ISQL-SE 4.10.DD6(DOS 6.22):SE: '使用bcheck -y' 異常
我的應用程序有以下SQL腳本(代碼複查),其中我的用戶EXEC在工作日結束時REORG交易表:
DATABASE dbfiles;
UNLOAD TO "U:\UNL\ACTIVES.UNL"
SELECT * FROM transaction
WHERE trx_type IN ("E","I","C","P")
ORDER BY trx_cust_fullname,
trx_last_pymt;
UNLOAD TO "U:\UNL\INACTIVES.UNL"
SELECT * FROM transaction
WHERE trx_type IN ("F","R","T","X","V")
ORDER BY trx_cust_fullname,
trx_last_pymt DESC;
DROP TABLE transaction;
CREATE TABLE transaction
(
trx_store CHAR(2),
trx_cust_fullname CHAR(30),
trx_type CHAR(1),
trx_num SERIAL,
[...]
);
LOAD FROM "U:\UNL\ACTIVES.UNL" INSERT INTO transaction;
LOAD FROM "U:\UNL\INACTIVES.UNL" INSERT INTO transaction;
CREATE CLUSTER INDEX custn_idx ON transaction (trx_cust_fullname);
CREATE UNIQUE INDEX trxn_idx ON transaction (trx_num);
[3 more indexes...]
UPDATE STATISTICS FOR transaction;
運行此腳本後:TRANS103.DAT大小爲882832個字節,但 TRANS103.IDX規模僅爲22089字節!
雖然這個IDX文件大小對我來說看起來不太好,但我用「執行」屏幕查詢了事務表中的所有行,所有1083行都是可顯示的,更新了一些,添加了其他行並刪除了一些沒有問題的行,退出,又回去了,沒有遇到任何問題!然後我跑了「使用bcheck -y TRANS103」無論如何,得到了以下結果:
S:\DBFILES.DBS> bcheck –y TRANS103
BCHECK C-ISAM B-tree Checker version 4.10.DD6
C-ISAM File: s:\dbfiles.dbs\trans103
Checking dictionary and file sizes.
Index file node size = 512
Current C-ISAM index file node size = 512
Checking data file records.
Checking indexes and key descriptions.
Index 1 = unique key
0 index node(s) used -- 1 index b-tree level(s) used
Index 2 = duplicates (2,30,0)
42 index node(s) used -- 3 index b-tree level(s) used
Index 3 = unique key (32,5,0)
29 index node(s) used -- 2 index b-tree level(s) used
Index 4 = duplicates (242,4,2)
37 index node(s) used -- 2 index b-tree level(s) used
Index 5 = duplicates (241,1,0)
36 index node(s) used -- 2 index b-tree level(s) used
Index 6 = duplicates (46,4,2)
38 index node(s) used -- 2 index b-tree level(s) used
Checking data record and index node free lists.
ERROR: 177 missing index node pointer(s)
Fix index node free list ? yes
Recreating index node free list.
Recreating index 6.
Recreating index 5.
Recreating index 4.
Recreating index 3.
Recreating index 2.
Recreating index 1.
184 index node(s) used, 177 free -- 1083 data record(s) used, 0 free
所以B檢查後,現在其大小.IDX增加至122561個字節,這聽起來是正確的大小,所以我又回到了「執行「,重複以前的測試,沒有遇到任何問題。出於好奇,我再次運行了bcheck,它重複了我運行的第一個bcheck的相同結果!就像第一個bcheck從未修復過表一樣!任何人都知道爲什麼bcheck再次修復了應該已經是「修復「?它可能與羣集索引有關嗎?