ORA-04033 & ORA-02097 When Setting streams_pool_size

🔧 How to Fix ORA-04033 & ORA-02097 When Setting streams_pool_size in Oracle (Step-by-Step Guide)

📌 Overview

When implementing Oracle GoldenGate or Oracle Streams, it’s common to configure the streams_pool_size parameter. However, in hot implementation mode (i.e., live system without downtime), you might hit the following Oracle errors:

ORA-02097: parameter cannot be modified because specified value is invalid
ORA-04033: Insufficient memory to grow pool


This guide walks you through the root cause, diagnosis, and step-by-step resolution to successfully apply streams_pool_size=3584M on a live Oracle system, with or without a database restart.

🚨 Problem Scenario

You’re trying to apply this init parameter dynamically:

ALTER SYSTEM SET streams_pool_size=3584M SCOPE=BOTH SID='*';


But it fails with:

ORA-02097: parameter cannot be modified because specified value is invalid
ORA-04033: Insufficient memory to grow pool


This typically happens even when the SGA target is large, such as sga_target=145G.

🧠 Root Cause

Oracle cannot fulfill the memory allocation because:

• There’s not enough free dynamic memory within the sga_target.
• Other SGA pools (shared, large, java) are using up most of the space.
• Oracle is unable to shrink memory from those pools dynamically.
• You may not be using MEMORY_TARGET, hence memory reallocation is manual and static.

🔍 Step-by-Step Diagnostic Checklist

✅ 1. Check Current Free Memory in SGA

Run:

SELECT * FROM v$sga_dynamic_free_memory;


If you see something like:

CURRENT_SIZE
------------
536870912 -- Only 512 MB free


It means there’s not enough space (need ~3.5GB) to grow the streams pool.

✅ 2. Check Current Pool Allocations

SHOW PARAMETER shared_pool_size;
SHOW PARAMETER large_pool_size;
SHOW PARAMETER java_pool_size;
SHOW PARAMETER streams_pool_size;


If streams_pool_size is 0, it’s auto-managed — and forcing a large value dynamically often fails.

✅ 3. Confirm SPFILE Usage

SHOW PARAMETER spfile;

• If null → you’re using a PFILE and changes won’t persist after restart.
• If it returns a path → you’re using SPFILE (recommended).

🛠️ Resolution Options

🔄 Option 1: Apply via SPFILE + Bounce (Preferred)

1. Reduce Other Pools:

ALTER SYSTEM SET shared_pool_size=30G SCOPE=SPFILE SID='*';
ALTER SYSTEM SET large_pool_size=512M SCOPE=SPFILE SID='*'; -- adjust as per use


1. Set Streams Pool Size:

ALTER SYSTEM SET streams_pool_size=3584M SCOPE=SPFILE SID='*';


1. Restart the Database:

srvctl stop database -d dbxtrack01
srvctl start database -d dbxtrack01


🔼 Option 2: Increase sga_target and sga_max_size (if possible)

If you have more physical memory on the host oradbx-test, bump up the SGA:

ALTER SYSTEM SET sga_target=150G SCOPE=SPFILE;
ALTER SYSTEM SET sga_max_size=150G SCOPE=SPFILE;
Then restart and apply the parameter.

🚫 Option 3: Hot Mode + Shrinking Other Pools

If you must do it HOT (without restart), try this:

ALTER SYSTEM SET shared_pool_size=30G SCOPE=BOTH SID='*';
ALTER SYSTEM SET streams_pool_size=3072M SCOPE=BOTH SID='*'; -- try a bit less than 3584M


You may still fail if memory can’t be reclaimed immediately. Only use this if you can’t afford downtime.

✅ Final Check

After DB restart, confirm:

SHOW PARAMETER streams_pool_size;
-- Should show 3584M


📈 Symtoms & Scenarios:

• ORA-04033 streams_pool_size
• ORA-02097 streams pool
• Oracle streams_pool_size hot mode
• GoldenGate streams pool size
• How to set streams_pool_size in Oracle
• Oracle memory tuning streams pool

🧪 Pro Tip

Always leave 2–5 GB free dynamic SGA (i.e., don’t allocate 100% of sga_target statically) to ensure future dynamic pool resizing works without needing a bounce.

📚 Summary

Setting a large streams_pool_size like 3584M in Oracle can fail if the SGA is too full or fragmented. By using SPFILE, carefully adjusting other pool sizes, and bouncing the DB when necessary, you can reliably configure your environment — even in large-scale systems like dbxtrack01 on oradbx-test.

Author: Rohit Mishri