Questions:
Does their is an ISOLATION level in DB2 at database level ?
What is the default ISOLATION LEVEL in DB2 at database level Database ?
How can we change the ISOLATION LEVEL in DB2 at database level ?
There is not really a reliable way to guarantee the isolation level when an application connects to the database; the client application should set the desired isolation level.
As an example when I first connect toa DB2 database on Linux or AIX the isolation is NULL.
db2 -x "values(current isolation)"
Related
I could not find any way to limit replication slot in Cloud SQL postgres flags (max_slot_wal_keep_size) ? Is there any way I can limit it ?
I’m trying to perform a Diff on two DB2 schema’s and when I try to select my source and destination connections it doesn’t list my NEW connection. I’m using latest version. I can connect to DB2 manually and query as well, but just can’t sect that connection during database Diff.
Where are the connections saved in sql
Developer?
That feature is reserved for Oracle Database connections.
DB2 connectivity is provided for migrations to Oracle only.
We have limited support for DB2 in the Data Modeler (which is part of SQL Developer), and you can compare models, but the generation of DDL synch scripts is reserved for Oracle data models only.
By default, PostgreSQL JDBC reads all records into momery and then starts to process them.
If it is MySQL JDBC and MySQL database, I know how to do the reading and processing simultaneously. However, I don't know how to do it in PostgreSQL JDBC and PostgreSQL database.
Is there any tools for replication in postgres which can doing the following :
automatic DDL replication?
when master DB down, then slave will become the master DB immediately.
my company database is +- 5GB size
i have search some tools for replication which is slony and bucardo (and all trigger based replication system cannot doing the DDL replication)(source). and for 9.0 Streaming Replication (built in on postgres),Gabriel Weinberg (DuckDuckGo)said "Steve Signer wrote up some cases where you wouldn't want to/be able to use the built-in replication"
so 3 tools i found (slony,bucardo and 9.0 SR) , doesnt meet my criteria to do the postgres. is there any suggestion?
thanks
automatic DDL replication?
=> Use streaming replication, replicates everything.
when master DB down, then slave will become the master DB immediately.
=> pgPool does it's job over here, works fine.
my company database is +- 5GB size
=> That's very small, don't worry.
You can use debezium for replication transactions (insert, delete and update)... for ddl you can use kafka connect ;)
Suppose I have multiple Oracle databases in the same server. Now I want to connect to particular database and query a table just like SQL Server 2008. How to start particular Oracle database?
If you are using SQL*Plus, the most common syntax for opening a connection is
sqlplus user_name/password#tns_alias
In this example TNS_ALIAS is the TNS alias for the particular database you want to connect to (most likely "XE" based on your followups to inium's answer). If you want to connect to a different database, you would need to specify a TNS alias for that specific database.
Note that since you are coming from a SQL Server background, the SQL Server definition of a database is rather different than the Oracle definition. What SQL Server calls a database is similar logically to what Oracle calls a schema (and similar physically to what Oracle calls a tablespace). So when you're dealing with Oracle, it's much more common to have many schemas in a single database than to have a large number of databases on a server. This is particularly true if you're using the Express Edition (Oracle XE) where you're generally limited to one database per machine.
go to cmd and type sqlplus <database-name>/<database-password>
You can use SQL Developer, it's similar to SQL Enterprise Manager 2005. Just create a new connection using the db user name and password.