support/notes
1
0
Fork 0
Code Issues Pull Requests Actions Packages Projects Releases Wiki Activity

2026-05-01 14:48:00

Browse Source
This commit is contained in:
Valeriu PLESNILA
2026-05-01 16:48:01 +02:00
parent 71b8ec9123
commit 88ed18c14d
2 changed files with 206 additions and 0 deletions
Download Patch File Download Diff File Expand all files Collapse all files
divers/bulk_operations.md
+155
View File
@@ -0,0 +1,155 @@
> https://medium.com/@ramazan.ozdemir/bulk-operations-in-oracle-database-bulk-insert-bulk-update-and-bulk-delete-0a1b9074cb0e
Setup:
```sql
create user if not exists SAMPLE no authentication;
grant connect, resource, unlimited tablespace to SAMPLE;
drop table if exists SAMPLE.RANDOM_DATA_LOAD purge;
create table SAMPLE.RANDOM_DATA_LOAD (
id_col NUMBER,
text_col VARCHAR2(30),
date_col DATE
);
SET SERVEROUTPUT ON;
DECLARE
-- Parameters
v_total_rows NUMBER := 10000000; -- Total lines to insert
v_start_date DATE := DATE '2020-01-01'; -- Range start
v_end_date DATE := DATE '2025-12-31'; -- Range end
-- Internal variables
v_date_range NUMBER;
BEGIN
v_date_range := v_end_date - v_start_date;
FOR i IN 1 .. v_total_rows LOOP
INSERT INTO SAMPLE.RANDOM_DATA_LOAD (
id_col,
text_col,
date_col
) VALUES (
i, -- Distinct integer
DBMS_RANDOM.STRING('A', 30), -- Random string (Alphanumeric)
v_start_date + DBMS_RANDOM.VALUE(0, v_date_range) -- Random date in range
);
-- Optional: Commit every 10,000 rows to keep undo logs manageable
IF MOD(i, 10000) = 0 THEN
COMMIT;
END IF;
END LOOP;
COMMIT;
DBMS_OUTPUT.PUT_LINE('Successfully inserted ' || v_total_rows || ' rows.');
END;
/
alter table SAMPLE.RANDOM_DATA_LOAD
add constraint RANDOM_DATA_LOAD_PK PRIMARY KEY (id_col);
exec dbms_stats.gather_table_stats(ownname=>'SAMPLE',tabname=>'RANDOM_DATA_LOAD',method_opt=>'for all columns size AUTO');
```
Bulk delete:
```sql
var my_action VARCHAR2(30);
exec :my_action:='bulk delete';
@login
select sysdate from dual;
exec DBMS_APPLICATION_INFO.SET_ACTION (action_name => :my_action);
DECLARE
TYPE id_col_table_type IS TABLE OF SAMPLE.RANDOM_DATA_LOAD.id_col%TYPE;
id_col_table id_col_table_type;
BEGIN
-- Retrieve data to be deleted in bulk
SELECT id_col BULK COLLECT INTO id_col_table FROM SAMPLE.RANDOM_DATA_LOAD WHERE date_col <= date'2022-06-15';
-- Perform bulk delete
FORALL i IN 1..id_col_table.COUNT
DELETE FROM SAMPLE.RANDOM_DATA_LOAD WHERE id_col = id_col_table(i);
COMMIT;
END;
/
select sysdate from dual;
exec DBMS_APPLICATION_INFO.SET_ACTION (action_name => NULL);
```
Classic delete 1:
```sql
var my_action VARCHAR2(30);
exec :my_action:='classic delete 1';
@login
select sysdate from dual;
exec DBMS_APPLICATION_INFO.SET_ACTION (action_name => :my_action);
delete from SAMPLE.RANDOM_DATA_LOAD where id_col in (select id_col from SAMPLE.RANDOM_DATA_LOAD WHERE date_col <= date'2022-06-15');
select sysdate from dual;
exec DBMS_APPLICATION_INFO.SET_ACTION (action_name => NULL);
```
Classic delete 2:
```sql
var my_action VARCHAR2(30);
exec :my_action:='classic delete 2';
@login
select sysdate from dual;
exec DBMS_APPLICATION_INFO.SET_ACTION (action_name => :my_action);
