Morning listers!
I am having performance problems with this database, transactions ar running
very slow and I am not sure if I have choose the right optimizer mode...
AIX 4.2.1, Oracle 7.3.4, 30 GB Database, 1 GB Real Memory,
500 MB SGA, 70 concurrent users, mostly OLTP transactions.
I have tunned init parameters the best I can we the resources I have:
db_files = 70
db_writers = 4
db_file_multiblock_read_count = 16
db_block_buffers = 57600
db_block_size = 8192
shared_pool_size = 157286400
processes = 200
dml_locks = 1500
log_buffer = 655360
sequence_cache_entries = 800
sequence_cache_hash_buckets = 89
log_checkpoint_interval = 80000
optimizer_mode=CHOOSE
session_cached_cursors = 300
sort_area_size=1048576
hash_area_size=262144
hash_multiblock_io_count=4
hash_join_enabled=TRUE
always_anti_join=HASH
job_queue_processes=8
35 rollback segments, inital 1MB, next 1MB, optimal 30 MB
8 multiplexed redologs, 30 MB each
I tried FIRST_ROWS, analyzing the tables, but users claimed that performance
was getting worse, so I chaged it to Choose. Always analyzing the tables....
but, everytime I analyze the tables, performance gets worse.
Is this a normal behavior?
Any advice will be welcome!
thanks is advance,
Saludos,
Veronica Levin Enriquez
Administrador AIX
Compañía Cervecera de Nicaragua
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Author: Veronica Levin
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