CAST (N'F' COLLATE Latin1_General_100_CI_AS_KS_WS AS NVARCHAR (1)) COLLATE Latin1_General_100_CI_AS_KS_WS)) AS T1_1</source_statement>
37 <destination_table>[TEMP_ID_16893]</destination_table>
38 </dsql_operation>
39 <dsql_operation operation_type="RND_ID">
40 <identifier>TEMP_ID_16894</identifier>
41 </dsql_operation>
42 <dsql_operation operation_type="ON">
43 <location permanent="false" distribution="AllDistributions" />
44 <sql_operations>
45 <sql_operation type="statement">CREATE TABLE [tempdb].[dbo].[TEMP_ID_16894] ([StateProvinceName] NVARCHAR(50) COLLATE Latin1_General_100_CI_AS_KS_WS, [SalesTerritoryGroup] NVARCHAR(50) COLLATE Latin1_General_100_CI_AS_KS_WS NOT NULL, [col] BIGINT, [col1] MONEY NOT NULL, [col2] BIGINT, [col3] MONEY NOT NULL ) WITH(DATA_COMPRESSION=PAGE);</sql_operation>
46 </sql_operations>
47 </dsql_operation>
48 <dsql_operation operation_type="SHUFFLE_MOVE">
49 <operation_cost cost="0.804806144" accumulative_cost="0.926237696" average_rowsize="232" output_rows="108.406" />
50 <source_statement>SELECT [T1_1].[StateProvinceName] AS [StateProvinceName],
51 [T1_1].[SalesTerritoryGroup] AS [SalesTerritoryGroup],
52 [T1_1].[col2] AS [col],
53 [T1_1].[col] AS [col1],
54 [T1_1].[col3] AS [col2],
55 [T1_1].[col1] AS [col3]
56 FROM (SELECT ISNULL([T2_1].[col1], CONVERT (MONEY, 0.00, 0)) AS [col],
57 ISNULL([T2_1].[col3], CONVERT (MONEY, 0.00, 0)) AS [col1],
58 [T2_1].[StateProvinceName] AS [StateProvinceName],
59 [T2_1].[SalesTerritoryGroup] AS [SalesTerritoryGroup],
60 [T2_1].[col] AS [col2],
61 [T2_1].[col2] AS [col3]
62 FROM (SELECT COUNT_BIG([T3_2].[YearlyIncome]) AS [col],
63 SUM([T3_2].[YearlyIncome]) AS [col1],
64 COUNT_BIG(CAST ((0) AS INT)) AS [col2],
65 SUM([T3_2].[SalesAmount]) AS [col3],
66 [T3_2].[StateProvinceName] AS [StateProvinceName],
67 [T3_1].[SalesTerritoryGroup] AS [SalesTerritoryGroup]
68 FROM (SELECT [T4_1].[SalesTerritoryKey] AS [SalesTerritoryKey],
69 [T4_1].[SalesTerritoryGroup] AS [SalesTerritoryGroup]
70 FROM [AdventureWorksPDW2012].[dbo].[DimSalesTerritory] AS T4_1
71 WHERE (([T4_1].[SalesTerritoryGroup] = CAST (N'North America' COLLATE Latin1_General_100_CI_AS_KS_WS AS NVARCHAR (13)) COLLATE Latin1_General_100_CI_AS_KS_WS)
72 OR ([T4_1].[SalesTerritoryGroup] = CAST (N'Pacific' COLLATE Latin1_General_100_CI_AS_KS_WS AS NVARCHAR (7)) COLLATE Latin1_General_100_CI_AS_KS_WS))) AS T3_1
73 INNER JOIN
74 (SELECT [T4_1].[SalesTerritoryKey] AS [SalesTerritoryKey],
75 [T4_2].[YearlyIncome] AS [YearlyIncome],
76 [T4_2].[SalesAmount] AS [SalesAmount],
77 [T4_1].[StateProvinceName] AS [StateProvinceName]
78 FROM [AdventureWorksPDW2012].[dbo].[DimGeography] AS T4_1
79 INNER JOIN
80 (SELECT [T5_2].[GeographyKey] AS [GeographyKey],
81 [T5_2].[YearlyIncome] AS [YearlyIncome],
82 [T5_1].[SalesAmount] AS [SalesAmount]
83 FROM [AdventureWorksPDW2012].[dbo].[FactInternetSales] AS T5_1
84 INNER JOIN
85 [tempdb].[dbo].[TEMP_ID_16893] AS T5_2
86 ON ([T5_1].[CustomerKey] = [T5_2].[CustomerKey])) AS T4_2
