DB2 programming skills (1)

The db2 tutorial is: DB2 programming skills (1 ). 1 DB2 Programming
1.1 do not use the TAB key 3 after creating a stored procedure
1.2 use temporary table 3
1.3 fetch the specified first few records from the data table 3
1.4 Use of cursor 4
Note: commit and rollback 4
Two ways to define a cursor 4
Method 5 for modifying the current record of the cursor
1.5 DECODE-like transcoding operation 5
1.6 locate the position of a character in a string similar to CHARINDEX 5
1.7 calculate the number of different days for two dates, similar to DATEDIF: 5
1.8 UDF writing Example 5
1.9 create table 6 with the IDENTITY value (automatically generated ID)
1.10 prevent handling of null fields 6
1.11 retrieve the number of processed records 6
1.12 usage of returning a result set (cursor) from a stored procedure 6
1.13 type conversion function 8
1.14 mutual calling of stored procedures 8
1.15 C stored procedure parameters Note 8
1.16 Stored Procedure FENCE and UNFENCE 8
1.17 SP error handling usage 9
1.18 IMPORT usage 9
1.19 use of VALUES 9
1.20 specify the isolation level 10 for the SELECT statement
1.21 differences between ATOMIC and not atomic 10
2 DB2 programming performance note 10
2.1 big data import table 10
2.2 try to write complex SQL statements 10
2.3 SQL SP and C SP selection 10
2.4 query optimization (HASH and RR_TO_RS) 11
2.5 avoid using COUNT (*) and EXISTS methods 11
3 DB2 table and SP management 12
3.1 view Stored Procedure text 12
3.2 View table structure 12
3.3 view the impact of each table on the SP (which SP is used) 12
3.4 check which table 12 is used by SP
3.5 check which SP uses the FUNCTION 12
3.6 modify table structure 12
4 DB2 System Management 13
4.1 DB2 installation 13
4.2 create database 14
4.3 manual remote database (alias) configuration 14
4.4 stop starting a database instance 14
4.5 connect to the database and view the currently connected database 14
4.6 stop starting database HEAD 15
4.7 view and stop the current database application 15
4.8 check which databases under this INSTANCE 15
4.9 view and change the database HEAD configuration 16
4.9.1 change the size of the sorting heap to 16
4.9.2 modify the transaction log size 16
4.9.3 modify the program heap memory size when the program heap memory is insufficient 16
4.10 viewing and changing database instance configurations 16
4.10.1 enable monitoring of lock conditions. 16
4.10.2 change diagnostic error capture Level 17
4.11 DB2 environment variable 17
4.12 DB2 command environment settings 17
4.13 change isolation level 17
4.14 manage DB \ INSTANCE parameters 18
4.15 remove version problems after upgrade 18
4.16 view database table deadlocks 18


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