This is how many blocks you processed in "consistent read" mode. This will include counts of blocks read from the rollback segment in order to roll back a block. This is the mode you read blocks in with a SELECT
loop inner join (cost=2.86 rows=4) (actual time=0.039,0.039,0.039..0.039,0.039,0.039 rows=0,0,0 loops=1,1,1) -> Nested loop inner join (cost=1.45 rows=1) (actual time=0.037,0.037,0.037..0.037,0.037,0.037 rows=0,0,0 loops=1,1,1) -> Parallel table scan on customer, with par...
The following example returns the query plan for the same query with verbose output: explain verboseselecteventid, eventname,event.venueid, venuenamefromevent, venuewhereevent.venueid = venue.venueid; QUERY PLAN ---{HASHJOIN:startup_cost2.52:total_cost58653620.93:plan_rows8712:plan_width43:best...
The following is a basic example of openCypher explain output. The query is a single-node lookup in the air routes dataset for a node with the airport code ATL that invokes explain using the details mode: ## sample query aws neptune-graph execute-query \ --region <region> \ --graph-...
The following code provides an example of a nested loop join. BEGIN; CREATE TABLE public.nestedloop_test_1 ( a integer not null, b integer not null ); CALL set_table_property('public.nestedloop_test_1', 'distribution_key', 'a'); CREATE TABLE public.nestedloop_test_2 ( c integer not...
This is how many blocks you processed in "consistent read" mode. This will include counts of blocks read from the rollback segment in order to roll back a block. This is the mode you read blocks in with a SELECT, for example. Also, when you do a searched UPDATE/DELETE, you read the...
<derivedN>:ID值n的行的派生表结果,派生表可能是从FROM子句中的一个子查询生成的(The row refers to the derived table result for the row with an id value of N. A derived table may result, for example, from a subquery in the FROM clause.)。 <subqueryN>:ID值n的行的物化子查询结果。 4....
Figure 18: Example plan output using NESTED LOOP Sort Merge joins – Sort merge joins are useful when the join condition between two tables is an in-equality condition such as, <, <=, >, or >=. Sort merge joins can perform better than nested loop joins for large data sets. The join...
Example 3: Detailed Execution Plan with VERBOSE For even more insights, you can include the VERBOSE keyword: Code: EXPLAINVERBOSEANALYZESELECT*FROMordersWHEREcustomer_id=123; Copy Explanation: With VERBOSE, the command provides additional details about the structure and flow of the execution plan, su...
Figure 7.7 A Visual Explain Example The next visual explain diagram shows the visual representation of a query that contains a hash join. Prior to MySQL Workbench 8.0.22, a hash join was represented by ablock nested loopdiamond for queries executed by MySQL 8.0.19 (or earlier). ...