87 ON ([T4_2].[GeographyKey] = [T4_1].[GeographyKey])) AS T3_2
88 ON ([T3_1].[SalesTerritoryKey] = [T3_2].[SalesTerritoryKey])
89 GROUP BY [T3_2].[StateProvinceName], [T3_1].[SalesTerritoryGroup]) AS T2_1) AS T1_1</source_statement>
90 <destination_table>[TEMP_ID_16894]</destination_table>
91 <shuffle_columns>StateProvinceName;</shuffle_columns>
92 </dsql_operation>
93 <dsql_operation operation_type="ON">
94 <location permanent="false" distribution="AllComputeNodes" />
95 <sql_operations>
96 <sql_operation type="statement">DROP TABLE [tempdb].[dbo].[TEMP_ID_16893]</sql_operation>
97 </sql_operations>
98 </dsql_operation>
99 <dsql_operation operation_type="RETURN">
100 <location distribution="AllDistributions" />
101 <select>SELECT [T1_1].[col] AS [col],
102 [T1_1].[col1] AS [col1],
103 [T1_1].[StateProvinceName] AS [StateProvinceName],
104 [T1_1].[SalesTerritoryGroup] AS [SalesTerritoryGroup],
105 [T1_1].[col2] AS [col2]
106 FROM (SELECT CONVERT (INT, [T2_1].[col], 0) AS [col],
107 CONVERT (INT, [T2_1].[col1], 0) AS [col1],
108 [T2_1].[StateProvinceName] AS [StateProvinceName],
109 [T2_1].[SalesTerritoryGroup] AS [SalesTerritoryGroup],
110 [T2_1].[col] AS [col2]
111 FROM (SELECT CASE
112 WHEN ([T3_1].[col] = CAST ((0) AS BIGINT)) THEN CAST (NULL AS MONEY)
113 ELSE ([T3_1].[col1] / CONVERT (MONEY, [T3_1].[col], 0))
114 END AS [col],
115 CASE
116 WHEN ([T3_1].[col2] = CAST ((0) AS BIGINT)) THEN CAST (NULL AS MONEY)
117 ELSE ([T3_1].[col3] / CONVERT (MONEY, [T3_1].[col2], 0))
118 END AS [col1],
119 [T3_1].[StateProvinceName] AS [StateProvinceName],
120 [T3_1].[SalesTerritoryGroup] AS [SalesTerritoryGroup]
121 FROM (SELECT ISNULL([T4_1].[col], CONVERT (BIGINT, 0, 0)) AS [col],
122 ISNULL([T4_1].[col1], CONVERT (MONEY, 0.00, 0)) AS [col1],
123 ISNULL([T4_1].[col2], CONVERT (BIGINT, 0, 0)) AS [col2],
124 ISNULL([T4_1].[col3], CONVERT (MONEY, 0.00, 0)) AS [col3],
125 [T4_1].[StateProvinceName] AS [StateProvinceName],
126 [T4_1].[SalesTerritoryGroup] AS [SalesTerritoryGroup]
127 FROM (SELECT SUM([T5_1].[col]) AS [col],
128 SUM([T5_1].[col1]) AS [col1],
129 SUM([T5_1].[col2]) AS [col2],
130 SUM([T5_1].[col3]) AS [col3],
131 [T5_1].[StateProvinceName] AS [StateProvinceName],
132 [T5_1].[SalesTerritoryGroup] AS [SalesTerritoryGroup]
133 FROM [tempdb].[dbo].[TEMP_ID_16894] AS T5_1
134 GROUP BY [T5_1].[StateProvinceName], [T5_1].[SalesTerritoryGroup]) AS T4_1) AS T3_1) AS T2_1) AS T1_1
135 ORDER BY [T1_1].[col2] DESC</select>
136 </dsql_operation>
137 <dsql_operation operation_type="ON">
138 <location permanent="false" distribution="AllDistributions" />
139 <sql_operations>
140 <sql_operation type="statement">DROP TABLE [tempdb].[dbo].[TEMP_ID_16894]</sql_operation>
141 </sql_operations>
142 </dsql_operation>
143 </dsql_operations>
144 </dsql_query>
Significato dell'output di EXPLAIN
L'output nel precedente blocco di codice contiene 144 righe numerate. L'output della query può essere diverso per diversi utenti. L'elenco seguente descrive le sezioni significative.
