Thread: Alter table command is pretty slow
Hi, I have installed the PostgreSQL native Windows (8.0 using the Windows MSI installer) on a Windows 2K box. I accepted all of the installation defaults. It is running successfully and my application that stores data via Hibernate 2.0 is working. But it is taking too long [>15 mimutes] if I try to execute any DDL commands . I Issued vacuum command just before running a DDL. My computer has 512 MB of RAM. Why is it so slow? Any help would be great. Thanks in advance
sreenivas@gmail.com (Sreenivas K) writes: > I have installed the PostgreSQL native Windows (8.0 using the Windows > MSI installer) on a Windows 2K box. I accepted all of the > installation defaults. It is running successfully and my application > that stores data via Hibernate 2.0 is working. But it is taking too > long [>15 mimutes] if I try to execute any DDL commands . I Issued > vacuum command just before running a DDL. My computer has 512 MB of > RAM. Why is it so slow? > > Any help would be great. You might want to look at pg_stat_activity (assuming activity logging is turned on) as well as pg_locks. DDL commands require exclusive locks on the tables that they are modifying, and *anything* else that may be touching the tables will block the DDL commands. VACUUM will definitely block DDL... At any rate, pg_stat_activity can tell you what queries are busy in the system. And pg_locks will tell you what relations are in what states. (You'll need to join pg_locks against pg_class in order to get relation names.) -- (format nil "~S@~S" "cbbrowne" "acm.org") http://www.ntlug.org/~cbbrowne/sap.html Rules of the Evil Overlord #78. "I will not tell my Legions of Terror "And he must be taken alive!" The command will be: ``And try to take him alive if it is reasonably practical.''" <http://www.eviloverlord.com/>