How Can I make this query run faster

Question

SQL> EXPLAIN PLAN FOR SELECT a.txid, a.methodid, a.serviceid, a.nodename, a.env, a.ts, a.te, a.resultcode, a.resultmessage FROM g2log.txmaster a,
2 g2log.txlookup b WHERE b.key = 'sbcgnfttxuniquedslamportid' AND b.value = 'MTC3LS733001-1-1-2-13' AND a.txid = b.txid ORDER BY ts desc;
Explained.
Elapsed: 00:00:00.01
SQL> @$ORACLE_HOME/rdbms/admin/utlxpls.sql
PLAN_TABLE_OUTPUT
Plan hash value: 3790334907
| Id | Operation | Name | Rows | Bytes | Cost (%CPU)| Time | Pstart| Pstop |
| 0 | SELECT STATEMENT | | 578 | 108K| 1267 (1)| 00:00:16 | | |
| 1 | PX COORDINATOR | | | | | | | |
| 2 | PX SEND QC (ORDER) | :TQ10001 | 578 | 108K| 1267 (1)| 00:00:16 | | |
| 3 | SORT ORDER BY | | 578 | 108K| 1267 (1)| 00:00:16 | | |
| 4 | PX RECEIVE | | | | | | | |
| 5 | PX SEND RANGE | :TQ10000 | | | | | | |
| 6 | NESTED LOOPS | | | | | | | |
| 7 | NESTED LOOPS | | 578 | 108K| 1266 (1)| 00:00:16 | | |
| 8 | PX PARTITION RANGE ALL | | 578 | 44506 | 109 (0)| 00:00:02 | 1 | 27 |
| 9 | TABLE ACCESS BY LOCAL INDEX ROWID| TXLOOKUP | 578 | 44506 | 109 (0)| 00:00:02 | 1 | 27 |
|* 10 | INDEX RANGE SCAN | TX_KEY_VAL | 578 | | 58 (0)| 00:00:01 | 1 | 27 |
|* 11 | INDEX UNIQUE SCAN | TXMASTER_TXID_PK | 1 | | 1 (0)| 00:00:01 | | |
| 12 | TABLE ACCESS BY GLOBAL INDEX ROWID | TXMASTER | 1 | 116 | 2 (0)| 00:00:01 | ROWID | ROWID |
Predicate Information (identified by operation id):
10 - access("B"."KEY"='sbcgnfttxuniquedslamportid' AND "B"."VALUE"='MTC3LS733001-1-1-2-13')
11 - access("A"."TXID"="B"."TXID")
25 rows selected.
I have gathered stats on the two tables as well
SQL> select count(*) from g2log.txmaster;
COUNT(*)
88812
SQL> select count(*) from g2log.txlookup;
COUNT(*)
228883

Answer 1

I bellieve that it is disabled as well:
SQL> show parameter parallel
NAME TYPE VALUE
fast_start_parallel_rollback string LOW
parallel_adaptive_multi_user boolean TRUE
parallel_automatic_tuning boolean FALSE
parallel_degree_limit string CPU
parallel_degree_policy string MANUAL
parallel_execution_message_size integer 16384
parallel_force_local boolean FALSE
parallel_instance_group string
parallel_io_cap_enabled boolean FALSE
parallel_max_servers integer 985
parallel_min_percent integer 0
parallel_min_servers integer 0
parallel_min_time_threshold string AUTO
parallel_server boolean TRUE
parallel_server_instances integer 2
parallel_servers_target integer 1024
parallel_threads_per_cpu integer 2
recovery_parallelism integer 0