Le righe da 3 a 16 forniscono una descrizione della query in corso di analisi.
La riga 17 specifica che il numero totale di operazioni è 9. È possibile individuare l'inizio di ogni operazione cercando le parole dsql_operation.
Alla riga 18 inizia l'operazione 1. Le righe 18 e 19 indicano che un'operazione RND_ID creerà un numero ID casuale che verrà usato per la descrizione di un oggetto. L'oggetto descritto nell'output di esempio è TEMP_ID_16893. Il numero sarà diverso per ogni utente.
Alla riga 20 inizia l'operazione 2. Righe da 21 a 25: in tutti i nodi di calcolo creano una tabella temporanea denominata
TEMP_ID_16893.Alla riga 26 inizia l'operazione 3. Righe da 27 a 37: spostano i dati in
TEMP_ID_16893tramite uno spostamento di trasmissione. Viene fornita la query inviata a ogni nodo di calcolo. La riga 37 specifica che la tabella di destinazione èTEMP_ID_16893.Alla riga 38 inizia l'operazione 4. Righe 39 e 40: creano un ID casuale per una tabella. Nell'esempio, il numero ID è TEMP_ID_16894. Il numero sarà diverso per ogni utente.
Alla riga 41 inizia l'operazione 5. Righe da 42 a 46: in tutti i nodi creano una tabella temporanea denominata
TEMP_ID_16894.Alla riga 47 inizia l'operazione 6. Righe da 48 a 91: spostano i dati da diverse tabelle (inclusa
TEMP_ID_16893) alla tabellaTEMP_ID_16893tramite un'operazione di spostamento casuale. Viene fornita la query inviata a ogni nodo di calcolo. La riga 90 specifica che la tabella di destinazione èTEMP_ID_16894. La riga 91 specifica le colonne.Alla riga 92 inizia l'operazione 7. Righe da 93 a 97: in tutti i nodi di calcolo rilasciano la tabella temporanea
TEMP_ID_16893.Alla riga 98 inizia l'operazione 8. Righe da 99 a 135: restituiscono i risultati al client. Usa la query fornita per ottenere i risultati.
Alla riga 136 inizia l'operazione 9. Righe da 137 a 140: in tutti i nodi rilasciano la tabella temporanea
TEMP_ID_16894.
Invio di un'istruzione EXPLAIN WITH_RECOMMENDATIONS
EXPLAIN WITH_RECOMMENDATIONS
select count(*)
from ((select distinct c_last_name, c_first_name, d_date
from store_sales, date_dim, customer
where store_sales.ss_sold_date_sk = date_dim.d_date_sk
and store_sales.ss_customer_sk = customer.c_customer_sk
and d_month_seq between 1194 and 1194+11)
except
(select distinct c_last_name, c_first_name, d_date
from catalog_sales, date_dim, customer
where catalog_sales.cs_sold_date_sk = date_dim.d_date_sk
and catalog_sales.cs_bill_customer_sk = customer.c_customer_sk
and d_month_seq between 1194 and 1194+11)
) top_customers
Output di esempio per EXPLAIN WITH_RECOMMENDATIONS
L'output di esempio seguente include la creazione di una vista materializzata consigliata chiamata View1.