delete from SAMPLE.RANDOM_DATA_LOAD where date_col <= date'2022-06-15';
select sysdate from dual;
exec DBMS_APPLICATION_INFO.SET_ACTION (action_name => NULL);
```
```
bulk delete
-----------
DELETE FROM SAMPLE.RANDOM_DATA_LOAD WHERE ID_COL = :B1
Elapsed CPU IO
End Plan Buffer time time time
Snap snaphot hash 0ptimizer Buffer gets SQL Disk /exec /exec /exec Elig Inter
Instance Id time value cost #Ex #EOF gets /exec Prof Px reads (sec) (sec) (sec) Mb Mb #Rows
-------- -------- ----------- ---------- ---------- -------- -------- ---------- ----------- ---- ------ ---------- ------- ----- ------ ------- ------- ----------
NABOOPRD 3 01/05 15:49 2400881684 2 1 1 20971850 20971850 0 83 170 103 0 0 1 4089976
classic delete 1
---------------- Elapsed CPU IO
End Plan Buffer time time time
Snap snaphot hash 0ptimizer Buffer gets SQL Disk /exec /exec /exec Elig Inter
Instance Id time value cost #Ex #EOF gets /exec Prof Px reads (sec) (sec) (sec) Mb Mb #Rows
-------- -------- ----------- ---------- ---------- -------- -------- ---------- ----------- ---- ------ ---------- ------- ----- ------ ------- ------- ----------
NABOOPRD 4 01/05 16:03 1336456799 18858 1 1 12570950 12570950 0 22165 93 52 0 0 173 4089976
classic delete 2
---------------- Elapsed CPU IO
End Plan Buffer time time time
Snap snaphot hash 0ptimizer Buffer gets SQL Disk /exec /exec /exec Elig Inter
Instance Id time value cost #Ex #EOF gets /exec Prof Px reads (sec) (sec) (sec) Mb Mb #Rows
-------- -------- ----------- ---------- ---------- -------- -------- ---------- ----------- ---- ------ ---------- ------- ----- ------ ------- ------- ----------
NABOOPRD 5 01/05 16:18 1336456799 18858 1 1 12562664 12562664 0 25260 91 51 0 0 197 4089976
```
divers/purge_all_AWR_snap.md
+51
View File
@@ -0,0 +1,51 @@
## Purge all AWR snapshots
> To run from `CDB$ROOT` and not inside a **PDB**.
```sql
DECLARE
v_lo_snap_id NUMBER;
v_hi_snap_id NUMBER;
v_awr_dbid NUMBER;
BEGIN
-- 1. Get the DBID that actually exists in the AWR repository
SELECT DISTINCT dbid INTO v_awr_dbid FROM dba_hist_snapshot WHERE ROWNUM = 1;
-- 2. Find the min and max snapshot IDs for that specific DBID
SELECT min(snap_id), max(snap_id)
INTO v_lo_snap_id, v_hi_snap_id
FROM dba_hist_snapshot
WHERE dbid = v_awr_dbid;
IF v_lo_snap_id IS NOT NULL THEN
DBMS_OUTPUT.PUT_LINE('Deleting snapshots for DBID ' || v_awr_dbid ||
' from ' || v_lo_snap_id || ' to ' || v_hi_snap_id);
DBMS_WORKLOAD_REPOSITORY.DROP_SNAPSHOT_RANGE(
low_snap_id => v_lo_snap_id,
high_snap_id => v_hi_snap_id,
dbid => v_awr_dbid
);
DBMS_OUTPUT.PUT_LINE('AWR Snapshots cleared.');
ELSE
DBMS_OUTPUT.PUT_LINE('No snapshots found in dba_hist_snapshot.');
END IF;
EXCEPTION
WHEN TOO_MANY_ROWS THEN
DBMS_OUTPUT.PUT_LINE('Error: Multiple DBIDs found in AWR. Please specify one manually.');
WHEN NO_DATA_FOUND THEN
DBMS_OUTPUT.PUT_LINE('Error: No snapshot data exists to delete.');
END;
/
```
Verify:
```sql
select min(snap_id),max(snap_id), dbid from dba_hist_snapshot group by dbid;
```
To take a snapshot:
```sql
execute dbms_workload_repository.CREATE_SNAPSHOT;
```