我在一个awr报告中发现执行了很多次这个sql，这是在干啥呢？

SELECT /*+ RESULT_CACHE (SYSOBJ=TRUE SHELFLIFE=30) */ SNAP_ID, DBID, INSTANCE_NUMBER, SQL_ID, PARSING_SCHEMA_NAME, END_OF_FETCH_COUNT_DELTA, EXECUTIONS_DELTA, PX_SERVERS_EXECS_DELTA, BUFFER_GETS_DELTA, CPU_TIME_DELTA, ELAPSED_TIME_DELTA, FLAG, CON_ID FROM "SYS"."INT$DBA_HIST_SQLSTAT" "INT$DBA_HIST_SQLSTAT" WHERE ("INT$DBA_HIST_SQLSTAT"."SQL_ID"=:1 AND "INT$DBA_HIST_SQLSTAT"."PARSING_SCHEMA_NAME"=:2 AND ("INT$DBA_HIST_SQLSTAT"."CON_ID"=0 OR "INT$DBA_HIST_SQLSTAT"."CON_ID"=3) AND BITAND(NVL("INT$DBA_HIST_SQLSTAT"."FLAG", 0), 1)=0) AND ("INT$DBA_HIST_SQLSTAT".CON_ID=0 OR "INT$DBA_HIST_SQLSTAT".CON_ID=3)

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