<?xml version="1.0" encoding="utf-8"?>
<dsql_query number_nodes="1" number_distributions="8" number_distributions_per_node="8">
<sql>select count(*)
from ((select distinct c_last_name, c_first_name, d_date
from store_sales, date_dim, customer
where store_sales.ss_sold_date_sk = date_dim.d_date_sk
and store_sales.ss_customer_sk = customer.c_customer_sk
and d_month_seq between 1194 and 1194+11)
except
(select distinct c_last_name, c_first_name, d_date
from catalog_sales, date_dim, customer
where catalog_sales.cs_sold_date_sk = date_dim.d_date_sk
and catalog_sales.cs_bill_customer_sk = customer.c_customer_sk
and d_month_seq between 1194 and 1194+11)
) top_customers</sql>
<materialized_view_candidates>
<materialized_view_candidates with_constants="False">CREATE MATERIALIZED VIEW View1 WITH (DISTRIBUTION = HASH([Expr0])) AS
SELECT [tpcds10].[dbo].[customer].[c_last_name] AS [Expr0],
[tpcds10].[dbo].[customer].[c_first_name] AS [Expr1],
[tpcds10].[dbo].[date_dim].[d_date] AS [Expr2],
[tpcds10].[dbo].[date_dim].[d_month_seq] AS [Expr3]
FROM [dbo].[store_sales],
[dbo].[date_dim],
[dbo].[customer]
WHERE ([tpcds10].[dbo].[store_sales].[ss_customer_sk]=[tpcds10].[dbo].[customer].[c_customer_sk])
AND ([tpcds10].[dbo].[store_sales].[ss_sold_date_sk]=[tpcds10].[dbo].[date_dim].[d_date_sk])
GROUP BY [tpcds10].[dbo].[customer].[c_last_name],
[tpcds10].[dbo].[customer].[c_first_name],
[tpcds10].[dbo].[date_dim].[d_date],
[tpcds10].[dbo].[date_dim].[d_month_seq]</materialized_view_candidates>
<materialized_view_candidates with_constants="False">CREATE MATERIALIZED VIEW View2 WITH (DISTRIBUTION = HASH([Expr0])) AS
SELECT [tpcds10].[dbo].[customer].[c_last_name] AS [Expr0],
[tpcds10].[dbo].[customer].[c_first_name] AS [Expr1],
[tpcds10].[dbo].[date_dim].[d_date] AS [Expr2],
[tpcds10].[dbo].[date_dim].[d_month_seq] AS [Expr3]
FROM [dbo].[catalog_sales],
[dbo].[date_dim],
[dbo].[customer]
WHERE ([tpcds10].[dbo].[catalog_sales].[cs_bill_customer_sk]=[tpcds10].[dbo].[customer].[c_customer_sk])
AND ([tpcds10].[dbo].[catalog_sales].[cs_sold_date_sk]=[tpcds10].[dbo].[date_dim].[d_date_sk])
GROUP BY [tpcds10].[dbo].[customer].[c_last_name],
[tpcds10].[dbo].[customer].[c_first_name],
[tpcds10].[dbo].[date_dim].[d_date],
[tpcds10].[dbo].[date_dim].[d_month_seq]</materialized_view_candidates>
<materialized_view_candidates with_constants="True">CREATE MATERIALIZED VIEW View3 WITH (DISTRIBUTION = HASH([Expr0])) AS
SELECT [tpcds10].[dbo].[customer].[c_last_name] AS [Expr0],
[tpcds10].[dbo].[customer].[c_first_name] AS [Expr1],
[tpcds10].[dbo].[date_dim].[d_date] AS [Expr2]
FROM [dbo].[store_sales],
[dbo].[date_dim],
[dbo].[customer]
WHERE ([tpcds10].[dbo].[store_sales].[ss_customer_sk]=[tpcds10].[dbo].[customer].[c_customer_sk])
AND ([tpcds10].[dbo].[store_sales].[ss_sold_date_sk]=[tpcds10].[dbo].[date_dim].[d_date_sk])
