db2-luw

问题 select * from Schem.Customer where cust='20' and cust_id >= '890127' and rownum between 1 and 2 order by cust, cust_id; Execution time appr 2 min 10 sec select * from Schem.Customer where cust='20' and cust_id >= '890127' order by cust, cust_id fetch first 2 rows only ; Execution time appr 00.069 ms The execution time is a huge difference but results are the same. My team is not adopting to later one. Don't ask why. So what is the difference between Rownum and fetch first 2 rows and what

问题 select * from Schem.Customer where cust='20' and cust_id >= '890127' and rownum between 1 and 2 order by cust, cust_id; Execution time appr 2 min 10 sec select * from Schem.Customer where cust='20' and cust_id >= '890127' order by cust, cust_id fetch first 2 rows only ; Execution time appr 00.069 ms The execution time is a huge difference but results are the same. My team is not adopting to later one. Don't ask why. So what is the difference between Rownum and fetch first 2 rows and what

问题 I'm trying to use merge into to insert only new records. I would like to collect the IDs for new records that got inserted and also the IDs for duplicate records that get ignored. Here's the create statement for the table: drop table SSZ_ME_MIS.test_update_table; create table ssz_me_mis.test_update_table ( ID_col int not null generated always as identity, -- Primary Key val_col_1 int not null, val_col_2 varchar(255) not null, constraint pk_test_update_table primary key (ID_col), constraint uq

问题 When I use powershell tee-object cmdlet to save the output to a file, blank lines are created between each actual line. Output gets doubled and ugly, in both screen output, as well in the redirected file. regular command, and output: # db2 connect to sample Database Connection Information Database server = DB2/NT64 11.5.0.0 SQL authorization ID = SAMUEL Local database alias = SAMPLE but, when you use Tee-Object against it... here is what happens: # db2 connect to sample | Tee-Object test.out

问题 I have a case statement in Cognos report studio in which if the date is 1st of the current month of previous year then it should fetch data for last whole month (1 to the last date) data of the previous year. I think it is a syntax error. Below is the code that I'm sharing.Thanks in advance! Please let me know in case of concerns. case when [Corporate Calendar_BL].[Receive Date Details].[Receive Date - RD] = _first_of_month(_add_years(current_date,-1)) then [Corporate Calendar_BL].[Receive

问题 I would like to know the quantity of logs used (active logs) by each connection in the database. I know how to retrieve the quantity of active logs for the database, but not for each application. Knowing the quantity of active logs in the database helps me to identify if a log-full condition is approaching. However, I want to know which application is approaching to this condition of log-full. For this reason, I need to know how much log is used by each transaction (each application), but I

问题 I would like to know the quantity of logs used (active logs) by each connection in the database. I know how to retrieve the quantity of active logs for the database, but not for each application. Knowing the quantity of active logs in the database helps me to identify if a log-full condition is approaching. However, I want to know which application is approaching to this condition of log-full. For this reason, I need to know how much log is used by each transaction (each application), but I

问题 I would like to know the quantity of logs used (active logs) by each connection in the database. I know how to retrieve the quantity of active logs for the database, but not for each application. Knowing the quantity of active logs in the database helps me to identify if a log-full condition is approaching. However, I want to know which application is approaching to this condition of log-full. For this reason, I need to know how much log is used by each transaction (each application), but I

问题 DB2 version is 9.7.0.7 I have a flat file, and need to validate fully prior to insert into a production table. For analysis, I've parsed it into a table where all columns are VARCHAR . One of the tasks is to validate dates. I need to be able to locate the specific invalid dates, to report on the scope (frequency) and solution (reason). I use ISDATE() in Sybase and SQL Server, which returns a 1 for a valid date, and a 0 for an invalid date. In Teradata, I left join to the SYS_CALENDAR table in

问题 As my understanding, LockAcquisitionException will happen when a thread is trying to update a row of record that is locking by another thread. ( Please do correct me if I am wrong ) So I try to simulate as follow: I lock a row of record using dbVisualizer , then I using application to run a update query on the same record as well. At the end, I am just hitting global transaction time out instead of LockAcquisitionException with reason code 68. Thus, I am thinking that my understanding is