Commit f2caba

2025-12-02 12:10:24 feagor: -/-
/dev/null .. oracle/awr и ash/AWR - Buffer Hit Ratio в разрезе снапшотов.md
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+ ## AWR - Buffer Hit Ratio в разрезе снапшотов
+
+ ```oraclesql
+ with t as (
+ SELECT s.BEGIN_INTERVAL_TIME start_dt,
+ trunc(
+ (1-((physical_reads)/(db_block_gets+consistent_gets)))*100
+ ,2) buffer_hit_ratio ,
+ physical_reads ph_r,lead(physical_reads) over (order by s.SNAP_ID) ph_r_next, lead(physical_reads) over (order by s.SNAP_ID) - physical_reads ph_r_delta,
+ db_block_gets gets, lead(db_block_gets) over (order by s.SNAP_ID) gets_next,lead(db_block_gets) over (order by s.SNAP_ID) - db_block_gets gets_delta,
+ consistent_gets c_gets, lead(consistent_gets) over (order by s.SNAP_ID) c_gets_next, lead(consistent_gets) over (order by s.SNAP_ID)- consistent_gets c_gets_delta
+ FROM dba_hist_buffer_pool_stat t
+ join dba_hist_snapshot s on s.SNAP_ID = t.SNAP_ID
+ where trunc(BEGIN_INTERVAL_TIME) >= to_date('25.03.2024','dd.mm.yyyy')
+ order by 1
+ )
+ SELECT t.start_dt,buffer_hit_ratio hit_g, trunc(
+ (1-((ph_r_delta)/(gets_delta+c_gets_delta)))*100
+ ,2) hit_l FROM t
+ ```
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