AND ([tpcds10].[dbo].[date_dim].[d_month_seq]>=(1194))
AND ([tpcds10].[dbo].[date_dim].[d_month_seq]<=(1205))
GROUP BY [tpcds10].[dbo].[customer].[c_last_name],
[tpcds10].[dbo].[customer].[c_first_name],
[tpcds10].[dbo].[date_dim].[d_date]</materialized_view_candidates>
<materialized_view_candidates with_constants="True">CREATE MATERIALIZED VIEW View4 WITH (DISTRIBUTION = HASH([Expr0])) AS
SELECT [tpcds10].[dbo].[customer].[c_last_name] AS [Expr0],
[tpcds10].[dbo].[customer].[c_first_name] AS [Expr1],
[tpcds10].[dbo].[date_dim].[d_date] AS [Expr2]
FROM [dbo].[catalog_sales],
[dbo].[date_dim],
[dbo].[customer]
WHERE ([tpcds10].[dbo].[catalog_sales].[cs_bill_customer_sk]=[tpcds10].[dbo].[customer].[c_customer_sk])
AND ([tpcds10].[dbo].[catalog_sales].[cs_sold_date_sk]=[tpcds10].[dbo].[date_dim].[d_date_sk])
AND ([tpcds10].[dbo].[date_dim].[d_month_seq]>=(1194))
AND ([tpcds10].[dbo].[date_dim].[d_month_seq]<=(1205))
GROUP BY [tpcds10].[dbo].[customer].[c_last_name],
[tpcds10].[dbo].[customer].[c_first_name],
[tpcds10].[dbo].[date_dim].[d_date]</materialized_view_candidates>
</materialized_view_candidates>
<dsql_operations total_cost="3472197.35650704" total_number_operations="28">
<dsql_operation operation_type="RND_ID">
<identifier>TEMP_ID_1</identifier>
</dsql_operation>
<dsql_operation operation_type="ON">
<location permanent="false" distribution="AllComputeNodes" />
<sql_operations>
<sql_operation type="statement">CREATE TABLE [tempdb].[dbo].[TEMP_ID_1] ([c_customer_sk] INT NOT NULL, [c_first_name] CHAR(20) COLLATE SQL_Latin1_General_CP1_CI_AS, [c_last_name] CHAR(30) COLLATE SQL_Latin1_General_CP1_CI_AS ) WITH(DATA_COMPRESSION=PAGE);</sql_operation>
</sql_operations>
</dsql_operation>
<dsql_operation operation_type="BROADCAST_MOVE">
<operation_cost cost="842400" accumulative_cost="842400" average_rowsize="54" output_rows="65000000" GroupNumber="44" />
<source_statement>SELECT [T1_1].[c_customer_sk] AS [c_customer_sk],
[T1_1].[c_first_name] AS [c_first_name],
[T1_1].[c_last_name] AS [c_last_name]
FROM [tpcds10].[dbo].[customer] AS T1_1</source_statement>
<destination_table>[TEMP_ID_1]</destination_table>
</dsql_operation>
<dsql_operation operation_type="RND_ID">
<identifier>TEMP_ID_2</identifier>
</dsql_operation>
<dsql_operation operation_type="ON">
<location permanent="false" distribution="AllComputeNodes" />
<sql_operations>
<sql_operation type="statement">CREATE TABLE [tempdb].[dbo].[TEMP_ID_2] ([d_date_sk] INT NOT NULL, [d_date] DATE ) WITH(DATA_COMPRESSION=PAGE);</sql_operation>
</sql_operations>
</dsql_operation>
<dsql_operation operation_type="BROADCAST_MOVE">
<operation_cost cost="0.62729352" accumulative_cost="842400.62729352" average_rowsize="7" output_rows="373.389" GroupNumber="43" />
<source_statement>SELECT [T1_1].[d_date_sk] AS [d_date_sk],
[T1_1].[d_date] AS [d_date]
FROM (SELECT [T2_1].[d_date_sk] AS [d_date_sk],
[T2_1].[d_date] AS [d_date]
FROM [tpcds10].[dbo].[date_dim] AS T2_1
WHERE (([T2_1].[d_month_seq] >= CAST ((1194) AS INT))
AND ([T2_1].[d_month_seq] <= CAST ((1205) AS INT)))) AS T1_1</source_statement>
<destination_table>[TEMP_ID_2]</destination_table>
</dsql_operation>
<dsql_operation operation_type="RND_ID">
<identifier>TEMP_ID_3</identifier>
</dsql_operation>
<dsql_operation operation_type="ON">
<location permanent="false" distribution="AllDistributions" />
<sql_operations>
<sql_operation type="statement">CREATE TABLE [tempdb].[dbo].[TEMP_ID_3] ([cs_bill_customer_sk] INT, [d_date] DATE ) WITH(DATA_COMPRESSION=PAGE);</sql_operation>
</sql_operations>
</dsql_operation>
<dsql_operation operation_type="SHUFFLE_MOVE">
<operation_cost cost="610362.9" accumulative_cost="1452763.52729352" average_rowsize="7" output_rows="2906490000" GroupNumber="57" />
<source_statement>SELECT [T1_1].[cs_bill_customer_sk] AS [cs_bill_customer_sk],
[T1_1].[d_date] AS [d_date]
FROM (SELECT [T2_2].[cs_bill_customer_sk] AS [cs_bill_customer_sk],
[T2_1].[d_date] AS [d_date]
FROM [tempdb].[dbo].[TEMP_ID_2] AS T2_1
INNER JOIN
[tpcds10].[dbo].[catalog_sales] AS T2_2
ON ([T2_2].[cs_sold_date_sk] = [T2_1].[d_date_sk])) AS T1_1</source_statement>
<destination_table>[TEMP_ID_3]</destination_table>
<shuffle_columns>d_date;</shuffle_columns>
</dsql_operation>
<dsql_operation operation_type="ON">
<location permanent="false" distribution="AllComputeNodes" />
<sql_operations>
<sql_operation type="statement">DROP TABLE [tempdb].[dbo].[TEMP_ID_2]</sql_operation>
</sql_operations>
</dsql_operation>
<dsql_operation operation_type="RND_ID">
<identifier>TEMP_ID_4</identifier>
</dsql_operation>
<dsql_operation operation_type="ON">
<location permanent="false" distribution="AllComputeNodes" />
<sql_operations>
<sql_operation type="statement">CREATE TABLE [tempdb].[dbo].[TEMP_ID_4] ([c_customer_sk] INT NOT NULL, [c_first_name] CHAR(20) COLLATE SQL_Latin1_General_CP1_CI_AS, [c_last_name] CHAR(30) COLLATE SQL_Latin1_General_CP1_CI_AS ) WITH(DATA_COMPRESSION=PAGE);</sql_operation>
</sql_operations>
</dsql_operation>
<dsql_operation operation_type="BROADCAST_MOVE">
<operation_cost cost="842400" accumulative_cost="2295163.52729352" average_rowsize="54" output_rows="65000000" GroupNumber="36" />
<source_statement>SELECT [T1_1].[c_customer_sk] AS [c_customer_sk],
[T1_1].[c_first_name] AS [c_first_name],
[T1_1].[c_last_name] AS [c_last_name]
FROM [tpcds10].[dbo].[customer] AS T1_1</source_statement>
<destination_table>[TEMP_ID_4]</destination_table>
</dsql_operation>
<dsql_operation operation_type="RND_ID">
<identifier>TEMP_ID_5</identifier>
</dsql_operation>
<dsql_operation operation_type="ON">
<location permanent="false" distribution="AllComputeNodes" />
<sql_operations>
<sql_operation type="statement">CREATE TABLE [tempdb].[dbo].[TEMP_ID_5] ([d_date_sk] INT NOT NULL, [d_date] DATE ) WITH(DATA_COMPRESSION=PAGE);</sql_operation>
</sql_operations>
</dsql_operation>
<dsql_operation operation_type="BROADCAST_MOVE">
<operation_cost cost="0.62729352" accumulative_cost="2295164.15458704" average_rowsize="7" output_rows="373.389" GroupNumber="35" />
<source_statement>SELECT [T1_1].[d_date_sk] AS [d_date_sk],
[T1_1].[d_date] AS [d_date]
FROM (SELECT [T2_1].[d_date_sk] AS [d_date_sk],
[T2_1].[d_date] AS [d_date]
FROM [tpcds10].[dbo].[date_dim] AS T2_1
WHERE (([T2_1].[d_month_seq] >= CAST ((1194) AS INT))
AND ([T2_1].[d_month_seq] <= CAST ((1205) AS INT)))) AS T1_1</source_statement>
<destination_table>[TEMP_ID_5]</destination_table>
</dsql_operation>
<dsql_operation operation_type="RND_ID">
<identifier>TEMP_ID_6</identifier>
</dsql_operation>
<dsql_operation operation_type="ON">
<location permanent="false" distribution="AllDistributions" />
<sql_operations>
<sql_operation type="statement">CREATE TABLE [tempdb].[dbo].[TEMP_ID_6] ([ss_customer_sk] INT, [d_date] DATE ) WITH(DATA_COMPRESSION=PAGE);</sql_operation>
</sql_operations>
</dsql_operation>
<dsql_operation operation_type="SHUFFLE_MOVE">
<operation_cost cost="1177033.2" accumulative_cost="3472197.35458704" average_rowsize="7" output_rows="5604920000" GroupNumber="54" />
<source_statement>SELECT [T1_1].[ss_customer_sk] AS [ss_customer_sk],
[T1_1].[d_date] AS [d_date]
FROM (SELECT [T2_2].[ss_customer_sk] AS [ss_customer_sk],
[T2_1].[d_date] AS [d_date]
FROM [tempdb].[dbo].[TEMP_ID_5] AS T2_1
INNER JOIN
[tpcds10].[dbo].[store_sales] AS T2_2
ON ([T2_2].[ss_sold_date_sk] = [T2_1].[d_date_sk])) AS T1_1</source_statement>
<destination_table>[TEMP_ID_6]</destination_table>
<shuffle_columns>d_date;</shuffle_columns>
</dsql_operation>
<dsql_operation operation_type="ON">
<location permanent="false" distribution="AllComputeNodes" />
<sql_operations>
<sql_operation type="statement">DROP TABLE [tempdb].[dbo].[TEMP_ID_5]</sql_operation>
</sql_operations>
</dsql_operation>
<dsql_operation operation_type="ON">
<location permanent="false" distribution="Control" />
<sql_operations>
<sql_operation type="statement">CREATE TABLE [tempdb].[QTables].[QTable_87367172aa554f06b73cf3ed97e5b985] ([col] BIGINT ) WITH(DATA_COMPRESSION=PAGE);</sql_operation>
</sql_operations>
</dsql_operation>
<dsql_operation operation_type="PARTITION_MOVE">
<operation_cost cost="0.00192" accumulative_cost="3472197.35650704" average_rowsize="8" output_rows="1" GroupNumber="66" />
<location distribution="AllDistributions" />
<source_statement>SELECT [T1_1].[col] AS [col]
FROM (SELECT COUNT_BIG(CAST ((0) AS INT)) AS [col]
FROM (SELECT 0 AS [col]
FROM [tempdb].[dbo].[TEMP_ID_4] AS T3_1
INNER JOIN
[tempdb].[dbo].[TEMP_ID_6] AS T3_2
ON ([T3_2].[ss_customer_sk] = [T3_1].[c_customer_sk])
GROUP BY [T3_1].[c_last_name], [T3_1].[c_first_name], [T3_2].[d_date]
HAVING NOT EXISTS (SELECT 1 AS C1
FROM [tempdb].[dbo].[TEMP_ID_1] AS T4_1
INNER JOIN
[tempdb].[dbo].[TEMP_ID_3] AS T4_2
ON ([T4_2].[cs_bill_customer_sk] = [T4_1].[c_customer_sk])
GROUP BY [T4_1].[c_last_name], [T4_1].[c_first_name], [T4_2].[d_date]
HAVING (([T3_1].[c_last_name] = [T4_1].[c_last_name]
OR ([T3_1].[c_last_name] IS NULL
AND [T4_1].[c_last_name] IS NULL))
AND ([T3_1].[c_first_name] = [T4_1].[c_first_name]
OR ([T3_1].[c_first_name] IS NULL
AND [T4_1].[c_first_name] IS NULL))
AND ([T3_2].[d_date] = [T4_2].[d_date]
OR ([T3_2].[d_date] IS NULL
AND [T4_2].[d_date] IS NULL))))) AS T2_1
GROUP BY [T2_1].[col]) AS T1_1</source_statement>
<destination>Control</destination>
<destination_table>[QTable_87367172aa554f06b73cf3ed97e5b985]</destination_table>
</dsql_operation>
<dsql_operation operation_type="ON">
<location permanent="false" distribution="AllDistributions" />
<sql_operations>
<sql_operation type="statement">DROP TABLE [tempdb].[dbo].[TEMP_ID_6]</sql_operation>
</sql_operations>
</dsql_operation>
<dsql_operation operation_type="ON">
<location permanent="false" distribution="AllComputeNodes" />
<sql_operations>
<sql_operation type="statement">DROP TABLE [tempdb].[dbo].[TEMP_ID_4]</sql_operation>
</sql_operations>
</dsql_operation>
<dsql_operation operation_type="ON">
<location permanent="false" distribution="AllDistributions" />
<sql_operations>
<sql_operation type="statement">DROP TABLE [tempdb].[dbo].[TEMP_ID_3]</sql_operation>
</sql_operations>
</dsql_operation>
<dsql_operation operation_type="ON">
<location permanent="false" distribution="AllComputeNodes" />
<sql_operations>
<sql_operation type="statement">DROP TABLE [tempdb].[dbo].[TEMP_ID_1]</sql_operation>
</sql_operations>
</dsql_operation>
<dsql_operation operation_type="RETURN">
<location distribution="Control" />
<select>SELECT [T1_1].[col] AS [col]
FROM (SELECT CONVERT (INT, [T2_1].[col], 0) AS [col]
FROM (SELECT ISNULL([T3_1].[col], CONVERT (BIGINT, 0, 0)) AS [col]
FROM (SELECT SUM([T4_1].[col]) AS [col]
FROM [tempdb].[QTables].[QTable_87367172aa554f06b73cf3ed97e5b985] AS T4_1) AS T3_1) AS T2_1) AS T1_1</select>
</dsql_operation>
<dsql_operation operation_type="ON">
<location permanent="false" distribution="Control" />
<sql_operations>
<sql_operation type="statement">DROP TABLE [tempdb].[QTables].[QTable_87367172aa554f06b73cf3ed97e5b985]</sql_operation>
</sql_operations>
</dsql_operation>
</dsql_operations>
</dsql_query>
Vedi anche
- sys.pdw_materialized_view_column_distribution_properties (Transact-SQL)
- sys.pdw_materialized_view_distribution_properties (Transact-SQL)
- sys.pdw_materialized_view_mappings (Transact-SQL)
- Viste del catalogo di Azure Synapse Analytics e Parallel Data Warehouse
- Viste di sistema supportate in Azure Synapse Analytics
- Istruzioni T-SQL supportate in Azure Synapse Analytics
Passaggi successivi
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